How to use CustomTypeSafeMatcher class of org.hamcrest package

Best junit code snippet using org.hamcrest.CustomTypeSafeMatcher

Source:HeaderMatchers.java Github

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...18package org.w3.ldp.testsuite.matcher;19import java.util.regex.Pattern;20import org.apache.commons.lang3.StringUtils;21import org.hamcrest.BaseMatcher;22import org.hamcrest.CustomTypeSafeMatcher;23import org.hamcrest.Description;24import org.hamcrest.Matcher;25import org.jboss.resteasy.plugins.delegates.LinkDelegate;26import org.w3.ldp.testsuite.http.MediaTypes;27import javax.ws.rs.core.Link;28/**29 * Matcher collection to work with HttpHeaders.30 */31public class HeaderMatchers {32 private static final Pattern TURTLE_REGEX = Pattern.compile("^" + MediaTypes.TEXT_TURTLE + "\\s*(;|$)");33 /**34 * Regular expression matching valid ETag values.35 *36 * @see <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19">HTTP 1.1: Section 14.19 - ETag</a>37 */38 public final static String ETAG_REGEX = "^(W/)?\"([^\"]|\\\\\")*\"$";39 public static Matcher<String> headerPresent() {40 return new BaseMatcher<String>() {41 @Override42 public boolean matches(Object item) {43 return item != null && StringUtils.isNotBlank(item.toString());44 }45 @Override46 public void describeTo(Description description) {47 description.appendText("set");48 }49 };50 }51 public static Matcher<String> headerNotPresent() {52 return new BaseMatcher<String>() {53 @Override54 public boolean matches(Object item) {55 return item == null || StringUtils.isBlank(item.toString());56 }57 @Override58 public void describeTo(Description description) {59 description.appendText("absent or empty");60 }61 };62 }63 public static Matcher<String> isLink(String uri, String rel) {64 final Link expected = Link.fromUri(uri).rel(rel).build();65 return new CustomTypeSafeMatcher<String>(String.format("a Link-Header to <%s> with rel='%s'", uri, rel)) {66 @Override67 protected boolean matchesSafely(String item) {68 return expected.equals(new LinkDelegate().fromString(item));69 }70 };71 }72 public static Matcher<String> isValidEntityTag() {73 return new CustomTypeSafeMatcher<String>("a valid EntityTag value as defined in RFC2616 section 14.19 (did you quote the value?)") {74 /**75 * Checks that the ETag value is present and valid as defined in RFC261676 *77 * @param item78 * the header value79 * @return true only if the ETag is valid80 *81 * @see <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19">HTTP 1.1: Section 14.19 - ETag</a>82 */83 @Override84 protected boolean matchesSafely(String item) {85 return item.trim().matches(ETAG_REGEX);86 }87 };88 }89 /**90 * Matcher testing a Content-Type response header's compatibility with91 * JSON-LD (expects application/ld+json or application/json).92 *93 * @return the matcher94 */95 public static Matcher<String> isJsonLdCompatibleContentType() {96 return new CustomTypeSafeMatcher<String>("application/ld+json or application/json") {97 @Override98 protected boolean matchesSafely(String item) {99 return item.equals(MediaTypes.APPLICATION_LD_JSON) || item.equals(MediaTypes.APPLICATION_JSON);100 }101 };102 }103 /**104 * Matcher testing a Content-Type response header's compatibility with105 * Turtle (expects text/turtle).106 *107 * @return the matcher108 */109 public static Matcher<String> isTurtleCompatibleContentType() {110 return new CustomTypeSafeMatcher<String>("text/turtle") {111 @Override112 protected boolean matchesSafely(String item) {113 return MediaTypes.TEXT_TURTLE.equals(item)114 || TURTLE_REGEX.matcher(item).find();115 }116 };117 }118}...

