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Omitting common stack frames for multiple failures when using 'Expect'.
This approach uses a hacky way to omit the common stack frames by instantiating a new exception class with parallel exception as cause, re-using java.lang.Throwable.printStackTrace() to print, and then strip the leading full stack. RELNOTES=Cleaner stack trace for Expect.java ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=184702168
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159
core/src/test/java/com/google/common/truth/ExpectWithStackTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| /* | ||
| * Copyright (c) 2018 Google, Inc. | ||
| * | ||
| * Licensed 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 | ||
| * | ||
| * http://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 com.google.common.truth; | ||
|
|
||
| import static com.google.common.truth.Truth.assertThat; | ||
| import static com.google.common.truth.Truth.assertWithMessage; | ||
|
|
||
| import com.google.common.base.Predicate; | ||
| import com.google.common.base.Predicates; | ||
| import org.junit.Rule; | ||
| import org.junit.Test; | ||
| import org.junit.rules.TestRule; | ||
| import org.junit.runner.Description; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
| import org.junit.runners.model.Statement; | ||
|
|
||
| @RunWith(JUnit4.class) | ||
| public class ExpectWithStackTest { | ||
| private final Expect expectWithTrace = Expect.createAndEnableStackTrace(); | ||
|
|
||
| @Rule public final TestRuleVerifier verifyAssertionError = new TestRuleVerifier(expectWithTrace); | ||
|
|
||
| @Test | ||
| public void testExpectTrace_simpleCase() { | ||
| verifyAssertionError.setErrorVerifier( | ||
| new Predicate<AssertionError>() { | ||
| @Override | ||
| public boolean apply(AssertionError expected) { | ||
| assertThat(expected.getStackTrace()).hasLength(0); | ||
| assertThat(expected).hasMessageThat().startsWith("3 expectations failed:"); | ||
| return true; | ||
| } | ||
| }); | ||
|
|
||
| expectWithTrace.that(true).isFalse(); | ||
| expectWithTrace.that("Hello").isNull(); | ||
| expectWithTrace.that(1).isEqualTo(2); | ||
| } | ||
|
|
||
| @Test | ||
| public void testExpectTrace_loop() { | ||
| verifyAssertionError.setErrorVerifier( | ||
| new Predicate<AssertionError>() { | ||
| @Override | ||
| public boolean apply(AssertionError expected) { | ||
| assertThat(expected.getStackTrace()).hasLength(0); | ||
| assertThat(expected).hasMessageThat().startsWith("4 expectations failed:"); | ||
| assertWithMessage("test method name should only show up once with following omitted") | ||
| .that(expected.getMessage().split("testExpectTrace_loop")) | ||
| .hasLength(2); | ||
| return true; | ||
| } | ||
| }); | ||
|
|
||
| for (int i = 0; i < 4; i++) { | ||
| expectWithTrace.that(true).isFalse(); | ||
| } | ||
| } | ||
|
|
||
| @Test | ||
| public void testExpectTrace_callerException() { | ||
| verifyAssertionError.setErrorVerifier( | ||
| new Predicate<AssertionError>() { | ||
| @Override | ||
| public boolean apply(AssertionError expected) { | ||
| assertThat(expected.getStackTrace()).hasLength(0); | ||
| assertThat(expected).hasMessageThat().startsWith("2 expectations failed:"); | ||
| return true; | ||
| } | ||
| }); | ||
|
|
||
| expectWithTrace.that(true).isFalse(); | ||
| expectWithTrace | ||
| .that(alwaysFailWithCause(getFirstException("First", getSecondException("Second", null)))) | ||
| .isEqualTo(5); | ||
| } | ||
|
|
||
| @Test | ||
| public void testExpectTrace_onlyCallerException() { | ||
| verifyAssertionError.setErrorVerifier( | ||
| new Predicate<AssertionError>() { | ||
| @Override | ||
| public boolean apply(AssertionError expected) { | ||
| assertWithMessage("Should throw exception as it is if only caller exception") | ||
| .that(expected.getStackTrace().length) | ||
| .isAtLeast(2); | ||
| return true; | ||
| } | ||
| }); | ||
|
|
||
| expectWithTrace | ||
| .that(alwaysFailWithCause(getFirstException("First", getSecondException("Second", null)))) | ||
| .isEqualTo(5); | ||
| } | ||
|
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| private static long alwaysFailWithCause(Throwable throwable) { | ||
| throw new AssertionError("Always fail", throwable); | ||
| } | ||
|
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| private static Exception getFirstException(String messsage, Throwable cause) { | ||
| if (cause != null) { | ||
| return new RuntimeException(messsage, cause); | ||
| } else { | ||
| return new RuntimeException(messsage); | ||
| } | ||
| } | ||
|
|
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| private static Exception getSecondException(String messsage, Throwable cause) { | ||
| if (cause != null) { | ||
| return new RuntimeException(messsage, cause); | ||
| } else { | ||
| return new RuntimeException(messsage); | ||
| } | ||
| } | ||
|
|
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| private static class TestRuleVerifier implements TestRule { | ||
| protected Predicate<AssertionError> errorVerifier = Predicates.alwaysFalse(); | ||
|
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| private final TestRule ruleToVerify; | ||
|
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| public TestRuleVerifier(TestRule ruleToVerify) { | ||
| this.ruleToVerify = ruleToVerify; | ||
| } | ||
|
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| public void setErrorVerifier(Predicate<AssertionError> verifier) { | ||
| this.errorVerifier = verifier; | ||
| } | ||
|
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| @Override | ||
| public Statement apply(final Statement base, final Description description) { | ||
| return new Statement() { | ||
| @Override | ||
| public void evaluate() throws Throwable { | ||
| try { | ||
| ruleToVerify.apply(base, description).evaluate(); | ||
| } catch (AssertionError caught) { | ||
| if (!errorVerifier.apply(caught)) { | ||
| throw new AssertionError("Caught error doesn't meet expectation", caught); | ||
| } | ||
| } | ||
| } | ||
| }; | ||
| } | ||
| } | ||
| } |
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