How to use describeTo method of org.hamcrest.core.IsNull class

Best junit code snippet using org.hamcrest.core.IsNull.describeTo

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...60 public boolean matchesSafely(T item) {61 return compareTo.compareTo(item) <= 0;62 }63 64 public void describeTo(Description description) {65 description.appendText("a value greater than ");66 description.appendValue(compareTo);67 }68 }69 70 public class IsLessThan<T extends Comparable<T>> extends TypeSafeMatcher<T> {71 private final Comparable<T> compareTo;72 73 public IsLessThan(Comparable<T> compareTo) {74 this.compareTo = compareTo;75 }76 77 public boolean matchesSafely(T item) {78 return compareTo.compareTo(item) > 0;79 }80 81 public void describeTo(Description description) {82 description.appendText("a value greater than ");83 description.appendValue(compareTo);84 }85 }86}...

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...29 }30 return false;31 }32 @Override33 public void describeTo(Description description) {34 description.appendText("map containing unique entry [");35 keyMatcher.describeTo(description);36 description.appendText("->");37 valueMatcher.describeTo(description);38 description.appendText("]");39 }40 41 @Factory42 public static Matcher<Map<?, ?>> hasSingleEntry(Matcher<?> keyMatcher, Matcher<?> valueMatcher){43 return new IsMapContainingSingleton(keyMatcher, valueMatcher);44 }45 46 @Factory47 public static Matcher<Map<?, ?>> hasSingleEntry(Entry<?, ?> entry){48 return hasSingleEntry(entry.getKey(), entry.getValue());49 }50 51 @Factory...

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...17/​* 17 */​ return (o == null);18/​* */​ }19/​* */​ 20/​* */​ 21/​* */​ public void describeTo(Description description) {22/​* 22 */​ description.appendText("null");23/​* */​ }24/​* */​ 25/​* */​ 26/​* */​ 27/​* */​ 28/​* */​ 29/​* */​ 30/​* */​ 31/​* */​ 32/​* */​ @Factory33/​* */​ public static Matcher<Object> nullValue() {34/​* 34 */​ return (Matcher<Object>)new IsNull();35/​* */​ }...

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describeTo

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1org.hamcrest.core.IsNull.nullValue()2org.hamcrest.core.IsNull.nullValue(java.lang.Class)3org.hamcrest.core.IsNull.nullValue(java.lang.Class<java.lang.Object>)4org.hamcrest.core.IsNull.nullValue(java.lang.Class<java.lang.Object>,java.lang.String)5org.hamcrest.core.IsNull.nullValue(java.lang.String)6org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String)7org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String)8org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String)9org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)10org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)11org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)12org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)13org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)14org.hamcrest.core.IsNull.nullValue(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String

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describeTo

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1import static org.hamcrest.CoreMatchers.is2import static org.hamcrest.CoreMatchers.notNullValue3import static org.hamcrest.CoreMatchers.nullValue4import static org.hamcrest.MatcherAssert.assertThat5import static org.hamcrest.Matchers.*6import static org.hamcrest.core.IsNull.nullValue7import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString8import static org.hamcrest.text.IsEqualIgnoringCase.equalToIgnoringCase9import static org.hamcrest.text.IsEqualIgnoringWhiteSpace.equalToIgnoringWhiteSpace10import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder11import static org.hamcrest.text.StringEndsWith.endsWith12import static org.hamcrest.text.StringStartsWith.startsWith13import static org.hamcrest.text.StringContains.containsString14import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder15import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString16import static org.hamcrest.text.IsEqualIgnoringCase.equalToIgnoringCase17import static org.hamcrest.text.IsEqualIgnoringWhiteSpace.equalToIgnoringWhiteSpace18import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder19import static org.hamcrest.text.StringEndsWith.endsWith20import static org.hamcrest.text.StringStartsWith.startsWith21import static org.hamcrest.text.StringContains.containsString22import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder23import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString24import static org.hamcrest.text.IsEqualIgnoringCase.equalToIgnoringCase25import static org.hamcrest.text.IsEqualIgnoringWhiteSpace.equalToIgnoringWhiteSpace26import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder27import static org.hamcrest.text.StringEndsWith.endsWith28import static org.hamcrest.text.StringStartsWith.startsWith29import static org.hamcrest.text.StringContains.containsString30import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder31import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString32import static org.hamcrest.text.IsEqualIgnoringCase.equalToIgnoringCase33import static org.hamcrest.text.IsEqualIgnoringWhiteSpace.equalToIgnoringWhiteSpace34import static org.hamcrest.text.StringContainsInOrder.stringContainsInOrder35import static org.hamcrest.text.StringEndsWith.endsWith36import static org.hamcrest.text.StringStartsWith.startsWith37import static org.hamcrest.text.StringContains.containsString38def "Hamcrest text matchers"() {39 text.contains("test")40 text.startsWith("This")41 text.endsWith("test")42 text.startsWith("This") && text.endsWith("test")43 text.startsWith("This") || text.endsWith