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Source:IsThrowable.java Github

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1package com.bluecatcode.hamcrest.matchers;2import org.hamcrest.CustomTypeSafeMatcher;3import org.hamcrest.Description;4import org.hamcrest.Factory;5import org.hamcrest.Matcher;6import static org.hamcrest.Matchers.allOf;7import static org.hamcrest.Matchers.is;8import static org.hamcrest.core.IsInstanceOf.instanceOf;9public class IsThrowable<T extends Throwable> extends CustomTypeSafeMatcher<T> {10 private final Matcher<T> matcher;11 public IsThrowable(Matcher<T> matcher) {12 super(CustomMatchers.fixedDescription(matcher));13 this.matcher = matcher;14 }15 @Override16 protected boolean matchesSafely(T item) {17 return matcher.matches(item);18 }19 public void describeMismatchSafely(T item, Description mismatchDescription) {20 matcher.describeMismatch(item, mismatchDescription);21 }22 /**23 * Matches if value is a Throwable of type <tt>type</tt>24 *25 * @param type throwable type26 * @param <T> the throwable type27 * @return the matcher28 */29 @Factory30 public static <T extends Throwable> Matcher<T> isThrowable(Class<?> type) {31 final Matcher<T> typeMatcher = instanceOf(type);32 return new IsThrowable<>(typeMatcher);33 }34 /**35 * Matches if value is a Throwable of type <tt>type</tt> that matches the <tt>matcher</tt>36 *37 * @param type throwable type38 * @param matcher throwable matcher39 * @param <T> the throwable type40 * @return the matcher41 */42 @Factory43 public static <T extends Throwable> Matcher<T> isThrowable(Class<?> type, Matcher<? super T> matcher) {44 final Matcher<T> typeMatcher = instanceOf(type);45 return new IsThrowable<>(allOf(typeMatcher, matcher));46 }47 /**48 * Matches if value is a throwable with the <tt>message</tt>49 *50 * @param message message to match51 * @param <T> the throwable type52 * @return the matcher53 */54 @Factory55 public static <T extends Throwable> Matcher<T> withMessage(String message) {56 return withMessage(is(message));57 }58 /**59 * Matches if value is a throwable with a message that matches the <tt>matcher</tt>60 *61 * @param matcher message matcher62 * @param <T> the throwable type63 * @return the matcher64 */65 @Factory66 public static <T extends Throwable> Matcher<T> withMessage(final Matcher<String> matcher) {67 return new CustomTypeSafeMatcher<T>(CustomMatchers.fixedDescription("message ", matcher)) {68 @Override69 protected boolean matchesSafely(T item) {70 return matcher.matches(item.getMessage());71 }72 public void describeMismatchSafely(T item, Description mismatchDescription) {73 matcher.describeMismatch(item.getMessage(), mismatchDescription);74 }75 };76 }77 /**78 * Matches if value is a throwable with a cause that matches the <tt>matcher</tt>79 *80 * @param matcher cause matcher81 * @param <T> the throwable type82 * @param <C> the cause throwable type83 * @return the matcher84 */85 @Factory86 public static <T extends Throwable, C extends Throwable> Matcher<T> withCause(final Matcher<C> matcher) {87 return new CustomTypeSafeMatcher<T>(CustomMatchers.fixedDescription("cause ", matcher)) {88 @Override89 protected boolean matchesSafely(T item) {90 return matcher.matches(item.getCause());91 }92 public void describeMismatchSafely(T item, Description mismatchDescription) {93 matcher.describeMismatch(item.getCause(), mismatchDescription);94 }95 };96 }97}...

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Source:CarHamcrestMatcher.java Github

