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How to use CustomMatcher class of org.hamcrest package

Best junit code snippet using org.hamcrest.CustomMatcher

Source:ExceptionMatcher.java

...13 * See the License for the specific language governing permissions and14 * limitations under the License.15 */16package org.terracotta.testing;17import org.hamcrest.CustomMatcher;18import org.hamcrest.Description;19import org.hamcrest.Matcher;20import org.hamcrest.TypeSafeMatcher;21import static java.util.Objects.requireNonNull;22import static org.hamcrest.CoreMatchers.instanceOf;23/**24 * @author Mathieu Carbou25 */26public class ExceptionMatcher extends TypeSafeMatcher<ExceptionMatcher.Closure> {27  private static final CustomMatcher<String> ANY_MESSAGE = new CustomMatcher<String>("ANY MESSAGE") {28    @Override29    public boolean matches(Object item) {30      return true;31    }32  };33  private static final CustomMatcher<? super Class<? extends Throwable>> ANY_CAUSE = new CustomMatcher<Class<? extends Throwable>>("ANY CAUSE") {34    @Override35    public boolean matches(Object item) {36      return true;37    }38  };39  private final Matcher<? super Class<? extends Throwable>> typeMatcher;40  private Matcher<? super String> messageMatcher = ANY_MESSAGE;41  private Matcher<? super Class<? extends Throwable>> causeMatcher = ANY_CAUSE;42  private Throwable failure;43  private boolean debug;44  private ExceptionMatcher(Matcher<? super Class<? extends Throwable>> typeMatcher) {45    this.typeMatcher = requireNonNull(typeMatcher);46  }47  @Override...

Source:CustomMatcher.java

...5import org.hamcrest.TypeSafeMatcher;6import java.lang.reflect.ParameterizedType;7import java.lang.reflect.Type;8import static org.hamcrest.core.Is.is;9public class CustomMatcher {10    public interface MatcherRule<T extends View> {11        boolean matches(T view);12    }13    public static Matcher<View> withCustomMatch(final MatcherRule rule) {14        return new TypeSafeMatcher<View>() {15            final Matcher<Boolean> matcher = is(true);16            @Override17            protected boolean matchesSafely(View item) {18                Class expectedClass = getGenericClass(rule);19                Class actualClass = item.getClass();20                if(expectedClass.isAssignableFrom(actualClass)) {21                    return matcher.matches(rule.matches(item));22                } else {23                    String error = "\n\n" +24                            "You specified to use type [" + expectedClass + "] in CustomMatcher.\n" +25                            "But matcher target view class was [" +actualClass+"].\n"+26                            "This exception occurs like below case\n\n"+27                            "expect(R.id.textview).should(new CustomMatcher.MatcherRule<ImageView>() {\n"+28                            ".    @Override\n" +29                            ".    public boolean matches(ImageView view) {\n" +30                            ".        // ...\n" +31                            ".    }});"+32                            "\n";33                    throw new ClassCastException(error);34                }35            }36            @Override37            public void describeTo(Description description) {38                description.appendText("Custom matching result ");39                matcher.describeTo(description);40            }41        };42    }43    private static Class getGenericClass(Object object) {44        Class<?> clazz = object.getClass();45        Type[] type = clazz.getGenericInterfaces();46        // ClassCastException is occur when no generic type is specified on MatcherRule like this47        // expect(id(android.R.id.message)).should(new CustomMatcher.MatcherRule() {48        //     @Override49        //     public boolean matches(View view) {50        //        return false;51        //    }});52        try {53            ParameterizedType pt = (ParameterizedType) type[0];54            Type[] actualTypeArguments = pt.getActualTypeArguments();55            return (Class<?>) actualTypeArguments[0];56        } catch (ClassCastException e) {57            return View.class;58        }59    }60}...

