Java 12 String API Test
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package com.baeldung;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.MatcherAssert.assertThat;
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import org.junit.Test;
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public class StringAPITest {
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@Test
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public void whenPositiveArgument_thenReturnIndentedString() {
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String multilineStr = "This is\na multiline\nstring.";
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String outputStr = " This is\n a multiline\n string.\n";
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String postIndent = multilineStr.indent(3);
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assertThat(outputStr, equalTo(postIndent));
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}
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@Test
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public void whenNegativeArgument_thenReturnReducedIndentedString() {
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String multilineStr = " This is\n a multiline\n string.";
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String outputStr = " This is\n a multiline\n string.\n";
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String postIndent = multilineStr.indent(-2);
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assertThat(outputStr, equalTo(postIndent));
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}
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@Test
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public void whenTransformUsingLamda_thenReturnTransformedString() {
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String result = "hello".transform(input -> input + " world!");
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assertThat("hello world!", equalTo(result));
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}
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@Test
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public void whenTransformUsingParseInt_thenReturnInt() {
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int result = "42".transform(Integer::parseInt);
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assertThat(42, equalTo(result));
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}
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}
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