/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.text;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.fail;

import java.text.DecimalFormatSymbols;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;

import org.apache.commons.lang3.ArrayUtils;
import org.junit.jupiter.api.Test;

/**
 * Tests {@link StrBuilder}.
 *
 * @deprecated This class will be removed in 2.0.
 */
@Deprecated
class StrBuilderAppendInsertTest {

    /** The system line separator. */
    private static final String SEP = System.lineSeparator();

    /** Test subclass of Object, with a toString method. */
    private static final Object FOO = new Object() {
        @Override
        public String toString() {
            return "foo";
        }
    };

    @Test
    void testAppend_Boolean() {
        final StrBuilder sb = new StrBuilder();
        sb.append(true);
        assertEquals("true", sb.toString());

        sb.append(false);
        assertEquals("truefalse", sb.toString());

        sb.append('!');
        assertEquals("truefalse!", sb.toString());
    }

    @Test
    void testAppend_CharArray() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((char[]) null);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(ArrayUtils.EMPTY_CHAR_ARRAY);
        assertEquals("", sb.toString());

        sb.append(new char[] { 'f', 'o', 'o' });
        assertEquals("foo", sb.toString());
    }

    @Test
    void testAppend_CharArray_int_int() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((char[]) null, 0, 1);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new char[] { 'f', 'o', 'o' }, 0, 3);
        assertEquals("foo", sb.toString());

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, -1, 1);
            fail("append(char[], -1,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, 3, 1);
            fail("append(char[], 3,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, 1, -1);
            fail("append(char[],, -1) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, 1, 3);
            fail("append(char[], 1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, -1, 3);
            fail("append(char[], -1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new char[] { 'b', 'a', 'r' }, 4, 0);
            fail("append(char[], 4, 0) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        sb.append(new char[] { 'b', 'a', 'r' }, 3, 0);
        assertEquals("foo", sb.toString());

        sb.append(new char[] { 'a', 'b', 'c', 'b', 'a', 'r', 'd', 'e', 'f' }, 3, 3);
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_FormattedString() {
        StrBuilder sb;

        sb = new StrBuilder();
        sb.append("Hi", (Object[]) null);
        assertEquals("Hi", sb.toString());

        sb = new StrBuilder();
        sb.append("Hi", "Alice");
        assertEquals("Hi", sb.toString());

        sb = new StrBuilder();
        sb.append("Hi %s", "Alice");
        assertEquals("Hi Alice", sb.toString());

        sb = new StrBuilder();
        sb.append("Hi %s %,d", "Alice", 5000);
        // group separator depends on system locale
        final char groupingSeparator = DecimalFormatSymbols.getInstance().getGroupingSeparator();
        final String expected = "Hi Alice 5" + groupingSeparator + "000";
        assertEquals(expected, sb.toString());
    }

    @Test
    void testAppend_Object() {
        final StrBuilder sb = new StrBuilder();
        sb.appendNull();
        assertEquals("", sb.toString());

        sb.append((Object) null);
        assertEquals("", sb.toString());

        sb.append(FOO);
        assertEquals("foo", sb.toString());

        sb.append((StringBuffer) null);
        assertEquals("foo", sb.toString());

        sb.append(new StringBuffer("baz"));
        assertEquals("foobaz", sb.toString());

        sb.append(new StrBuilder("yes"));
        assertEquals("foobazyes", sb.toString());

        sb.append((CharSequence) "Seq");
        assertEquals("foobazyesSeq", sb.toString());

        sb.append(new StringBuilder("bld")); // Check it supports StringBuilder
        assertEquals("foobazyesSeqbld", sb.toString());
    }

    @Test
    void testAppend_PrimitiveNumber() {
        final StrBuilder sb = new StrBuilder();
        sb.append(0);
        assertEquals("0", sb.toString());

        sb.append(1L);
        assertEquals("01", sb.toString());

        sb.append(2.3f);
        assertEquals("012.3", sb.toString());

        sb.append(4.5d);
        assertEquals("012.34.5", sb.toString());
    }

    @Test
    void testAppend_StrBuilder() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((StrBuilder) null);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StrBuilder("foo"));
        assertEquals("foo", sb.toString());

        sb.append(new StrBuilder(""));
        assertEquals("foo", sb.toString());