Source:TestMatchers.java

...3 * or more contributor license agreements. Licensed under the Elastic License;4 * you may not use this file except in compliance with the Elastic License.5 */6package org.elasticsearch.test;7import org.hamcrest.CustomMatcher;8import org.hamcrest.Matcher;9import org.hamcrest.Matchers;10import java.nio.file.Files;11import java.nio.file.LinkOption;12import java.nio.file.Path;13import java.util.function.Predicate;14import java.util.regex.Pattern;15public class TestMatchers extends Matchers {16    public static Matcher<Path> pathExists(Path path, LinkOption... options) {17        return new CustomMatcher<Path>("Path " + path + " exists") {18            @Override19            public boolean matches(Object item) {20                return Files.exists(path, options);21            }22        };23    }24    public static <T> Matcher<Predicate<T>> predicateMatches(T value) {25        return new CustomMatcher<Predicate<T>>("Matches " + value) {26            @Override27            public boolean matches(Object item) {28                if (Predicate.class.isInstance(item)) {29                    return ((Predicate<T>) item).test(value);30                } else {31                    return false;32                }33            }34        };35    }36    public static Matcher<String> matchesPattern(String regex) {37        return matchesPattern(Pattern.compile(regex));38    }39    public static Matcher<String> matchesPattern(Pattern pattern) {40        return predicate("Matches " + pattern.pattern(), String.class, pattern.asPredicate());41    }42    private static <T> Matcher<T> predicate(String description, Class<T> type, Predicate<T> predicate) {43        return new CustomMatcher<T>(description) {44            @Override45            public boolean matches(Object item) {46                if (type.isInstance(item)) {47                    return predicate.test(type.cast(item));48                } else {49                    return false;50                }51            }52        };53    }54}...

Source:AssertionsShowTest.java

...9import static org.hamcrest.CoreMatchers.everyItem;10import static org.hamcrest.CoreMatchers.hasItem;11import static org.hamcrest.CoreMatchers.hasItems;12import static org.hamcrest.CoreMatchers.not;13import org.hamcrest.CustomMatcher;14import org.hamcrest.Matcher;15import static org.junit.Assert.assertThat;16import org.junit.Before;17import org.junit.Test;18/**19 *20 * @author airhacks.com21 */22public class AssertionsShowTest {23    private List<String> stringList;24    @Before25    public void init() {26        this.stringList = Arrays.asList("java", "javaee", "joker");27    }28    @Test29    public void lists() {30        assertThat(stringList, hasItem("java"));31        assertThat(stringList, hasItem("javaee"));32        assertThat(stringList, hasItems("javaee", "joker"));33        assertThat(stringList, everyItem(containsString("j")));34    }35    @Test36    public void combinableMathers() {37        assertThat(stringList, both(hasItem("java")).and(hasItem("javaee")));38        assertThat(stringList, either(hasItem("java")).or(hasItem("javascript")));39        assertThat(stringList, anyOf(hasItem("javascript"), hasItem("javaee")));40        assertThat(stringList, allOf(hasItem("java"), not(hasItem("erlang"))));41    }42    @Test43    public void customMatcher() {44        Matcher<String> containsJ = new CustomMatcher<String>("contains j") {45            @Override46            public boolean matches(Object item) {47                if (!(item instanceof String)) {48                    return false;49                }50                String content = (String) item;51                return content.contains("j");52            }53        };54        assertThat("java", containsJ);55    }56}...

Source:AssertThatTest.java

...36    @Test37    public void assertThat_customMatcher() {38        final String expected = "expected";39        final String actual = "actual";40        final CustomMatcher customMatcher = new CustomMatcher(expected);41        assertThat(actual, is(customMatcher));42    }43    public static class CustomMatcher extends TypeSafeMatcher<String> {44        private final String expected;45        public CustomMatcher(String expected) {46            this.expected = expected;47        }48        @Override49        protected boolean matchesSafely(String item) {50            return expected.equals(item);51        }52        @Override53        public void describeTo(Description description) {54            description.appendValue(expected);55        }56    }57}...

Source:VersionMatcherRule.java

...15 */16package org.jetbrains.plugins.gradle;17import org.gradle.util.GradleVersion;18import org.hamcrest.CoreMatchers;19import org.hamcrest.CustomMatcher;20import org.hamcrest.Matcher;21import org.jetbrains.annotations.NotNull;22import org.jetbrains.annotations.Nullable;23import org.jetbrains.plugins.gradle.tooling.annotation.TargetVersions;24import org.jetbrains.plugins.gradle.tooling.util.VersionMatcher;25import org.junit.rules.TestWatcher;26import org.junit.runner.Description;27/**28* @author Vladislav.Soroka29* @since 11/27/201430*/31public class VersionMatcherRule extends TestWatcher {32  @Nullable33  private CustomMatcher myMatcher;34  @NotNull35  public Matcher getMatcher() {36    return myMatcher != null ? myMatcher : CoreMatchers.anything();37  }38  @Override39  protected void starting(Description d) {40    final TargetVersions targetVersions = d.getAnnotation(TargetVersions.class);41    if (targetVersions == null) return;42    myMatcher = new CustomMatcher<String>("Gradle version '" + targetVersions.value() + "'") {43      @Override44      public boolean matches(Object item) {45        return item instanceof String && new VersionMatcher(GradleVersion.version(item.toString())).isVersionMatch(targetVersions);46      }47    };48  }49}

