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Java 8 AssertJ 的异常（Exception ）断言

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This commit is contained in:
YuCheng Hu 2022-06-06 12:26:06 -04:00
parent 56c352b6f6
commit 550291e2e0
2 changed files with 20 additions and 18 deletions
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2
testing-modules/assertion-libraries/README.md
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@ -7,8 +7,6 @@
如果计算结果为 false ，则断言失败，抛出 AssertionError。 如果计算结果为 false ，则断言失败，抛出 AssertionError。
assertion(断言) 在软件开发中是一种常用的调试方式，很多开发语言中都支持这种机制。
### 相关文章 ### 相关文章
- [AssertJ’s Java 8 Features](http://www.baeldung.com/assertJ-java-8-features) - [AssertJ’s Java 8 Features](http://www.baeldung.com/assertJ-java-8-features)

36
testing-modules/assertion-libraries/src/test/java/com/ossez/assertj/exceptions/Java8StyleAssertions.java
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@ -8,8 +8,15 @@ import static org.assertj.core.api.Assertions.catchThrowable;
import java.io.IOException; import java.io.IOException;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.Arrays; import java.util.Arrays;
import org.junit.Test; import org.junit.Test;
/**
* AssertJ Exception example
* <p><a href="https://www.ossez.com/t/assertj-exception/13988">https://www.ossez.com/t/assertj-exception/13988</a></p>
*
* @author YuCheng Hu
*/
public class Java8StyleAssertions { public class Java8StyleAssertions {
@Test @Test
@ -18,13 +25,11 @@ public class Java8StyleAssertions {
ArrayList<String> myStringList = new ArrayList<String>(Arrays.asList("Strine one", "String two")); ArrayList<String> myStringList = new ArrayList<String>(Arrays.asList("Strine one", "String two"));
myStringList.get(2); myStringList.get(2);
}).isInstanceOf(IndexOutOfBoundsException.class) }).isInstanceOf(IndexOutOfBoundsException.class)
.hasMessageStartingWith("Index: 2") .hasMessageStartingWith("Index 2")
.hasMessageContaining("2") .hasMessageContaining("2")
.hasMessageEndingWith("Size: 2") .hasMessageEndingWith("length 2")
.hasMessageContaining("Index: 2, Size: 2") .hasMessageContaining("Index 2")
.hasMessage("Index: %s, Size: %s", 2, 2) .hasNoCause();
.hasMessageMatching("Index: \\d+, Size: \\d+")
.hasNoCause();
} }
@Test @Test
@ -36,18 +41,18 @@ public class Java8StyleAssertions {
throw new RuntimeException(e); throw new RuntimeException(e);
} }
}).isInstanceOf(RuntimeException.class) }).isInstanceOf(RuntimeException.class)
.hasCauseInstanceOf(IOException.class) .hasCauseInstanceOf(IOException.class)
.hasStackTraceContaining("IOException"); .hasStackTraceContaining("IOException");
} }
@Test @Test
public void whenDividingByZero_thenArithmeticException() { public void whenDividingByZero_thenArithmeticException() {
assertThatExceptionOfType(ArithmeticException.class).isThrownBy(() -> { assertThatExceptionOfType(ArithmeticException.class).isThrownBy(() -> {
int numerator = 10; int numerator = 10;
int denominator = 0; int denominator = 0;
int quotient = numerator / denominator; int quotient = numerator / denominator;
}) })
.withMessageContaining("/ by zero"); .withMessageContaining("/ by zero");
// Alternatively: // Alternatively:
@ -60,7 +65,6 @@ public class Java8StyleAssertions {
// then // then
assertThat(thrown).isInstanceOf(ArithmeticException.class) assertThat(thrown).isInstanceOf(ArithmeticException.class)
.hasMessageContaining("/ by zero"); .hasMessageContaining("/ by zero");
} }
} }