        sb.append(new StrBuilder("bar"));
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_StrBuilder_int_int() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((StrBuilder) null, 0, 1);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StrBuilder("foo"), 0, 3);
        assertEquals("foo", sb.toString());

        try {
            sb.append(new StrBuilder("bar"), -1, 1);
            fail("append(char[], -1,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StrBuilder("bar"), 3, 1);
            fail("append(char[], 3,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StrBuilder("bar"), 1, -1);
            fail("append(char[],, -1) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StrBuilder("bar"), 1, 3);
            fail("append(char[], 1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StrBuilder("bar"), -1, 3);
            fail("append(char[], -1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StrBuilder("bar"), 4, 0);
            fail("append(char[], 4, 0) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        sb.append(new StrBuilder("bar"), 3, 0);
        assertEquals("foo", sb.toString());

        sb.append(new StrBuilder("abcbardef"), 3, 3);
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_String() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((String) null);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append("foo");
        assertEquals("foo", sb.toString());

        sb.append("");
        assertEquals("foo", sb.toString());

        sb.append("bar");
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_String_int_int() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((String) null, 0, 1);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append("foo", 0, 3);
        assertEquals("foo", sb.toString());

        try {
            sb.append("bar", -1, 1);
            fail("append(char[], -1,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append("bar", 3, 1);
            fail("append(char[], 3,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append("bar", 1, -1);
            fail("append(char[],, -1) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append("bar", 1, 3);
            fail("append(char[], 1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append("bar", -1, 3);
            fail("append(char[], -1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append("bar", 4, 0);
            fail("append(char[], 4, 0) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        sb.append("bar", 3, 0);
        assertEquals("foo", sb.toString());

        sb.append("abcbardef", 3, 3);
        assertEquals("foobar", sb.toString());

        sb.append((CharSequence) "abcbardef", 4, 3);
        assertEquals("foobarard", sb.toString());
    }

    @Test
    void testAppend_StringBuffer() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((StringBuffer) null);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StringBuffer("foo"));
        assertEquals("foo", sb.toString());

        sb.append(new StringBuffer(""));
        assertEquals("foo", sb.toString());

        sb.append(new StringBuffer("bar"));
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_StringBuffer_int_int() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((StringBuffer) null, 0, 1);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StringBuffer("foo"), 0, 3);
        assertEquals("foo", sb.toString());

        try {
            sb.append(new StringBuffer("bar"), -1, 1);
            fail("append(char[], -1,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuffer("bar"), 3, 1);
            fail("append(char[], 3,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuffer("bar"), 1, -1);
            fail("append(char[],, -1) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuffer("bar"), 1, 3);
            fail("append(char[], 1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuffer("bar"), -1, 3);
            fail("append(char[], -1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuffer("bar"), 4, 0);
            fail("append(char[], 4, 0) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        sb.append(new StringBuffer("bar"), 3, 0);
        assertEquals("foo", sb.toString());

        sb.append(new StringBuffer("abcbardef"), 3, 3);
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_StringBuilder() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((String) null);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StringBuilder("foo"));
        assertEquals("foo", sb.toString());

        sb.append(new StringBuilder(""));
        assertEquals("foo", sb.toString());

        sb.append(new StringBuilder("bar"));
        assertEquals("foobar", sb.toString());
    }

    @Test
    void testAppend_StringBuilder_int_int() {
        StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL").append((String) null, 0, 1);
        assertEquals("NULL", sb.toString());

        sb = new StrBuilder();
        sb.append(new StringBuilder("foo"), 0, 3);
        assertEquals("foo", sb.toString());

        try {
            sb.append(new StringBuilder("bar"), -1, 1);
            fail("append(StringBuilder, -1,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuilder("bar"), 3, 1);
            fail("append(StringBuilder, 3,) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuilder("bar"), 1, -1);
            fail("append(StringBuilder,, -1) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuilder("bar"), 1, 3);
            fail("append(StringBuilder, 1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuilder("bar"), -1, 3);
            fail("append(StringBuilder, -1, 3) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        try {
            sb.append(new StringBuilder("bar"), 4, 0);
            fail("append(StringBuilder, 4, 0) expected IndexOutOfBoundsException");
        } catch (final IndexOutOfBoundsException e) {
            // expected
        }

        sb.append(new StringBuilder("bar"), 3, 0);
        assertEquals("foo", sb.toString());

        sb.append(new StringBuilder("abcbardef"), 3, 3);
        assertEquals("foobar", sb.toString());

        sb.append(new StringBuilder("abcbardef"), 4, 3);
        assertEquals("foobarard", sb.toString());
    }