Source:TestHelper.java

1package com.googlecode.junittoolbox;23import org.hamcrest.CustomMatcher;4import org.hamcrest.Matcher;5import org.junit.runner.Runner;6import org.junit.runners.ParentRunner;7import org.junit.runners.model.FrameworkMethod;89import java.lang.reflect.Method;10import java.util.List;1112import static org.hamcrest.Matchers.*;1314public class TestHelper {1516    static List<?> getChildren(Runner runner) throws Exception {17        Method getFilteredChildren = ParentRunner.class.getDeclaredMethod("getFilteredChildren");18        getFilteredChildren.setAccessible(true);19        return (List<?>) getFilteredChildren.invoke(runner);20    }2122    static Matcher<Iterable<?>> hasItemWithTestClass(Class<?> testClass) {23        // noinspection unchecked24        return hasItem(withTestClass(testClass));25    }2627    private static Matcher withTestClass(final Class<?> testClass) {28        return new CustomMatcher("with test class " + testClass.getName()) {29            @Override30            public boolean matches(Object item) {31                return item instanceof Runner32                       && testClass.equals(((Runner) item).getDescription().getTestClass());33            }34        };35    }3637    static Matcher<Iterable<?>> hasItemWithTestMethod(String methodName) {38        // noinspection unchecked39        return hasItem(withTestMethod(methodName));40    }4142    private static Matcher withTestMethod(final String methodName) {43        return new CustomMatcher("with test method " + methodName) {44            @Override45            public boolean matches(Object item) {46                return item instanceof FrameworkMethod47                       && methodName.equals(((FrameworkMethod) item).getName());48            }49        };50    }51}
...

Source:CustomTypeSafeMatcherTest.java

1package org.hamcrest;2import org.junit.Test;3import static org.hamcrest.AbstractMatcherTest.*;4public final class CustomTypeSafeMatcherTest {5    private static final String STATIC_DESCRIPTION = "I match non empty strings";6    private final Matcher<String> customMatcher = new CustomTypeSafeMatcher<String>(STATIC_DESCRIPTION) {7        @Override8        public boolean matchesSafely(String item) {9            return false;10        }11        @Override12        public void describeMismatchSafely(String item, Description mismatchDescription) {13            mismatchDescription.appendText("an " + item);14        }15    };16    @Test public void17    usesStaticDescription() throws Exception {18        assertDescription(STATIC_DESCRIPTION, customMatcher);19    }20    @Test public void21    reportsMismatch() {22        assertMismatchDescription("an item", customMatcher, "item");23    }24    @Test public void25    isNullSafe() {26        assertNullSafe(customMatcher);27    }28    29    @Test public void30    copesWithUnknownTypes() {31        assertUnknownTypeSafe(customMatcher);32    }33}...

CustomMatcher

Using AI Code Generation

1import static org.hamcrest.CoreMatchers.anyOf;2import static org.hamcrest.CoreMatchers.is;3import static org.hamcrest.CoreMatchers.not;4import static org.hamcrest.CoreMatchers.startsWith;5import static org.hamcrest.MatcherAssert.assertThat;6import static org.hamcrest.Matchers.equalTo;7import static org.hamcrest.Matchers.equalToIgnoringCase;8import static org.hamcrest.Matchers.hasItem;9import static org.hamcrest.Matchers.hasItems;10import static org.hamcrest.Matchers.hasSize;11import static org.hamcrest.Matchers.not;12import static org.hamcrest.Matchers.nullValue;13import java.util.Arrays;14import java.util.List;15import org.hamcrest.CoreMatchers;16import org.hamcrest.Matcher;17import org.hamcrest.core.CombinableMatcher;18public class HamcrestMatchersExample {19    public static void main(String[] args) {20        assertThat(1, is(1));21        assertThat(1, equalTo(1));22        assertThat(1, equalToIgnoringCase("1"));23        assertThat(1, not(2));24        assertThat(1, not(equalTo(2)));25        assertThat(null, nullValue());26        assertThat("abc", startsWith("a"));27        Matcher<Integer> matcher = anyOf(equalTo(1), equalTo(2), equalTo(3));28        assertThat(1, matcher);29        assertThat(2, matcher);30        assertThat(3, matcher);31        Matcher<Integer> matcher2 = allOf(equalTo(1), equalTo(1), equalTo(1));32        assertThat(1, matcher2);33        Matcher<Integer> matcher3 = not(anyOf(equalTo(1), equalTo(2), equalTo(3)));34        assertThat(4, matcher3);35        Matcher<Integer> matcher4 = not(allOf(equalTo(1), equalTo(1), equalTo(1)));36        assertThat(2, matcher4);37        List<Integer> list = Arrays.asList(1, 2, 3);38        assertThat(list, hasSize(3));39        assertThat(list, hasItem(1));40        assertThat(list, hasItems(1, 2));41        String str = "foobar";42        assertThat(str, new CustomMatcher("foo"));43    }44}

