How to use describeMismatch method of org.hamcrest.BaseMatcher class

Best junit code snippet using org.hamcrest.BaseMatcher.describeMismatch

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...49 public void describeTo(Description description) {50 description.appendText("file that exists");51 }52 @Override53 public void describeMismatch(Object item, Description description) {54 if (item instanceof File) {55 description.appendValue(item);56 description.appendText(" does not exist");57 } else {58 description.appendValue(item);59 description.appendText(" was not a File object");60 }61 }62 };63 }64 /​** Matcher for a regular (non-directory) file */​65 public static Matcher<File> file() {66 return new BaseMatcher<File>() {67 @Override68 public boolean matches(Object item) {69 if (item instanceof File) {70 return ((File) item).isFile();71 } else {72 return false;73 }74 }75 @Override76 public void describeTo(Description description) {77 description.appendText("file that is a file (Not a directory)");78 }79 @Override80 public void describeMismatch(Object item, Description description) {81 if (item instanceof File) {82 if (((File) item).exists()) {83 description.appendValue(item);84 description.appendText(" is a directory");85 } else {86 description.appendValue(item);87 description.appendText(" does not exist");88 }89 } else {90 description.appendValue(item);91 description.appendText(" was not a File object");92 }93 }94 };95 }96 /​** Matcher for a directory */​97 public static Matcher<File> directory() {98 return new BaseMatcher<File>() {99 @Override100 public boolean matches(Object item) {101 if (item instanceof File) {102 return ((File) item).isDirectory();103 } else {104 return false;105 }106 }107 @Override108 public void describeTo(Description description) {109 description.appendText("file that is a directory");110 }111 @Override112 public void describeMismatch(Object item, Description description) {113 if (item instanceof File) {114 if (((File) item).exists()) {115 description.appendValue(item);116 description.appendText(" is not a directory");117 } else {118 description.appendValue(item);119 description.appendText(" does not exist");120 }121 } else {122 description.appendValue(item);123 description.appendText(" was not a File object");124 }125 }126 };127 }128 /​** Matcher for a directory's contents */​129 public static Matcher<File> directoryContaining(Matcher<Iterable<File>> filesMatcher) {130 return new BaseMatcher<File>() {131 @Override132 public boolean matches(Object item) {133 if (item instanceof File) {134 return ((File) item).isDirectory()135 && filesMatcher.matches(Arrays.asList(((File) item).listFiles()));136 } else {137 return false;138 }139 }140 @Override141 public void describeTo(Description description) {142 description.appendText("directory that contains ");143 description.appendDescriptionOf(filesMatcher);144 }145 @Override146 public void describeMismatch(Object item, Description description) {147 if (!(item instanceof File)) {148 description.appendValue(item);149 description.appendText(" was not a File object");150 } else if (!((File) item).exists()) {151 description.appendValue(item);152 description.appendText(" does not exist");153 } else if (!((File) item).isDirectory()) {154 description.appendValue(item);155 description.appendText(" is not a directory");156 } else {157 description.appendValue(item);158 description.appendText(" had files ");159 filesMatcher.describeMismatch(((File) item).listFiles(), description);160 }161 }162 };163 }164 public static Matcher<File> directoryEmpty() {165 return directoryContaining(Matchers.emptyIterableOf(File.class));166 }167 /​** Matcher for last modified time */​168 public static Matcher<File> lastModified(final Matcher<Long> timeMatcher) {169 return new BaseMatcher<File>() {170 @Override171 public boolean matches(Object item) {172 if (item instanceof File) {173 return timeMatcher.matches(((File) item).lastModified());174 } else {175 return false;176 }177 }178 @Override179 public void describeTo(Description description) {180 description.appendText("file last modified ");181 description.appendDescriptionOf(timeMatcher);182 }183 @Override184 public void describeMismatch(Object item, Description description) {185 if (item instanceof File) {186 if (((File) item).exists()) {187 description.appendValue(item);188 description.appendText(" had modification time ");189 timeMatcher.describeMismatch(((File) item).lastModified(), description);190 } else {191 description.appendValue(item);192 description.appendText(" does not exist");193 }194 } else {195 description.appendValue(item);196 description.appendText(" was not a File object");197 }198 }199 };200 }201 /​** Matcher for file with a particular name */​202 @SuppressWarnings("unchecked")203 public static Matcher<File> named(String name) {204 return both(instanceOf(File.class)).and((Matcher) hasProperty("name", equalTo(name)));205 }206 /​**207 * Executes the given {@link Callable} and then returns a matcher for values of {@link208 * System#currentTimeMillis()} during the execution.209 */​210 public static Matcher<Long> whileRunning(Callable<Void> stuffToDo) throws Exception {211 final long start = System.currentTimeMillis();212 stuffToDo.call();213 final long end = System.currentTimeMillis();214 return both(greaterThan(start)).and(lessThan(end));215 }216 public static Matcher<Resource> resource(final Resource expected) {217 return new BaseMatcher<Resource>() {218 @Override219 public boolean matches(Object item) {220 if (item instanceof Resource) {221 try (InputStream itemStream = ((Resource) item).getInputStream();222 InputStream expectedStream = expected.getInputStream(); ) {223 return IOUtils.contentEquals(itemStream, expectedStream);224 } catch (IOException e) {225 return false;226 }227 } else {228 return false;229 }230 }231 @Override232 public void describeTo(Description description) {233 description.appendText("Resource with content equal to that given");234 }235 @Override236 public void describeMismatch(Object item, Description description) {237 if (item instanceof Resource) {238 description.appendText("did not match given Resource");239 } else {240 description.appendText("was not a Resource");241 }242 }243 };244 }245}...

