42 lines
1.2 KiB
Java
42 lines
1.2 KiB
Java
package com.baeldung;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.function.Executable;
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import java.util.ConcurrentModificationException;
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import java.util.HashMap;
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import java.util.Map;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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class ExceptionUnitTest {
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@Test
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void shouldThrowException() {
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Throwable exception = assertThrows(UnsupportedOperationException.class, () -> {
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throw new UnsupportedOperationException("Not supported");
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});
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assertEquals("Not supported", exception.getMessage());
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}
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@Test
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void assertThrowsException() {
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String str = null;
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assertThrows(IllegalArgumentException.class, () -> {
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Integer.valueOf(str);
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});
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}
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@Test
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void whenModifyMapDuringIteration_thenThrowExecption() {
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Map<Integer, String> hashmap = new HashMap<>();
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hashmap.put(1, "One");
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hashmap.put(2, "Two");
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Executable executable = () -> hashmap.forEach((key, value) -> hashmap.remove(1));
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assertThrows(ConcurrentModificationException.class, executable);
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}
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}
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