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1package com.kspichale.assert_playground.hamcrest;23import org.apache.commons.lang.builder.ToStringBuilder;4import org.hamcrest.CustomTypeSafeMatcher;5import org.hamcrest.Description;6import org.hamcrest.Factory;7import org.hamcrest.Matcher;8import org.hamcrest.TypeSafeMatcher;910import com.kspichale.assert_playground.model.Car;11import com.kspichale.assert_playground.model.EngineType;12import com.kspichale.assert_playground.model.Extra;1314public class CarHamcrestMatcher extends TypeSafeMatcher<Car> {1516 private Matcher<Car> matcher;1718 public CarHamcrestMatcher(Matcher<Car> matcher) {19 super();20 this.matcher = matcher;21 }2223 @Factory24 public static <T> Matcher<Car> hasExtras(Extra... extras) {25 Matcher<Car> matcher = new HasExtras(extras);26 return new CarHamcrestMatcher(matcher);27 }2829 @Factory30 public static CarHamcrestMatcher hasMinimumExtrasCount(int i) {31 Matcher<Car> matcher = new HasMinimumExtraCount(i);32 return new CarHamcrestMatcher(matcher);33 }3435 @Factory36 public static <T> Matcher<Car> hasEngineType(EngineType engineType) {37 Matcher<Car> matcher = new HasEngineType(engineType);38 return new CarHamcrestMatcher(matcher);39 }4041 @Override42 public void describeTo(Description desc) {43 this.matcher.describeTo(desc);44 }4546 @Override47 protected boolean matchesSafely(Car car) {48 return this.matcher.matches(car);49 }5051 private static class HasEngineType extends CustomTypeSafeMatcher<Car> {5253 private EngineType engineType;5455 public HasEngineType(EngineType engineType) {56 super("engine type is " + engineType);57 this.engineType = engineType;58 }5960 @Override61 protected boolean matchesSafely(Car car) {62 return car.getEngineType().equals(engineType);63 }64 }6566 private static class HasMinimumExtraCount extends CustomTypeSafeMatcher<Car> {6768 private int minimunExtraCount;6970 public HasMinimumExtraCount(int minimunExtraCount) {71 super("has at least " + minimunExtraCount + " extras");72 this.minimunExtraCount = minimunExtraCount;73 }7475 @Override76 protected boolean matchesSafely(Car car) {77 return car.getExtras().size() >= minimunExtraCount;78 }79 }8081 private static class HasExtras extends CustomTypeSafeMatcher<Car> {8283 private Extra[] extras;8485 public HasExtras(Extra... extras) {86 super("has extras " + ToStringBuilder.reflectionToString(extras));87 this.extras = extras;88 }8990 @Override91 protected boolean matchesSafely(Car car) {92 if (car.getExtras().size() != extras.length) {93 return false;94 }95 for (Extra extra : extras) { ...

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Source:DockerMatchers.java Github

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2import com.github.dockerjava.api.command.InspectContainerResponse;3import com.github.dockerjava.api.model.Volume;4import com.github.dockerjava.core.DockerRule;5import com.github.dockerjava.core.RemoteApiVersion;6import org.hamcrest.CustomTypeSafeMatcher;7import org.hamcrest.Description;8import org.hamcrest.FeatureMatcher;9import org.hamcrest.Matcher;10import java.util.ArrayList;11import java.util.List;12import static com.github.dockerjava.utils.TestUtils.getVersion;13/**14 * @author Kanstantsin Shautsou15 */16public class DockerMatchers {17 private DockerMatchers() {18 }19 public static MountedVolumes mountedVolumes(Matcher<? super List<Volume>> subMatcher) {20 return new MountedVolumes(subMatcher, "Mounted volumes", "mountedVolumes");21 }22 public static class MountedVolumes extends FeatureMatcher<InspectContainerResponse, List<Volume>> {23 public MountedVolumes(Matcher<? super List<Volume>> subMatcher, String featureDescription, String featureName) {24 super(subMatcher, featureDescription, featureName);25 }26 @Override27 public List<Volume> featureValueOf(InspectContainerResponse item) {28 List<Volume> volumes = new ArrayList<>();29 for (InspectContainerResponse.Mount mount : item.getMounts()) {30 volumes.add(mount.getDestination());31 }32 return volumes;33 }34 }35 public static Matcher<DockerRule> apiVersionGreater(final RemoteApiVersion version) {36 return new CustomTypeSafeMatcher<DockerRule>("is greater") {37 public boolean matchesSafely(DockerRule dockerRule) {38 return getVersion(dockerRule.getClient()).isGreater(version);39 }40 };41 }42 public static Matcher<DockerRule> isGreaterOrEqual(final RemoteApiVersion version) {43 return new CustomTypeSafeMatcher<DockerRule>("is greater or equal") {44 public boolean matchesSafely(DockerRule dockerRule) {45 return getVersion(dockerRule.getClient()).isGreaterOrEqual(version);46 }47 @Override48 protected void describeMismatchSafely(DockerRule rule, Description mismatchDescription) {49 mismatchDescription50 .appendText(" was ")51 .appendText(getVersion(rule.getClient()).toString());52 }53 };54 }55}...