CustomMatcher

Using AI Code Generation

1import org.hamcrest.CustomMatcher;2import org.hamcrest.StringDescription;3import org.hamcrest.Description;4import org.hamcrest.BaseMatcher;5import org.hamcrest.Matcher;6public class CustomMatcherTest {7    public static void main(String[] args) {8        Matcher<String> matcher = new CustomMatcher<String>("Custom Matcher") {9            public boolean matches(Object item) {10                return item.equals("Hello World");11            }12        };13        StringDescription description = new StringDescription();14        Description desc = description.appendText("Hello World");15        BaseMatcher<String> baseMatcher = new BaseMatcher<String>() {16            public boolean matches(Object item) {17                return item.equals("Hello World");18            }19            public void describeTo(Description description) {20                description.appendText("Hello World");21            }22        };23        Matcher<String> matcher1 = baseMatcher;24        StringDescription description1 = new StringDescription();25        Matcher<String> matcher2 = baseMatcher;26        StringDescription description2 = new StringDescription();27        Matcher<String> matcher3 = baseMatcher;28        StringDescription description3 = new StringDescription();29        Matcher<String> matcher4 = baseMatcher;30        StringDescription description4 = new StringDescription();31        Matcher<String> matcher5 = baseMatcher;32        StringDescription description5 = new StringDescription();

CustomMatcher

Using AI Code Generation

1import org.hamcrest.CustomMatcher;2import org.hamcrest.Matcher;3import org.hamcrest.Matchers;4import org.junit.Test;5import java.util.Arrays;6import java.util.List;7import static org.hamcrest.Matchers.*;8import static org.junit.Assert.assertThat;9public class CustomMatcherTest {10    public void testCustomMatcher(){11        List<String> list = Arrays.asList("one", "two", "three");12        assertThat(list, hasItems("one", "two", "three"));13        Matcher<String> matcher = new CustomMatcher<String>("String containing 'two'") {14            public boolean matches(Object o) {15                return o.toString().contains("two");16            }17        };18        assertThat(list, hasItems(matcher));19    }20}

CustomMatcher

Using AI Code Generation

1import static org.hamcrest.MatcherAssert.assertThat;2import static org.hamcrest.Matchers.*;3public class CustomMatcherDemo {4    public static void main(String[] args) {5        assertThat("Hello World", startsWith("Hello"));6        assertThat("Hello World", not(startsWith("World")));7        assertThat("Hello World", endsWith("World"));8        assertThat("Hello World", not(endsWith("Hello")));9    }10}

CustomMatcher

Using AI Code Generation

1assertThat("Hello", new CustomMatcher<String>("Hello") {2public boolean matches(Object item) {3return true;4}5});6assertThat("Hello", new CustomMatcher<String>("Hello") {7public boolean matches(Object item) {8return true;9}10});11assertThat("Hello", new CustomMatcher<String>("Hello") {12public boolean matches(Object item) {13return true;14}15});16assertThat("Hello", new CustomMatcher<String>("Hello") {17public boolean matches(Object item) {18return true;19}20});21assertThat("Hello", new CustomMatcher<String>("Hello") {22public boolean matches(Object item) {23return true;24}25});26assertThat("Hello", new CustomMatcher<String>("Hello") {27public boolean matches(Object item) {28return true;29}30});31assertThat("Hello", new CustomMatcher<String>("Hello") {32public boolean matches(Object item) {33return true;34}35});36assertThat("Hello", new CustomMatcher<String>("Hello") {37public boolean matches(Object item) {38return true;39}40});41assertThat("Hello", new CustomMatcher<String>("Hello") {42public boolean matches(Object item) {43return true;44}45});46assertThat("Hello", new CustomMatcher<String>("Hello") {47public boolean matches(Object item) {48return true;49}50});51assertThat("Hello", new CustomMatcher<String>("Hello") {52public boolean matches(Object item) {53return true;54}55});56assertThat("Hello", new CustomMatcher<String>("Hello") {57public boolean matches(Object item) {58return true;59}60});61assertThat("Hello", new CustomMatcher<String>("Hello") {62public boolean matches(Object item) {63return true;64}65});66assertThat("Hello", new CustomMatcher<String>("Hello") {67public boolean matches(Object item) {68return true;69}70});71assertThat("Hello", new Custom

CustomMatcher

Using AI Code Generation

1import org.hamcrest.core.Is;2import static org.hamcrest.MatcherAssert.assertThat;3import static org.hamcrest.Matchers.*;4import java.util.Arrays;5import java.util.HashMap;6import java.util.List;7import java.util.Map;8public class HamcrestMatcherExamples {9    public static void main(String[] args) {

Source: How to verify that array contains object with rest assured?

