How to use testException method of org.assertj.core.api.WithAssertions class

Best Assertj code snippet using org.assertj.core.api.WithAssertions.testException

Source:WithAssertions.java

...2000   * Allows to capture and then assert on a {@link Throwable} (easier done with lambdas).2001   * <p>2002   * Example :2003   * <pre><code class='java'>  {@literal @}Test2004   *  public void testException() {2005   *    assertThatThrownBy(() -&gt; { throw new Exception("boom!") }).isInstanceOf(Exception.class)2006   *                                                              .hasMessageContaining("boom");2007   * }</code></pre>2008   *2009   * If the provided {@link ThrowingCallable} does not raise an exception, an error is immediately thrown,2010   * in that case the test description provided with {@link AbstractAssert#as(String, Object...) as(String, Object...)} is not honored.<br>2011   * To use a test description, use {@link #catchThrowable(ThrowableAssert.ThrowingCallable)} as shown below:2012   * <pre><code class='java'> // assertion will fail but "display me" won't appear in the error2013   * assertThatThrownBy(() -&gt; {}).as("display me")2014   *                             .isInstanceOf(Exception.class);2015   *2016   * // assertion will fail AND "display me" will appear in the error2017   * Throwable thrown = catchThrowable(() -&gt; {});2018   * assertThat(thrown).as("display me")2019   *                   .isInstanceOf(Exception.class);</code></pre>2020   * 2021   * Alternatively you can also use <code>assertThatCode(ThrowingCallable)</code> for the test description provided 2022   * with {@link AbstractAssert#as(String, Object...) as(String, Object...)} to always be honored.2023   *2024   * @param shouldRaiseThrowable The {@link ThrowingCallable} or lambda with the code that should raise the throwable.2025   * @return the created {@link ThrowableAssert}.2026   */2027  default AbstractThrowableAssert<?, ? extends Throwable> assertThatThrownBy(final ThrowingCallable shouldRaiseThrowable) {2028    return Assertions.assertThatThrownBy(shouldRaiseThrowable);2029  }2030  /**2031   * Allows to capture and then assert on a {@link Throwable} like {@code assertThatThrownBy(ThrowingCallable)} but this method 2032   * let you set the assertion description the same way you do with {@link AbstractAssert#as(String, Object...) as(String, Object...)}.2033   * <p>2034   * Example:2035   * <pre><code class='java'> {@literal @}Test2036   *  public void testException() {2037   *    // if this assertion failed (but it doesn't), the error message would start with [Test explosive code]2038   *    assertThatThrownBy(() -&gt; { throw new IOException("boom!") }, "Test explosive code")2039   *             .isInstanceOf(IOException.class)2040   *             .hasMessageContaining("boom");2041   * }</code></pre>2042   *2043   * If the provided {@link ThrowingCallable ThrowingCallable} does not raise an exception, an error is immediately thrown.2044   * <p> 2045   * The test description provided is honored but not the one with {@link AbstractAssert#as(String, Object...) as(String, Object...)}, example:2046   * <pre><code class='java'> // assertion will fail but "display me" won't appear in the error message2047   * assertThatThrownBy(() -&gt; {}).as("display me")2048   *                             .isInstanceOf(Exception.class);2049   *2050   * // assertion will fail AND "display me" will appear in the error message2051   * assertThatThrownBy(() -&gt; {}, "display me")2052   *                             .isInstanceOf(Exception.class);</code></pre>2053   *2054   * @param shouldRaiseThrowable The {@link ThrowingCallable} or lambda with the code that should raise the throwable.2055   * @param description the new description to set.2056   * @param args optional parameter if description is a format String.2057   * 2058   * @return the created {@link ThrowableAssert}.2059   * 2060   * @since 3.9.02061   */2062  default AbstractThrowableAssert<?, ? extends Throwable> assertThatThrownBy(ThrowingCallable shouldRaiseThrowable,2063                                                                             String description, Object... args) {2064    return assertThat(catchThrowable(shouldRaiseThrowable)).as(description, args).hasBeenThrown();2065  }2066  /**2067   * Allows to capture and then assert on a {@link Throwable} more easily when used with Java 8 lambdas.2068   *2069   * <p>2070   * Example :2071   * </p>2072   *2073   * <pre><code class='java'> ThrowingCallable callable = () -&gt; {2074   *   throw new Exception("boom!");2075   * };2076   * 2077   * // assertion succeeds2078   * assertThatCode(callable).isInstanceOf(Exception.class)2079   *                         .hasMessageContaining("boom");2080   *                                                      2081   * // assertion fails2082   * assertThatCode(callable).doesNotThrowAnyException();</code></pre>2083   *2084   * If the provided {@link ThrowingCallable} does not validate against next assertions, an error is immediately raised,2085   * in that case the test description provided with {@link AbstractAssert#as(String, Object...) as(String, Object...)} is not honored.<br>2086   * To use a test description, use {@link #catchThrowable(ThrowableAssert.ThrowingCallable)} as shown below.2087   * 2088   * <pre><code class='java'> ThrowingCallable doNothing = () -&gt; {2089   *   // do nothing 2090   * }; 2091   * 2092   * // assertion fails and "display me" appears in the assertion error2093   * assertThatCode(doNothing).as("display me")2094   *                          .isInstanceOf(Exception.class);2095   *2096   * // assertion will fail AND "display me" will appear in the error2097   * Throwable thrown = catchThrowable(doNothing);2098   * assertThatCode(thrown).as("display me")2099   *                       .isInstanceOf(Exception.class); </code></pre>2100   * <p>2101   * This method was not named {@code assertThat} because the java compiler reported it ambiguous when used directly with a lambda :(  2102   *2103   * @param shouldRaiseOrNotThrowable The {@link ThrowingCallable} or lambda with the code that should raise the throwable.2104   * @return The captured exception or <code>null</code> if none was raised by the callable.2105   * @since 3.7.02106   */2107  @CheckReturnValue2108  default AbstractThrowableAssert<?, ? extends Throwable> assertThatCode(ThrowingCallable shouldRaiseOrNotThrowable) {2109    return assertThat(catchThrowable(shouldRaiseOrNotThrowable));2110  }2111  /**2112   * Allows to catch an {@link Throwable} more easily when used with Java 8 lambdas.2113   *2114   * <p>2115   * This caught {@link Throwable} can then be asserted.2116   * </p>2117   *2118   * <p>2119   * Example:2120   * </p>2121   *2122   * <pre><code class='java'>{@literal @}Test2123   * public void testException() {2124   *   // when2125   *   Throwable thrown = catchThrowable(() -&gt; { throw new Exception("boom!"); });2126   *2127   *   // then2128   *   assertThat(thrown).isInstanceOf(Exception.class)2129   *                     .hasMessageContaining("boom");2130   * } </code></pre>2131   *2132   * @param shouldRaiseThrowable The lambda with the code that should raise the exception.2133   * @return The captured exception or <code>null</code> if none was raised by the callable.2134   * @see #catchThrowableOfType(ThrowingCallable, Class)2135   */2136  default Throwable catchThrowable(final ThrowingCallable shouldRaiseThrowable) {2137    return Assertions.catchThrowable(shouldRaiseThrowable);...