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Source:CustomViewMatchers.java Github

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...8public final class CustomViewMatchers {9 private CustomViewMatchers() {10 }11 public static Matcher<View> withValueEqualToTextView(final int viewId) {12 return CustomTypeSafeMatcher.create(viewId);13 }14 public static Matcher<View> withDigitsOnlyEqualsToTextView(final int viewId) {15 return CustomTypeSafeMatcher.createForDigits(viewId);16 }17 static final class CustomTypeSafeMatcher extends TypeSafeMatcher<View> {18 private static final String EXTRACT_DIGITS_REGEX = "\\D+";19 private final boolean shouldExtractDigits;20 @IdRes private final int viewId;21 /* default */ static CustomTypeSafeMatcher create(@IdRes final int viewId) {22 return new CustomTypeSafeMatcher(viewId, false);23 }24 /* default */ static CustomTypeSafeMatcher createForDigits(@IdRes final int viewId) {25 return new CustomTypeSafeMatcher(viewId, true);26 }27 private CustomTypeSafeMatcher(@IdRes final int viewId, final boolean shouldExtractDigits) {28 this.viewId = viewId;29 this.shouldExtractDigits = shouldExtractDigits;30 }31 @Override32 public void describeTo(final Description description) {33 description.appendText("Has EditText/TextView the value equals to view: " + viewId);34 }35 @Override36 public boolean matchesSafely(final View view) {37 final View viewById = view.getRootView().findViewById(viewId);38 if (!(view instanceof TextView || !(viewById instanceof TextView))) {39 return false;40 }41 //noinspection ConstantConditions...

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Source:DriveThruMatcher.java Github

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1package vehiclesurvey;2import org.hamcrest.CustomTypeSafeMatcher;3import org.hamcrest.Matcher;4import org.hamcrest.core.AllOf;5import vehiclesurvey.time.Time;6import java.util.ArrayList;7import java.util.Collection;8import static java.lang.Math.abs;9import static vehiclesurvey.time.Time.time;10/*11* A fluent interface for matchers someDriveThru().atTime(1234).withSpeed(62.1).....12* */13public class DriveThruMatcher extends CustomTypeSafeMatcher<DriveThru> {14 private Collection<Matcher<DriveThru>> matchers;15 public DriveThruMatcher() {16 super("Composite matcher");17 matchers = new ArrayList<Matcher<DriveThru>>();18 }19 @Override20 protected boolean matchesSafely(DriveThru item) {21 return new AllOf(matchers).matches(item);22 }23 public static DriveThruMatcher someDriveThru() {24 return new DriveThruMatcher();25 }26 public DriveThruMatcher atTime(int timeStamp) {27 final Time time = time(timeStamp);28 matchers.add(new CustomTypeSafeMatcher<DriveThru>("Expected drive through with time: " + time) {29 @Override30 protected boolean matchesSafely(DriveThru item) {31 return time.equals(item.time);32 }33 });34 return this;35 }36 public DriveThruMatcher onDay(final int day) {37 matchers.add(new CustomTypeSafeMatcher<DriveThru>("Expected drive through on day: " + day) {38 @Override39 protected boolean matchesSafely(DriveThru item) {40 return item.day == day;41 }42 });43 return this;44 }45 public DriveThruMatcher withSpeed(final double speed) {46 matchers.add(new CustomTypeSafeMatcher<DriveThru>("Expected drive through with speed: " + speed) {47 @Override48 protected boolean matchesSafely(DriveThru item) {49 return abs(item.speed - speed) < .01;50 }51 });52 return this;53 }54}...

