How to use BaseDescription class of org.hamcrest package

Best junit code snippet using org.hamcrest.BaseDescription

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1package org.hamcrest;2import org.junit.Test;3import static org.junit.Assert.assertEquals;4public final class BaseDescriptionTest {5 private final StringBuilder result = new StringBuilder();6 private final BaseDescription baseDescription = new BaseDescription() {7 @Override protected void append(char c) {8 result.append(c);9 }10 };11 @Test public void 12 describesAppendedNullValue() {13 baseDescription.appendValue(null);14 assertEquals("null", result.toString());15 }16 @Test public void 17 quotesAppendedStringValue() {18 baseDescription.appendValue("foo");19 assertEquals("\"foo\"", result.toString());20 }...

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1package org.echocat.unittest.utils.matchers;2import org.hamcrest.BaseMatcher;3import org.hamcrest.Description;4import org.hamcrest.Matcher;5import javax.annotation.Nonnull;6import javax.annotation.Nullable;7import java.util.Optional;8public class OptionalBasedMatcher<T> extends BaseMatcher<Optional<T>> {9 @Nonnull10 protected static <T> BaseChecker<T> isPresentBaseChecker() {11 return Optional::isPresent;12 }13 @Nonnull14 protected static <T> BaseChecker<T> isAbsentBaseChecker() {15 return actual -> !actual.isPresent();16 }17 @Nonnull18 private final String baseDescription;19 @Nonnull20 private final BaseChecker<T> baseChecker;21 @Nonnull22 private final Optional<Matcher<T>> contentMatcher;23 protected OptionalBasedMatcher(@Nonnull String baseDescription, @Nonnull BaseChecker<T> baseChecker, @Nullable Matcher<T> contentMatcher) {24 this.baseDescription = baseDescription;25 this.baseChecker = baseChecker;26 this.contentMatcher = Optional.ofNullable(contentMatcher);27 }28 @Override29 public boolean matches(@Nullable Object item) {30 if (!(item instanceof Optional)) {31 return false;32 }33 /​/​noinspection unchecked34 final Optional<T> optional = (Optional<T>) item;35 if (!baseChecker().check(optional)) {36 return false;37 }38 return contentMatcher()39 .map(matcher -> matcher.matches(40 optional.orElseThrow(() -> new IllegalStateException("The base checker should cover presence of optional value before.")))41 )42 .orElse(true);43 }44 @Override45 public void describeTo(@Nonnull Description description) {46 description.appendText(baseDescription());47 contentMatcher().ifPresent(matcher -> matcher.describeTo(description));48 }49 @Nonnull50 protected String baseDescription() {51 return baseDescription;52 }53 @Nonnull54 protected BaseChecker<T> baseChecker() {55 return baseChecker;56 }57 @Nonnull58 protected Optional<Matcher<T>> contentMatcher() {59 return contentMatcher;60 }61 @FunctionalInterface62 public interface BaseChecker<T> {63 boolean check(@Nonnull Optional<T> actual);64 }65}...

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1package org.hamcrest;2import java.io.IOException;3public class StringDescription extends BaseDescription {4 private final Appendable out;5 public StringDescription() {6 this(new StringBuilder());7 }8 public StringDescription(Appendable out2) {9 this.out = out2;10 }11 public static String toString(SelfDescribing selfDescribing) {12 return new StringDescription().appendDescriptionOf(selfDescribing).toString();13 }14 public static String asString(SelfDescribing selfDescribing) {15 return toString(selfDescribing);16 }17 /​* access modifiers changed from: protected */​18 @Override /​/​ org.hamcrest.BaseDescription19 public void append(String str) {20 try {21 this.out.append(str);22 } catch (IOException e) {23 throw new RuntimeException("Could not write description", e);24 }25 }26 /​* access modifiers changed from: protected */​27 @Override /​/​ org.hamcrest.BaseDescription28 public void append(char c) {29 try {30 this.out.append(c);31 } catch (IOException e) {32 throw new RuntimeException("Could not write description", e);33 }34 }35 public String toString() {36 return this.out.toString();37 }38}...