    @Test
    void testAppendAll_Array() {
        final StrBuilder sb = new StrBuilder();
        sb.appendAll((Object[]) null);
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll();
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll("foo", "bar", "baz");
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.appendAll("foo", "bar", "baz");
        assertEquals("foobarbaz", sb.toString());
    }

    @Test
    void testAppendAll_Collection() {
        final StrBuilder sb = new StrBuilder();
        sb.appendAll((Collection<?>) null);
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll(Collections.EMPTY_LIST);
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll(Arrays.asList("foo", "bar", "baz"));
        assertEquals("foobarbaz", sb.toString());
    }

    @Test
    void testAppendAll_Iterator() {
        final StrBuilder sb = new StrBuilder();
        sb.appendAll((Iterator<?>) null);
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll(Collections.EMPTY_LIST.iterator());
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendAll(Arrays.asList("foo", "bar", "baz").iterator());
        assertEquals("foobarbaz", sb.toString());
    }

    @Test
    void testAppendFixedWidthPadLeft() {
        final StrBuilder sb = new StrBuilder();
        sb.appendFixedWidthPadLeft("foo", -1, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 0, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 1, '-');
        assertEquals("o", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 2, '-');
        assertEquals("oo", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 3, '-');
        assertEquals("foo", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 4, '-');
        assertEquals("-foo", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft("foo", 10, '-');
        assertEquals(10, sb.length());
        // 1234567890
        assertEquals("-------foo", sb.toString());

        sb.clear();
        sb.setNullText("null");
        sb.appendFixedWidthPadLeft(null, 5, '-');
        assertEquals("-null", sb.toString());
    }

    @Test
    void testAppendFixedWidthPadLeft_int() {
        final StrBuilder sb = new StrBuilder();
        sb.appendFixedWidthPadLeft(123, -1, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 0, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 1, '-');
        assertEquals("3", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 2, '-');
        assertEquals("23", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 3, '-');
        assertEquals("123", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 4, '-');
        assertEquals("-123", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadLeft(123, 10, '-');
        assertEquals(10, sb.length());
        // 1234567890
        assertEquals("-------123", sb.toString());
    }

    @Test
    void testAppendFixedWidthPadRight() {
        final StrBuilder sb = new StrBuilder();
        sb.appendFixedWidthPadRight("foo", -1, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 0, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 1, '-');
        assertEquals("f", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 2, '-');
        assertEquals("fo", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 3, '-');
        assertEquals("foo", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 4, '-');
        assertEquals("foo-", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight("foo", 10, '-');
        assertEquals(10, sb.length());
        // 1234567890
        assertEquals("foo-------", sb.toString());

        sb.clear();
        sb.setNullText("null");
        sb.appendFixedWidthPadRight(null, 5, '-');
        assertEquals("null-", sb.toString());
    }

    @Test
    void testAppendFixedWidthPadRight_int() {
        final StrBuilder sb = new StrBuilder();
        sb.appendFixedWidthPadRight(123, -1, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 0, '-');
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 1, '-');
        assertEquals("1", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 2, '-');
        assertEquals("12", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 3, '-');
        assertEquals("123", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 4, '-');
        assertEquals("123-", sb.toString());

        sb.clear();
        sb.appendFixedWidthPadRight(123, 10, '-');
        assertEquals(10, sb.length());
        // 1234567890
        assertEquals("123-------", sb.toString());
    }

    @Test
    void testAppendln_Boolean() {
        final StrBuilder sb = new StrBuilder();
        sb.appendln(true);
        assertEquals("true" + SEP, sb.toString());

        sb.clear();
        sb.appendln(false);
        assertEquals("false" + SEP, sb.toString());
    }