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Source:VibratoMatchers.java Github

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1package vibrato.testtools;2import org.hamcrest.CustomTypeSafeMatcher;3import org.hamcrest.Matcher;4import vibrato.complex.Complex;5import vibrato.complex.ComplexNumber;6public class VibratoMatchers {7 private static final double precision = 1 / (double) (1 << 24);8 public static Matcher<Double> approximatelyEqualTo(double expectedValue) {9 double acceptableError = Math.abs(expectedValue) <= precision ? precision * precision : Math.abs(expectedValue) * precision;10 double min = expectedValue - acceptableError;11 double max = expectedValue + acceptableError;12 return new CustomTypeSafeMatcher<Double>("Equal to " + expectedValue + " +/- " + acceptableError) {13 @Override14 protected boolean matchesSafely(Double actualValue) {15 return actualValue != null && min <= actualValue && actualValue <= max;16 }17 };18 }19 public static <T extends Complex<?>> Matcher<T> approximatelyEqualTo(T expectedValue) {20 ComplexNumber expectedComplexValue = ComplexNumber.createRI(expectedValue.real(), expectedValue.imaginary());21 double acceptableError = expectedComplexValue.length() <= precision ? precision * precision : expectedComplexValue.length() * precision;22 return new CustomTypeSafeMatcher<T>("Equal to " + expectedComplexValue.toRIString() + " +/- " + acceptableError) {23 @Override24 protected boolean matchesSafely(T actualValue) {25 double error = actualValue != null ? expectedComplexValue.minus(actualValue).length() : Double.MAX_VALUE;26 return error <= acceptableError;27 }28 };29 }30}...

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Source:CustomTypeSafeMatcher.java Github

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...19/* */ 20/* */ 21/* */ 22/* */ 23/* */ public abstract class CustomTypeSafeMatcher<T>24/* */ extends TypeSafeMatcher<T>25/* */ {26/* */ private final String fixedDescription;27/* */ 28/* */ public CustomTypeSafeMatcher(String description) {29/* 29 */ if (description == null) {30/* 30 */ throw new IllegalArgumentException("Description must be non null!");31/* */ }32/* 32 */ this.fixedDescription = description;33/* */ }34/* */ 35/* */ 36/* */ public final void describeTo(Description description) {37/* 37 */ description.appendText(this.fixedDescription);38/* */ }39/* */ }40/* Location: C:\Users\CAR\Desktop\sab\SAB_projekat_1920\SAB_projekat_1920\SAB_projekat_1920.jar!\org\hamcrest\CustomTypeSafeMatcher.class41 * Java compiler version: 5 (49.0)42 * JD-Core Version: 1.1.343 */...

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CustomTypeSafeMatcher

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1import static org.hamcrest.MatcherAssert.assertThat;2import static org.hamcrest.Matchers.equalTo;3import static org.hamcrest.Matchers.is;4import java.util.ArrayList;5import java.util.List;6import org.hamcrest.Description;7import org.hamcrest.Matcher;8import org.hamcrest.TypeSafeMatcher;9import org.junit.Test;10public class CustomTypeSafeMatcher {11 public void testCustomTypeSafeMatcher() {12 List<Integer> list = new ArrayList<Integer>();13 list.add(1);14 list.add(2);15 list.add(3);16 list.add(4);17 list.add(5);18 assertThat(list, is(new CustomListMatcher<Integer>(equalTo(3))));19 }20}21class CustomListMatcher<T> extends TypeSafeMatcher<List<T>> {22 private final Matcher<T> matcher;23 public CustomListMatcher(Matcher<T> matcher) {24 this.matcher = matcher;25 }26 public void describeTo(Description description) {27 description.appendText("list containing ").appendDescriptionOf(matcher);28 }29 protected boolean matchesSafely(List<T> item) {30 for (T element : item) {31 if (matcher.matches(element)) {32 return true;33 }34 }35 return false;36 }37}38Related posts: How to use Custom Hamcrest Matcher in JUnit Test? JUnit Test for Custom Exception JUnit Test for Custom Exception with @Test(expected = Exception.class) JUnit Test for Custom Exception with @Rule ExpectedException JUnit Test for Custom Exception with ExpectedException Rule JUnit Test for Custom Exception with ExpectedException Rule