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1public abstract class org.hamcrest.BaseDescription implements org.hamcrest.Description {2 public org.hamcrest.BaseDescription();3 public org.hamcrest.Description appendText(java.lang.String);4 public org.hamcrest.Description appendDescriptionOf(org.hamcrest.SelfDescribing);5 public org.hamcrest.Description appendValue(java.lang.Object);6 public <T> org.hamcrest.Description appendValueList(java.lang.String, java.lang.String, java.lang.String, T...);7 public <T> org.hamcrest.Description appendValueList(java.lang.String, java.lang.String, java.lang.String, java.lang.Iterable<T>);8 public org.hamcrest.Description appendList(java.lang.String, java.lang.String, java.lang.String, java.lang.Iterable<? extends org.hamcrest.SelfDescribing>);9 protected void append(java.lang.String);10 protected abstract void append(char);11}...

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BaseDescription

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1import org.hamcrest.BaseDescription2import org.hamcrest.BaseMatcher3import org.hamcrest.Description4import org.hamcrest.Matcher5import org.junit.Test6import org.junit.Assert7import org.junit.Before8import org.junit.After9import org.junit.TestResult10import org.junit.TestListener11import org.junit.runner.RunWith12import org.junit.runners.Suite13import org.junit.runners.Suite.SuiteClasses14import org.junit.rules.TestWatcher15import org.junit.runner.Description16import org.junit.runner.RunWith17import org.junit.runner.RunWith18import org.junit.runner.RunWith19import org.junit.runner.RunWith20import org.junit.runner.RunWith21import org.junit.runner.RunWith22import org.junit.runner.RunWith23import org.junit.runner.RunWith24import org.junit.runner.RunWith25import org.junit.runner.RunWith26import org.junit.runner.RunWith27import org.junit.runner.RunWith28import org.junit.runner.RunWith

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BaseDescription

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1import org.hamcrest.BaseDescription;2import org.hamcrest.Description;3public class BaseDescriptionExample {4 public static void main(String[] args) {5 Description description = new BaseDescription() {6 public Description appendText(String text) {7 return this;8 }9 public Description appendDescriptionOf(org.hamcrest.SelfDescribing value) {10 return this;11 }12 };13 }14}

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BaseDescription

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1package com.example;2import org.hamcrest.BaseDescription;3import org.hamcrest.Description;4public class BaseDescriptionExample {5 public static void main(String[] args) {6 Description description = new BaseDescription() {7 public Description appendText(String text) {8 return null;9 }10 public Description appendDescriptionOf(Description description) {11 return null;12 }13 public String toString() {14 return null;15 }16 };17 }18}19appendText() method20appendDescriptionOf() method21toString() method22appendText() method23public Description appendText(String text)24appendDescriptionOf() method25public Description appendDescriptionOf(Description description)26toString() method27public String toString()

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BaseDescription

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1import org.hamcrest.BaseDescription;2import org.hamcrest.Description;3public class MyDescription extends BaseDescription {4 private String description;5 public Description appendText(String text) {6 description = text;7 return this;8 }9 public String getDescription() {10 return description;11 }12}13import org.hamcrest.Description;14import org.hamcrest.StringDescription;15public class MyDescription {16 private String description;17 public String getDescription() {18 return description;19 }20 public void setDescription(String description) {21 this.description = description;22 }23 public String toString() {24 Description description = new StringDescription();25 appendTo(description);26 return description.toString();27 }28 public void appendTo(Description description) {29 description.appendText(getDescription());30 }31}32import org.hamcrest.Description;33import org.hamcrest.StringDescription;34public class MyDescription {35 private String description;36 public String getDescription() {37 return description;38 }39 public void setDescription(String description) {40 this.description = description;41 }42 public String toString() {43 Description description = new StringDescription();44 appendTo(description);45 return description.toString();46 }47 public void appendTo(Description description) {48 description.appendText(getDescription());49 }50}51import org.hamcrest.BaseDescription;52import org.hamcrest.Description;53public class MyDescription extends BaseDescription {54 private String description;55 public Description appendText(String text) {56 description = text;57 return this;58 }59 public String getDescription() {60 return description;61 }62}63import org.hamcrest.Description;64import org.hamcrest.StringDescription;65public class MyDescription {66 private String description;67 public String getDescription() {68 return description;69 }70 public void setDescription(String description) {71 this.description = description;72 }73 public String toString() {74 Description description = new StringDescription();75 appendTo(description);76 return description.toString();77 }78 public void appendTo(Description description) {79 description.appendText(getDescription());80 }81}82import org.hamcrest.Description;83import org.hamcrest.StringDescription;84public class MyDescription {85 private String description;