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...46 private class IntMatcherFromInterface extends BaseMatcher<Integer> {47 public boolean matches(Object o) {48 return true;49 }50 public void describeMismatch(Object item, Description mismatchDescription) {}51 public void describeTo(Description description) {}52 }53 /​/​Static Matcher interface implementation (instead of the BaseMatcher)54 private static class StaticIntMatcherFromInterface extends BaseMatcher<Integer> {55 public boolean matches(Object o) {56 return true;57 }58 public void describeMismatch(Object item, Description mismatchDescription) {}59 public void describeTo(Description description) {}60 }61 /​/​non-generic matcher implementing the interface62 @SuppressWarnings("rawtypes")63 private static class NonGenericMatcherFromInterface extends BaseMatcher {64 public boolean matches(Object o) {65 return true;66 }67 public void describeMismatch(Object item, Description mismatchDescription) {}68 public void describeTo(Description description) {}69 }70 private interface IMatcher extends Matcher<Integer> {}71 /​/​non-generic matcher implementing the interface72 private static class SubclassGenericMatcherFromInterface extends BaseMatcher<Integer> implements Serializable, Cloneable, IMatcher {73 public boolean matches(Object o) {74 return true;75 }76 public void describeMismatch(Object item, Description mismatchDescription) {}77 public void describeTo(Description description) {}78 }79 /​/​I refuse to comment on the sanity of this case80 private static class InsaneEdgeCase extends SubclassGenericMatcherFromInterface {}81 @Test82 public void findsGenericType() {83 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcher.class));84 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcher.class));85 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcherFromInterface.class));86 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcherSubclass.class));87 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcherFromInterface.class));88 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcherFromInterface.class));89 assertEquals(Integer.class, genericTypeOfMatcher(SubclassGenericMatcherFromInterface.class));90 assertEquals(Integer.class, genericTypeOfMatcher(InsaneEdgeCase.class));91 assertEquals(Integer.class, genericTypeOfMatcher(new BaseMatcher<Integer>() {92 public void describeTo(Description description) {93 }94 public boolean matches(Object o) {95 return false;96 }97 }.getClass()));98 assertEquals(Integer.class, genericTypeOfMatcher(new BaseMatcher<Integer>() {99 public void describeTo(Description description) {100 }101 public boolean matches(Object o) {102 return false;103 }104 public void describeMismatch(Object item, Description mismatchDescription) {105 }106 }.getClass()));107 assertEquals(Object.class, genericTypeOfMatcher(Object.class));108 assertEquals(Object.class, genericTypeOfMatcher(String.class));109 assertEquals(Object.class, genericTypeOfMatcher(HashMap.class));110 assertEquals(Object.class, genericTypeOfMatcher(new HashMap<String, String>() {111 }.getClass()));112 assertEquals(Object.class, genericTypeOfMatcher(NonGenericMatcher.class));113 assertEquals(Object.class, genericTypeOfMatcher(NonGenericMatcherFromInterface.class));114 }115}...