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CustomTypeSafeMatcher

Using AI Code Generation

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1import org.hamcrest.Description;2import org.hamcrest.Factory;3import org.hamcrest.Matcher;4import org.hamcrest.TypeSafeMatcher;5public class CustomTypeSafeMatcher<T> extends TypeSafeMatcher<T> {6 private final T expectedValue;7 private String expectedValueDescription;8 public CustomTypeSafeMatcher(T expectedValue) {9 this.expectedValue = expectedValue;10 }11 public CustomTypeSafeMatcher(T expectedValue, String expectedValueDescription) {12 this.expectedValue = expectedValue;13 this.expectedValueDescription = expectedValueDescription;14 }15 protected boolean matchesSafely(T actualValue) {16 return expectedValue.equals(actualValue);17 }18 public void describeTo(Description description) {19 description.appendText("value should be " + expectedValue);20 if (expectedValueDescription != null) {21 description.appendText(" (" + expectedValueDescription + ")");22 }23 }24 public static <T> Matcher<T> isValue(T expectedValue) {25 return new CustomTypeSafeMatcher<T>(expectedValue);26 }27 public static <T> Matcher<T> isValue(T expectedValue, String expectedValueDescription) {28 return new CustomTypeSafeMatcher<T>(expectedValue, expectedValueDescription);29 }30}31public class CustomTypeSafeMatcherTest {32 public void testCustomTypeSafeMatcher() {33 assertThat("Hello", isValue("Hello"));34 assertThat("Hello", isValue("Hello", "Hello World"));35 }36}37org.junit.ComparisonFailure: value should be Hello (Hello World) expected:<[Hello]> but was:<[World]>38 at org.junit.Assert.assertEquals(Assert.java:115)39 at org.junit.Assert.assertEquals(Assert.java:144)40 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)41 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)42 at org.codejava.junit.CustomTypeSafeMatcherTest.testCustomTypeSafeMatcher(CustomTypeSafeMatcherTest.java:19)43The describeTo() method

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CustomTypeSafeMatcher

Using AI Code Generation

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1import org.hamcrest.CustomTypeSafeMatcher;2import org.hamcrest.Matcher;3import org.hamcrest.Description;4public class CustomMatcherExample extends CustomTypeSafeMatcher<String> {5 public CustomMatcherExample(String expected) {6 super(expected);7 }8 protected boolean matchesSafely(String actual) {9 return actual.equals(expected);10 }11 public void describeTo(Description description) {12 description.appendText("Expected value is: " + expected);13 }14 public static Matcher<String> isValue(String expected) {15 return new CustomMatcherExample(expected);16 }17}18import org.hamcrest.CustomMatcher;19import org.hamcrest.Description;20public class CustomMatcherExample extends CustomMatcher<String> {21 private String expected;22 public CustomMatcherExample(final String expected) {23 super("Expected value is: " + expected);24 this.expected = expected;25 }26 public boolean matches(Object actual) {27 return actual.equals(expected);28 }29 public void describeTo(Description description) {30 description.appendText("Expected value is: " + expected);31 }32}33import org.hamcrest.CustomMatcher;34import org.hamcrest.Description;35public class CustomMatcherExample extends CustomMatcher<String> {36 private String expected;37 public CustomMatcherExample(final String expected) {38 super("Expected value is: " + expected);39 this.expected = expected;40 }41 public boolean matches(Object actual) {42 return actual.equals(expected);43 }44 public void describeTo(Description description) {45 description.appendText("Expected value is: " + expected);46 }47}48import org.hamcrest.CustomMatcher;49import org.hamcrest.Description;50public class CustomMatcherExample extends CustomMatcher<String> {51 private String expected;52 public CustomMatcherExample(final String expected) {53 super("Expected value is: " + expected);54 this.expected = expected;55 }56 public boolean matches(Object actual) {57 return actual.equals(expected);58 }59 public void describeTo(Description description) {60 description.appendText("Expected value is: " + expected);61 }62}63import org.hamcrest.CustomMatcher;64import org.hamcrest.Description;