testException

Using AI Code Generation

1import org.assertj.core.api.WithAssertions;2import org.junit.Test;3import java.io.IOException;4import java.util.NoSuchElementException;5class TestException {6    public void testException() {7        WithAssertions test = new WithAssertions() {};8        test.assertThatThrownBy(() -> {9            throw new NoSuchElementException("No value present");10        }).isInstanceOf(NoSuchElementException.class)11                .hasMessageContaining("value");12    }13}14Using assertThrows() method15The assertThrows() method of the org.junit.jupiter.api.Assertions class is used to test the exception. The assertThrows() method takes the following arguments:16The following code shows how to use the assertThrows() method to test the exception:17import org.junit.jupiter.api.Assertions;18import org.junit.jupiter.api.Test;19import java.util.NoSuchElementException;20class TestException {21    public void testException() {22        Assertions.assertThrows(NoSuchElementException.class, () -> {23            throw new NoSuchElementException("No value present");24        }, "No value present");25    }26}27Using assertThrows() method of org.assertj.core.api.Assertions class28The assertThrows() method of the org.assertj.core.api.Assertions class is used to test the exception. The assertThrows() method takes the following arguments:29The following code shows how to use the assertThrows() method of the org.assertj.core.api.Assertions class to test the exception:

testException

Using AI Code Generation

1public void testException() {2  assertThatThrownBy(() -> {3    throw new IllegalArgumentException("a message");4  }).isInstanceOf(IllegalArgumentException.class)5    .hasMessage("a message");6}7public void testException() {8  assertThatThrownBy(() -> {9    throw new IllegalArgumentException("a message");10  }).isInstanceOf(IllegalArgumentException.class)11    .hasMessage("a message");12}13public void testException() {14  IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {15    throw new IllegalArgumentException("a message");16  });17  assertEquals("a message", exception.getMessage());18}19public void testException() {20  IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {21    throw new IllegalArgumentException("a message");22  });23  assertEquals("a message", exception.getMessage());24}25public void testException() {26  IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {27    throw new IllegalArgumentException("a message");28  });29  assertEquals("a message", exception.getMessage());30}31public void testException() {32  IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {33    throw new IllegalArgumentException("a message");34  });35  assertEquals("a message", exception.getMessage());36}37public void testException() {38  IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {