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...47 description.appendText(currentTime.toString());48 }4950 @Override51 public void describeMismatch(Object item, Description description) {52 Date date = (Date) item;53 description54 .appendText(Long.toString(date.getTime()))55 .appendText(" (").appendText(Long.toString(abs(date.getTime() - currentTime)))56 .appendText(" ms)");57 }58 };59 }6061 public static org.hamcrest.Matcher<Long> equalToWithin(long expectedValue, long precision) {62 return new BaseMatcher<Long>() {6364 @Override65 public boolean matches(Object item) {66 Long value = (Long) item;67 long difference = value - expectedValue;68 return abs(difference) <= precision;69 }7071 @Override72 public void describeTo(Description description) {73 description.appendText(Long.toString(expectedValue));74 }7576 @Override77 public void describeMismatch(Object item, Description description) {78 Long value = (Long) item;79 description80 .appendText(Long.toString(value))81 .appendText(" (").appendText(Long.toString(abs(value - expectedValue)))82 .appendText(")");83 }84 };85 }8687 public static <T> org.hamcrest.Matcher<Observable<T>> hasOnlyOneItem() {88 return hasOnlyOneItem(null, item -> true);89 }9091 @SuppressWarnings("WeakerAccess")92 public static <T> org.hamcrest.Matcher<Observable<T>> hasOnlyOneItem(String descr, Func1<? super T, Boolean> predicate) {93 return new BaseMatcher<Observable<T>>() {94 @Override95 public boolean matches(Object item) {96 List<T> list = getList(item);97 System.out.println(list);98 return list.size() == 1;99 }100101 @Override102 public void describeTo(Description description) {103 description.appendText("only one item");104 if (descr != null)105 description.appendText(" ").appendText(descr);106 }107108 @Override109 public void describeMismatch(Object item, Description description) {110 List<T> list = getList(item);111 description.appendText(list.toString());112 }113114 private List<T> getList(Object item) {115 /​/​noinspection unchecked116 Observable<T> observable = (Observable<T>) item;117 return observable.filter(predicate).toList().toBlocking().single();118 }119 };120 }121} ...

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...39 description.appendText("Path should exist");40 }41 42 @Override43 public void describeMismatch(Object item, Description description)44 {45 description.appendText("Path did not exist ").appendValue(item);46 }47 };48 }49 50 public static Matcher<Path> notPathExists()51 {52 return new BaseMatcher<Path>()53 {54 @Override55 public boolean matches(Object item)56 {57 final Path path = (Path)item;58 return !Files.exists(path);59 }60 @Override61 public void describeTo(Description description)62 {63 description.appendText("Path should not exist");64 }65 66 @Override67 public void describeMismatch(Object item, Description description)68 {69 description.appendText("Path exists ").appendValue(item);70 }71 };72 }73 74 public static Matcher<Path> fileExists()75 {76 return new BaseMatcher<Path>()77 {78 @Override79 public boolean matches(Object item)80 {81 final Path path = (Path)item;82 return Files.exists(path) && Files.isRegularFile(path);83 }84 @Override85 public void describeTo(Description description)86 {87 description.appendText("File should exist");88 }89 90 @Override91 public void describeMismatch(Object item, Description description)92 {93 description.appendText("File did not exist ").appendValue(item);94 }95 };96 }97}

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...30 description.appendText(this.descriptionTemplate.substring(textStart));31 }32 }33 @Override /​/​ org.hamcrest.BaseMatcher, org.hamcrest.Matcher34 public void describeMismatch(Object item, Description description) {35 this.matcher.describeMismatch(item, description);36 }37 public static <T> Matcher<T> describedAs(String description, Matcher<T> matcher2, Object... values2) {38 return new DescribedAs(description, matcher2, values2);39 }40}...

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...14 protected TypeSafeMatcher(ReflectiveTypeFinder typeFinder) {15 this.expectedType = typeFinder.findExpectedType(getClass());16 }17 /​* access modifiers changed from: protected */​18 public void describeMismatchSafely(T item, Description mismatchDescription) {19 super.describeMismatch(item, mismatchDescription);20 }21 @Override /​/​ org.hamcrest.Matcher22 public final boolean matches(Object item) {23 return item != null && this.expectedType.isInstance(item) && matchesSafely(item);24 }25 @Override /​/​ org.hamcrest.BaseMatcher, org.hamcrest.Matcher26 public final void describeMismatch(Object item, Description description) {27 if (item == null) {28 super.describeMismatch(null, description);29 } else if (!this.expectedType.isInstance(item)) {30 description.appendText("was a ").appendText(item.getClass().getName()).appendText(" (").appendValue(item).appendText(")");31 } else {32 describeMismatchSafely(item, description);33 }34 }35}...

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...12 public boolean matches(Object o) {13 return ((Map) o).isEmpty();14 }15 @Override16 public void describeMismatch(Object item, Description description) {17 super.describeMismatch(mapSizeMessage(item), description);18 }19 @Override20 public void describeTo(Description description) {21 description.appendText("Empty Map");22 }23 };24 }25 public static <K, V> org.hamcrest.Matcher<Map<K, V>> mapWithSize(final int size) {26 return new BaseMatcher<Map<K, V>>() {27 @Override28 public boolean matches(Object o) {29 return ((Map) o).size() == size;30 }31 @Override32 public void describeMismatch(Object item, Description description) {33 super.describeMismatch(mapSizeMessage(item), description);34 }35 @Override36 public void describeTo(Description description) {37 description.appendText("Map with size " + size);38 }39 };40 }41 private static String mapSizeMessage(Object item) {42 return "Map with size " + ((Map) item).size() + ": " + item;43 }44}...