    @Test
    void testAppendln_CharArray() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final char[] str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln("foo".toCharArray());
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_CharArray_int_int() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final char[] str, final int startIndex, final int length) {
                count[0]++;
                return super.append(str, startIndex, length);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln("foo".toCharArray(), 0, 3);
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_FormattedString() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final String str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln("Hello %s", "Alice");
        assertEquals("Hello Alice" + SEP, sb.toString());
        assertEquals(2, count[0]); // appendNewLine() calls append(String)
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_Object() {
        final StrBuilder sb = new StrBuilder();
        sb.appendln((Object) null);
        assertEquals("" + SEP, sb.toString());

        sb.appendln(FOO);
        assertEquals(SEP + "foo" + SEP, sb.toString());

        sb.appendln(Integer.valueOf(6));
        assertEquals(SEP + "foo" + SEP + "6" + SEP, sb.toString());
    }

    @Test
    void testAppendln_PrimitiveNumber() {
        final StrBuilder sb = new StrBuilder();
        sb.appendln(0);
        assertEquals("0" + SEP, sb.toString());

        sb.clear();
        sb.appendln(1L);
        assertEquals("1" + SEP, sb.toString());

        sb.clear();
        sb.appendln(2.3f);
        assertEquals("2.3" + SEP, sb.toString());

        sb.clear();
        sb.appendln(4.5d);
        assertEquals("4.5" + SEP, sb.toString());
    }

    @Test
    void testAppendln_StrBuilder() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StrBuilder str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StrBuilder("foo"));
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_StrBuilder_int_int() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StrBuilder str, final int startIndex, final int length) {
                count[0]++;
                return super.append(str, startIndex, length);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StrBuilder("foo"), 0, 3);
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_String() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final String str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln("foo");
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(2, count[0]); // appendNewLine() calls append(String)
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_String_int_int() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final String str, final int startIndex, final int length) {
                count[0]++;
                return super.append(str, startIndex, length);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln("foo", 0, 3);
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_StringBuffer() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StringBuffer str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StringBuffer("foo"));
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_StringBuffer_int_int() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StringBuffer str, final int startIndex, final int length) {
                count[0]++;
                return super.append(str, startIndex, length);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StringBuffer("foo"), 0, 3);
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_StringBuilder() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StringBuilder str) {
                count[0]++;
                return super.append(str);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StringBuilder("foo"));
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendln_StringBuilder_int_int() {
        final int[] count = new int[2];
        final StrBuilder sb = new StrBuilder() {
            private static final long serialVersionUID = 1L;

            @Override
            public StrBuilder append(final StringBuilder str, final int startIndex, final int length) {
                count[0]++;
                return super.append(str, startIndex, length);
            }

            @Override
            public StrBuilder appendNewLine() {
                count[1]++;
                return super.appendNewLine();
            }
        };
        sb.appendln(new StringBuilder("foo"), 0, 3);
        assertEquals("foo" + SEP, sb.toString());
        assertEquals(1, count[0]);
        assertEquals(1, count[1]);
    }

    @Test
    void testAppendNewLine() {
        StrBuilder sb = new StrBuilder("---");
        sb.appendNewLine().append("+++");
        assertEquals("---" + SEP + "+++", sb.toString());

        sb = new StrBuilder("---");
        sb.setNewLineText("#").appendNewLine().setNewLineText(null).appendNewLine();
        assertEquals("---#" + SEP, sb.toString());
    }

    @Test
    void testAppendPadding() {
        final StrBuilder sb = new StrBuilder();
        sb.append("foo");
        assertEquals("foo", sb.toString());

        sb.appendPadding(-1, '-');
        assertEquals("foo", sb.toString());

        sb.appendPadding(0, '-');
        assertEquals("foo", sb.toString());

        sb.appendPadding(1, '-');
        assertEquals("foo-", sb.toString());

        sb.appendPadding(16, '-');
        assertEquals(20, sb.length());
        // 12345678901234567890
        assertEquals("foo-----------------", sb.toString());
    }

    @Test
    void testAppendSeparator_char() {
        final StrBuilder sb = new StrBuilder();
        sb.appendSeparator(','); // no effect
        assertEquals("", sb.toString());
        sb.append("foo");
        assertEquals("foo", sb.toString());
        sb.appendSeparator(',');
        assertEquals("foo,", sb.toString());
    }