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BaseDescription

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1import org.hamcrest.BaseDescription;2import org.hamcrest.Description;3public class DescriptionImpl extends BaseDescription {4 public static void main(String[] args) {5 Description description = new DescriptionImpl();6 description.appendText("This is a test");7 description.appendText("This is a test").appendText("This is a test");8 description.appendText("This is a test").appendText("This is a test").appendText("This is a test");9 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");10 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");11 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");12 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");13 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");14 description.appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test").appendText("This is a test");15 System.out.println(description.toString());16 }17}

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BaseDescription

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1 public void testBaseDescription() {2 BaseDescription description = new BaseDescription();3 description.appendText("This is a test");4 description.appendText("This is another test");5 description.appendText("This is a third test");6 System.out.println(description.toString());7 }8}

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1WebDriver driver = new FirefoxDriver();23driver.manage().window().maximize();4driver.get("https:/​/​www.irctc.co.in/​");5String oldTab = driver.getWindowHandle();67/​/​For opening window in New Tab8String selectLinkOpeninNewTab = Keys.chord(Keys.CONTROL,Keys.RETURN); 9driver.findElement(By.linkText("Hotels & Lounge")).sendKeys(selectLinkOpeninNewTab);1011/​/​ Perform Ctrl + Tab to focus on new Tab window12new Actions(driver).sendKeys(Keys.chord(Keys.CONTROL, Keys.TAB)).perform();1314/​/​ Switch driver control to focused tab window15driver.switchTo().window(oldTab);1617driver.findElement(By.id("textfield")).sendKeys("bangalore");18
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Discussion

JUnit 4 Expected Exception type

java: how to mock Calendar.getInstance()?

Changing names of parameterized tests

Mocking a class vs. mocking its interface

jUnit ignore @Test methods from base class

Important frameworks/tools to learn

Unit testing a Java Servlet

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Different teardown for each @Test in jUnit

Best way to automagically migrate tests from JUnit 3 to JUnit 4?

There's actually an alternative to the @Test(expected=Xyz.class) in JUnit 4.7 using Rule and ExpectedException

In your test case you declare an ExpectedException annotated with @Rule, and assign it a default value of ExpectedException.none(). Then in your test that expects an exception you replace the value with the actual expected value. The advantage of this is that without using the ugly try/catch method, you can further specify what the message within the exception was

@Rule public ExpectedException thrown= ExpectedException.none();

@Test
public void myTest() {
    thrown.expect( Exception.class );
    thrown.expectMessage("Init Gold must be >= 0");

    rodgers = new Pirate("Dread Pirate Rodgers" , -100);
}

Using this method, you might be able to test for the message in the generic exception to be something specific.

ADDITION Another advantage of using ExpectedException is that you can more precisely scope the exception within the context of the test case. If you are only using @Test(expected=Xyz.class) annotation on the test, then the Xyz exception can be thrown anywhere in the test code -- including any test setup or pre-asserts within the test method. This can lead to a false positive.

Using ExpectedException, you can defer specifying the thrown.expect(Xyz.class) until after any setup and pre-asserts, just prior to actually invoking the method under test. Thus, you more accurately scope the exception to be thrown by the actual method invocation rather than any of the test fixture itself.

JUnit 5 NOTE:

JUnit 5 JUnit Jupiter has removed @Test(expected=...), @Rule and ExpectedException altogether. They are replaced with the new assertThrows(), which requires the use of Java 8 and lambda syntax. ExpectedException is still available for use in JUnit 5 through JUnit Vintage. Also JUnit Jupiter will also continue to support JUnit 4 ExpectedException through use of the junit-jupiter-migrationsupport module, but only if you add an additional class-level annotation of @EnableRuleMigrationSupport.

https://stackoverflow.com/questions/16723715/junit-4-expected-exception-type

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