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Source: Is.java Github

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...15 public void describeTo(Description description) {16 description.appendText("is ").appendDescriptionOf(this.matcher);17 }18 @Override /​/​ org.hamcrest.BaseMatcher, org.hamcrest.Matcher19 public void describeMismatch(Object item, Description mismatchDescription) {20 this.matcher.describeMismatch(item, mismatchDescription);21 }22 public static <T> Matcher<T> is(Matcher<T> matcher2) {23 return new Is(matcher2);24 }25 public static <T> Matcher<T> is(T value) {26 return is(IsEqual.equalTo(value));27 }28 public static <T> Matcher<T> isA(Class<T> type) {29 return is((Matcher) IsInstanceOf.instanceOf(type));30 }31}...

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describeMismatch

Using AI Code Generation

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1org.hamcrest.BaseMatcher.describeMismatch(Object item, Description description)2org.hamcrest.BaseMatcher.describeTo(Description description)3org.hamcrest.BaseMatcher.matches(Object item)4org.hamcrest.BaseMatcher.toString()5org.hamcrest.BaseMatcher.wrapMatcher(org.hamcrest.Matcher matcher)6org.hamcrest.BaseMatcher.wrapMatcher(java.lang.String description, org.hamcrest.Matcher matcher)7org.hamcrest.BaseMatcher.wrapMatcher(java.lang.String description, org.hamcrest.SelfDescribing value, org.hamcrest.Matcher matcher)8org.hamcrest.BaseMatcher.wrapMismatchDescription(java.lang.String description, org.hamcrest.SelfDescribing value, org.hamcrest.SelfDescribing mismatchDescription)9org.hamcrest.BaseMatcher.wrapValueDescription(java.lang.String description, org.hamcrest.SelfDescribing value)10org.hamcrest.BaseMatcher.wrapValueWithIsEqualTo(java.lang.Object value)11org.hamcrest.BaseMatcher.wrapValueWithIsSame(java.lang.Object value)12org.hamcrest.BaseMatcher.wrapWithIsEqual(java.lang.Object value)13org.hamcrest.BaseMatcher.wrapWithIsSame(java.lang.Object value)14org.hamcrest.BaseMatcher.wrapWithIs(java.lang.String description, org.hamcrest.SelfDescribing value)15org.hamcrest.BaseMatcher.wrapWithIs(java.lang.String description, org.hamcrest.SelfDescribing value, org.hamcrest.Matcher matcher)16org.hamcrest.BaseMatcher.wrapWithIsNot(java.lang.String description, org.hamcrest.SelfDescribing value, org.hamcrest.Matcher matcher)17org.hamcrest.BaseMatcher.wrapWithNot(org.hamcrest.Matcher matcher)

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describeMismatch

Using AI Code Generation

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1package com.zetcode;2import org.hamcrest.BaseMatcher;3import org.hamcrest.Description;4import org.hamcrest.Matcher;5public class JavaMatcher extends BaseMatcher {6 private final int expected;7 public JavaMatcher(int expected) {8 this.expected = expected;9 }10 public boolean matches(Object actual) {11 return actual.equals(expected);12 }13 public void describeTo(Description desc) {14 desc.appendText(String.valueOf(expected));15 }16 public void describeMismatch(Object actual, Description desc) {17 desc.appendText("was ").appendText(String.valueOf(actual));18 }19 public static Matcher<Integer> isJava(int expected) {20 return new JavaMatcher(expected);21 }22}23package com.zetcode;24import org.junit.Test;25import static org.junit.Assert.*;26public class JavaMatcherTest {27 public void testJavaMatcher() {28 int actual = 8;29 int expected = 8;30 assertThat(actual, JavaMatcher.isJava(expected));31 }32}

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How should I test private methods in Java?

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You should not need to test private methods.

  • A private method is specifically part of the implementation. You should not test the implemenation, but the functionality. If you test the functionality a class exposes, you can change the implementation while depending on the unit test.
  • If you feel the need to test a private method, this is a good sign that you should move the private method to another class and make the method public. By doing this, you get smaller classes and you can test the methods easily. If you do not want to expose this new class, you can make it package-private (the default access modifier).
https://stackoverflow.com/questions/3299405/how-should-i-test-private-methods-in-java

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