    @Test
    void testAppendSeparator_char_char() {
        final StrBuilder sb = new StrBuilder();
        final char startSeparator = ':';
        final char standardSeparator = ',';
        final String foo = "foo";
        sb.appendSeparator(standardSeparator, startSeparator); // no effect
        assertEquals(String.valueOf(startSeparator), sb.toString());
        sb.append(foo);
        assertEquals(String.valueOf(startSeparator) + foo, sb.toString());
        sb.appendSeparator(standardSeparator, startSeparator);
        assertEquals(String.valueOf(startSeparator) + foo + standardSeparator, sb.toString());
    }

    @Test
    void testAppendSeparator_char_int() {
        final StrBuilder sb = new StrBuilder();
        sb.appendSeparator(',', 0); // no effect
        assertEquals("", sb.toString());
        sb.append("foo");
        assertEquals("foo", sb.toString());
        sb.appendSeparator(',', 1);
        assertEquals("foo,", sb.toString());

        sb.appendSeparator(',', -1); // no effect
        assertEquals("foo,", sb.toString());
    }

    @Test
    void testAppendSeparator_String() {
        final StrBuilder sb = new StrBuilder();
        sb.appendSeparator(","); // no effect
        assertEquals("", sb.toString());
        sb.append("foo");
        assertEquals("foo", sb.toString());
        sb.appendSeparator(",");
        assertEquals("foo,", sb.toString());
    }

    @Test
    void testAppendSeparator_String_int() {
        final StrBuilder sb = new StrBuilder();
        sb.appendSeparator(",", 0); // no effect
        assertEquals("", sb.toString());
        sb.append("foo");
        assertEquals("foo", sb.toString());
        sb.appendSeparator(",", 1);
        assertEquals("foo,", sb.toString());

        sb.appendSeparator(",", -1); // no effect
        assertEquals("foo,", sb.toString());
    }

    @Test
    void testAppendSeparator_String_String() {
        final StrBuilder sb = new StrBuilder();
        final String startSeparator = "order by ";
        final String standardSeparator = ",";
        final String foo = "foo";
        sb.appendSeparator(null, null);
        assertEquals("", sb.toString());
        sb.appendSeparator(standardSeparator, null);
        assertEquals("", sb.toString());
        sb.appendSeparator(standardSeparator, startSeparator);
        assertEquals(startSeparator, sb.toString());
        sb.appendSeparator(null, null);
        assertEquals(startSeparator, sb.toString());
        sb.appendSeparator(null, startSeparator);
        assertEquals(startSeparator, sb.toString());
        sb.append(foo);
        assertEquals(startSeparator + foo, sb.toString());
        sb.appendSeparator(standardSeparator, startSeparator);
        assertEquals(startSeparator + foo + standardSeparator, sb.toString());
    }

    @Test
    void testAppendWithNullText() {
        final StrBuilder sb = new StrBuilder();
        sb.setNullText("NULL");
        assertEquals("", sb.toString());

        sb.appendNull();
        assertEquals("NULL", sb.toString());

        sb.append((Object) null);
        assertEquals("NULLNULL", sb.toString());

        sb.append(FOO);
        assertEquals("NULLNULLfoo", sb.toString());

        sb.append((String) null);
        assertEquals("NULLNULLfooNULL", sb.toString());

        sb.append("");
        assertEquals("NULLNULLfooNULL", sb.toString());

        sb.append("bar");
        assertEquals("NULLNULLfooNULLbar", sb.toString());

        sb.append((StringBuffer) null);
        assertEquals("NULLNULLfooNULLbarNULL", sb.toString());

        sb.append(new StringBuffer("baz"));
        assertEquals("NULLNULLfooNULLbarNULLbaz", sb.toString());
    }

    @Test
    void testAppendWithSeparators_Array() {
        final StrBuilder sb = new StrBuilder();
        sb.appendWithSeparators((Object[]) null, ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(ArrayUtils.EMPTY_OBJECT_ARRAY, ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(new Object[] { "foo", "bar", "baz" }, ",");
        assertEquals("foo,bar,baz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(new Object[] { "foo", "bar", "baz" }, null);
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(new Object[] { "foo", null, "baz" }, ",");
        assertEquals("foo,,baz", sb.toString());
    }