testException

Using AI Code Generation

1@DisplayName("Test Exception")2{3    @DisplayName("Test Exception Message")4    void testExceptionMessage()5    {6        Exception exception = assertThrows(IllegalArgumentException.class, () -> {7            throw new IllegalArgumentException("a message");8        });9        assertEquals("a message", exception.getMessage());10    }11    @DisplayName("Test Exception Type")12    void testExceptionType()13    {14        Exception exception = assertThrows(IllegalArgumentException.class, () -> {15            throw new IllegalArgumentException("a message");16        });17        assertEquals(IllegalArgumentException.class, exception.getClass());18    }19    @DisplayName("Test Exception Message and Type")20    void testExceptionMessageAndType()21    {22        Exception exception = assertThrows(IllegalArgumentException.class, () -> {23            throw new IllegalArgumentException("a message");24        });25        assertEquals("a message", exception.getMessage());26        assertEquals(IllegalArgumentException.class, exception.getClass());27    }28    @DisplayName("Test Exception Message with Lambda Expression")29    void testExceptionMessageWithLambdaExpression()30    {31        assertThatThrownBy(() -> {32            throw new IllegalArgumentException("a message");33        }).isInstanceOf(IllegalArgumentException.class)34                .hasMessageContaining("a message");35    }36}

testException

Using AI Code Generation

1@DisplayName("Test Exception")2{3    @DisplayName("Test Exception Message")4    void testExceptionMessage()5    {6        Exception exception = assertThrows(IllegalArgumentException.class, () -> {7            throw new IllegalArgumentException("a message");8        });9        assertEquals("a message", exception.getMessage());10    }11    @DisplayName("Test Exception Type")12    void testExceptionType()13    {14        Exception exception = assertThrows(IllegalArgumentException.class, () -> {15            throw new IllegalArgumentException("a message");16        });17        assertEquals(IllegalArgumentException.class, exception.getClass());18    }19    @DisplayName("Test Exception Message and Type")20    void testExceptionMessageAndType()21    {22        Exception exception = assertThrows(IllegalArgumentException.class, () -> {23            throw new IllegalArgumentException("a message");24        });25        assertEquals("a message", exception.getMessage());26        assertEquals(IllegalArgumentException.class, exception.getClass());27    }28    @DisplayName("Test Exception Message with Lambda Expression")29    void testExceptionMessageWithLambdaExpression()30    {31        assertThatThrownBy(() -> {32            throw new IllegalArgumentException("a message");33        }).isInstanceOf(IllegalArgumentException.class)34                .hasMessageContaining("a message");35    }36}

testException

Using AI Code Generation

1    @DisplayName("Test Exception Message")2    void testExceptionMessage()3    {4        Exception exception = assertThrows(IllegalArgumentException.class, () -> {5            throw new IllegalArgumentException("a message");6        });7        assertEquals("a message", exception.getMessage());8    }9    @DisplayName("Test Exception Type")10    void testExceptionType()11    {12        Exception exception = assertThrows(IllegalArgumentException.class, () -> {13            throw new IllegalArgumentException("a message");14        });15        assertEquals(IllegalArgumentException.class, exception.getClass());16    }17    @DisplayName("Test Exception Message and Type")18    void testExceptionMessageAndType()19    {20        Exception exception = assertThrows(IllegalArgumentException.class, () -> {21            throw new IllegalArgumentException("a message");22        });23        assertEquals("a message", exception.getMessage());24        assertEquals(IllegalArgumentException.class, exception.getClass());25    }26    @DisplayName("Test Exception Message with Lambda Expression")27    void testExceptionMessageWithLambdaExpression()28    {29        assertThatThrownBy(() -> {30            throw new IllegalArgumentException("a message");31        }).isInstanceOf(IllegalArgumentException.class)32                .hasMessageContaining("a message");33    }34}

testException

Using AI Code Generation

1@DisplayName("Test Exception")2{3    @DisplayName("Test Exception Message")4    void testExceptionMessage()5    {6        Exception exception = assertThrows(IllegalArgumentException.class, () -> {7            throw new IllegalArgumentException("a message");8        });9        assertEquals("a message", exception.getMessage());10    }11    @DisplayName("Test Exception Type")12    void testExceptionType()13    {14        Exception exception = assertThrows(IllegalArgumentException.class, () -> {15            throw new IllegalArgumentException("a message");16        });17        assertEquals(IllegalArgumentException.class, exception.getClass());18    }19    @DisplayName("Test Exception Message and Type")20    void testExceptionMessageAndType()21    {22        Exception exception = assertThrows(IllegalArgumentException.class, () -> {23            throw new IllegalArgumentException("a message");24        });25        assertEquals("a message", exception.getMessage());26        assertEquals(IllegalArgumentException.class, exception.getClass());27    }28    @DisplayName("Test Exception Message with Lambda Expression")29    void testExceptionMessageWithLambdaExpression()30    {31        assertThatThrownBy(() -> {32            throw new IllegalArgumentException("a message");33        }).isInstanceOf(IllegalArgumentException.class)34                .hasMessageContaining("a message");35    }36}

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