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CustomTypeSafeMatcher

Using AI Code Generation

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1public class CustomTypeSafeMatcher extends TypeSafeMatcher {2 private String expected;3 public CustomTypeSafeMatcher(String expected) {4 this.expected = expected;5 }6 protected boolean matchesSafely(Object actual) {7 return expected.equals(actual);8 }9 public void describeTo(Description description) {10 description.appendText("expected: " + expected);11 }12 protected void describeMismatchSafely(Object item, Description mismatchDescription) {13 mismatchDescription.appendText("was: " + item);14 }15}16public class CustomBaseMatcher extends BaseMatcher {17 private String expected;18 public CustomBaseMatcher(String expected) {19 this.expected = expected;20 }21 public boolean matches(Object actual) {22 return expected.equals(actual);23 }24 public void describeTo(Description description) {25 description.appendText("expected: " + expected);26 }27 public void describeMismatch(Object item, Description mismatchDescription) {28 mismatchDescription.appendText("was: " + item);29 }30}31public class CustomMatcherTest {32 public void testTypeSafeMatcher() {33 assertThat("Hello World", new CustomTypeSafeMatcher("Hello World"));34 }35 public void testBaseMatcher() {36 assertThat("Hello World", new CustomBaseMatcher("Hello World"));37 }38}39 at org.junit.Assert.assertEquals(Assert.java:115)40 at org.junit.Assert.assertEquals(Assert.java:144)41 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)42 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)43 at com.vogella.junit.first.CustomMatcherTest.testTypeSafeMatcher(CustomMatcherTest.java:19)44 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)45 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)46 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)47 at java.lang.reflect.Method.invoke(Method.java:498)

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CustomTypeSafeMatcher

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1import org.hamcrest.BaseMatcher;2import org.hamcrest.Description;3import org.hamcrest.Matcher;4import org.hamcrest.TypeSafeMatcher;5import java.util.List;6public class CustomTypeSafeMatcher {7 public static Matcher<List> hasSize(final int size) {8 return new TypeSafeMatcher<List>() {9 public boolean matchesSafely(List list) {10 return list.size() == size;11 }12 public void describeTo(Description description) {13 description.appendText("List size should be ").appendValue(size);14 }15 };16 }17 public static Matcher<String> containsString(final String substring) {18 return new BaseMatcher<String>() {19 public boolean matches(Object item) {20 return item.toString().contains(substring);21 }22 public void describeTo(Description description) {23 description.appendText("String should contain ").appendValue(substring);24 }25 };26 }27}28import org.hamcrest.Matcher;29import org.junit.Test;30import java.util.Arrays;31import java.util.List;32import static org.hamcrest.CoreMatchers.containsString;33import static org.hamcrest.CoreMatchers.is;34import static org.hamcrest.MatcherAssert.assertThat;35import static org.hamcrest.Matchers.hasSize;36public class CustomTypeSafeMatcherTest {37 public void testCustomTypeSafeMatcher() {38 List<String> list = Arrays.asList("one", "two", "three");39 assertThat(list, hasSize(3));40 assertThat(list, hasSize(is(3)));41 assertThat(list, hasSize(Matchers.is(3)));42 assertThat("one two three", containsString("one"));43 assertThat("one two three", containsString(Matchers.is("one")));44 }45}

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1public static String streamToString(final InputStream inputStream) throws Exception {2 // buffering optional3 try4 (5 final BufferedReader br6 = new BufferedReader(new InputStreamReader(inputStream))7 ) {8 // parallel optional9 return br.lines().parallel().collect(Collectors.joining("\n"));10 } catch (final IOException e) {11 throw new RuntimeException(e);12 // whatever.13 }14}15
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