    @Test
    void testAppendWithSeparators_Collection() {
        final StrBuilder sb = new StrBuilder();
        sb.appendWithSeparators((Collection<?>) null, ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Collections.EMPTY_LIST, ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", "bar", "baz"), ",");
        assertEquals("foo,bar,baz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", "bar", "baz"), null);
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", null, "baz"), ",");
        assertEquals("foo,,baz", sb.toString());
    }

    @Test
    void testAppendWithSeparators_Iterator() {
        final StrBuilder sb = new StrBuilder();
        sb.appendWithSeparators((Iterator<?>) null, ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Collections.EMPTY_LIST.iterator(), ",");
        assertEquals("", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", "bar", "baz").iterator(), ",");
        assertEquals("foo,bar,baz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", "bar", "baz").iterator(), null);
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", null, "baz").iterator(), ",");
        assertEquals("foo,,baz", sb.toString());
    }

    @Test
    void testAppendWithSeparatorsWithNullText() {
        final StrBuilder sb = new StrBuilder();
        sb.setNullText("null");
        sb.appendWithSeparators(new Object[] { "foo", null, "baz" }, ",");
        assertEquals("foo,null,baz", sb.toString());

        sb.clear();
        sb.appendWithSeparators(Arrays.asList("foo", null, "baz"), ",");
        assertEquals("foo,null,baz", sb.toString());
    }

    @Test
    void testInsert() {

        final StrBuilder sb = new StrBuilder();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, FOO));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, FOO));

        sb.insert(0, (Object) null);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, FOO);
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, "foo"));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, "foo"));

        sb.insert(0, (String) null);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, "foo");
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, new char[] { 'f', 'o', 'o' }));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, new char[] { 'f', 'o', 'o' }));

        sb.insert(0, (char[]) null);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, ArrayUtils.EMPTY_CHAR_ARRAY);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, new char[] { 'f', 'o', 'o' });
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 3, 3));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 3, 3));

        sb.insert(0, (char[]) null, 0, 0);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, ArrayUtils.EMPTY_CHAR_ARRAY, 0, 0);
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, -1, 3));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 10, 3));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 0, -1));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 0, 10));

        sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 0, 0);
        assertEquals("barbaz", sb.toString());

        sb.insert(0, new char[] { 'a', 'b', 'c', 'f', 'o', 'o', 'd', 'e', 'f' }, 3, 3);
        assertEquals("foobarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, true));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, true));

        sb.insert(0, true);
        assertEquals("truebarbaz", sb.toString());

        sb.insert(0, false);
        assertEquals("falsetruebarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, '!'));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, '!'));

        sb.insert(0, '!');
        assertEquals("!barbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, 0));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, 0));

        sb.insert(0, '0');
        assertEquals("0barbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, 1L));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, 1L));

        sb.insert(0, 1L);
        assertEquals("1barbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, 2.3F));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, 2.3F));

        sb.insert(0, 2.3F);
        assertEquals("2.3barbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, 4.5D));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, 4.5D));

        sb.insert(0, 4.5D);
        assertEquals("4.5barbaz", sb.toString());
    }

    @Test
    void testInsertWithNullText() {
        final StrBuilder sb = new StrBuilder();
        sb.setNullText("null");
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, FOO));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, FOO));

        sb.insert(0, (Object) null);
        assertEquals("nullbarbaz", sb.toString());

        sb.insert(0, FOO);
        assertEquals("foonullbarbaz", sb.toString());

        sb.clear();
        sb.append("barbaz");
        assertEquals("barbaz", sb.toString());

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(-1, "foo"));

        assertThrows(IndexOutOfBoundsException.class, () -> sb.insert(7, "foo"));

        sb.insert(0, (String) null);
        assertEquals("nullbarbaz", sb.toString());

        sb.insert(0, "foo");
        assertEquals("foonullbarbaz", sb.toString());

        sb.insert(0, (char[]) null);
        assertEquals("nullfoonullbarbaz", sb.toString());

        sb.insert(0, (char[]) null, 0, 0);
        assertEquals("nullnullfoonullbarbaz", sb.toString());
    }

    /** See: https://issues.apache.org/jira/browse/LANG-299 */
    @Test
    void testLang299() {
        final StrBuilder sb = new StrBuilder(1);
        sb.appendFixedWidthPadRight("foo", 1, '-');
        assertEquals("f", sb.toString());
    }
}