1public class Some {2    private int id;3    public int getId(){4        return this.id;5    }6    public setId( int newId ) {7        this.id = newId;8    }9}10

Source:How to verify that array contains object with rest assured?

public class Some {
    private int id;
    public int getId(){
        return this.id;
    }
    public setId( int newId ) {
        this.id = newId;
    }
}

Source: Java: How can I define an anonymous Hamcrest Matcher?

1String[] phrases = new String[10];2String keyPhrase = "Bird";3for(String phrase : phrases) {4    System.out.println(phrase.equals(keyPhrase));5}6

Source:Java: How can I define an anonymous Hamcrest Matcher?

String[] phrases = new String[10];
String keyPhrase = "Bird";
for(String phrase : phrases) {
    System.out.println(phrase.equals(keyPhrase));
}

Source: Using spring SecurityWebFilterChain how to disable/block all non-https requests except few known paths

1              Benchmark                         Mode  Cnt   Score   Error  Units2 8. ByteArrayOutputStream and read (JDK)        avgt   10   1,343 ± 0,028  us/op3 6. InputStreamReader and StringBuilder (JDK)   avgt   10   6,980 ± 0,404  us/op410. BufferedInputStream, ByteArrayOutputStream  avgt   10   7,437 ± 0,735  us/op511. InputStream.read() and StringBuilder (JDK)  avgt   10   8,977 ± 0,328  us/op6 7. StringWriter and IOUtils.copy (Apache)      avgt   10  10,613 ± 0,599  us/op7 1. IOUtils.toString (Apache Utils)             avgt   10  10,605 ± 0,527  us/op8 3. Scanner (JDK)                               avgt   10  12,083 ± 0,293  us/op9 2. CharStreams (guava)                         avgt   10  12,999 ± 0,514  us/op10 4. Stream Api (Java 8)                         avgt   10  15,811 ± 0,605  us/op11 9. BufferedReader (JDK)                        avgt   10  16,038 ± 0,711  us/op12 5. parallel Stream Api (Java 8)                avgt   10  21,544 ± 0,583  us/op13

Source:Using spring SecurityWebFilterChain how to disable/block all non-https requests except few known paths

              Benchmark                         Mode  Cnt   Score   Error  Units
 8. ByteArrayOutputStream and read (JDK)        avgt   10   1,343 ± 0,028  us/op
 6. InputStreamReader and StringBuilder (JDK)   avgt   10   6,980 ± 0,404  us/op
10. BufferedInputStream, ByteArrayOutputStream  avgt   10   7,437 ± 0,735  us/op
11. InputStream.read() and StringBuilder (JDK)  avgt   10   8,977 ± 0,328  us/op
 7. StringWriter and IOUtils.copy (Apache)      avgt   10  10,613 ± 0,599  us/op
 1. IOUtils.toString (Apache Utils)             avgt   10  10,605 ± 0,527  us/op
 3. Scanner (JDK)                               avgt   10  12,083 ± 0,293  us/op
 2. CharStreams (guava)                         avgt   10  12,999 ± 0,514  us/op
 4. Stream Api (Java 8)                         avgt   10  15,811 ± 0,605  us/op
 9. BufferedReader (JDK)                        avgt   10  16,038 ± 0,711  us/op
 5. parallel Stream Api (Java 8)                avgt   10  21,544 ± 0,583  us/op

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Assertions in JUnit - Assertions are used to validate or test that the result of an action/functionality is the same as expected. Learn in detail what assertions are and how to use them while performing JUnit testing.
Parameterization in JUnit - Parameterized Test enables you to run the same automated test scripts with different variables. By collecting data on each method's test parameters, you can minimize time spent on writing tests. Learn how to use parameterization in JUnit.
Nested Tests In JUnit 5 - A nested class is a non-static class contained within another class in a hierarchical structure. It can share the state and setup of the outer class. Learn about nested annotations in JUnit 5 with examples.
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