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describeTo

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1public class IsNullTest {2 public void testIsNull() {3 assertThat(null, is(nullValue()));4 }5}6public class IsNullTest {7 public void testIsNull() {8 assertThat(null, is(nullValue()));9 }10}11public class IsNullTest {12 public void testIsNull() {13 assertThat(null, is(nullValue()));14 }15}16public class IsNullTest {17 public void testIsNull() {18 assertThat(null, is(nullValue()));19 }20}21public class IsNullTest {22 public void testIsNull() {23 assertThat(null, is(nullValue()));24 }25}26public class IsNullTest {27 public void testIsNull() {28 assertThat(null, is(nullValue()));29 }30}31public class IsNullTest {32 public void testIsNull() {33 assertThat(null, is(nullValue()));34 }35}36public class IsNullTest {37 public void testIsNull() {38 assertThat(null, is(nullValue()));39 }40}41public class IsNullTest {42 public void testIsNull() {43 assertThat(null, is(nullValue()));44 }45}46public class IsNullTest {47 public void testIsNull() {48 assertThat(null, is(nullValue()));49 }50}51public class IsNullTest {52 public void testIsNull() {53 assertThat(null, is(nullValue()));54 }55}56public class IsNullTest {57 public void testIsNull() {58 assertThat(null, is(nullValue()));59 }60}

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describeTo

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1import org.hamcrest.core.IsNull;2import org.hamcrest.Description;3import org.hamcrest.StringDescription;4import org.hamcrest.MatcherAssert;5import org.hamcrest.Matcher;6public class IsNullTest {7 public static void main(String[] args) {8 MatcherAssert.assertThat(null, new IsNull<String>());9 MatcherAssert.assertThat("Hello World", new IsNull<String>());10 }11}12 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)13 at IsNullTest.main(IsNullTest.java:13)

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describeTo

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1import org.hamcrest.core.IsNull2class MyTest {3 fun test() {4 assertThat(null, IsNull())5 }6}7import org.hamcrest.core.IsNull8class MyTest {9 fun test() {10 assertThat(null, IsNull())11 }12}13import org.hamcrest.core.IsNull14class MyTest {15 fun test() {16 assertThat(null, IsNull())17 }18}19import org.hamcrest.core.IsNull20class MyTest {21 fun test() {22 assertThat(null, IsNull())23 }24}25import org.hamcrest.core.IsNull26class MyTest {27 fun test() {28 assertThat(null, IsNull())29 }30}31import org.hamcrest.core.IsNull32class MyTest {33 fun test() {34 assertThat(null, IsNull())35 }36}37import org.hamcrest.core.IsNull38class MyTest {39 fun test() {40 assertThat(null, IsNull())41 }42}43import org.hamcrest.core.IsNull44class MyTest {45 fun test() {46 assertThat(null, IsNull())47 }48}49import org.hamcrest.core.IsNull50class MyTest {51 fun test() {52 assertThat(null, IsNull())53 }54}55import org.hamcrest.core.IsNull56class MyTest {57 fun test() {58 assertThat(null, IsNull())59 }60}61import org.hamcrest.core.IsNull62class MyTest {63 fun test() {64 assertThat(null, Is

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describeTo

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1import static org.hamcrest.CoreMatchers.nullValue;2import static org.hamcrest.MatcherAssert.assertThat;3import org.hamcrest.Description;4import org.hamcrest.TypeSafeMatcher;5public class NullValueMatcher extends TypeSafeMatcher<Object> {6 public void describeTo(Description description) {7 description.appendText("null");8 }9 protected boolean matchesSafely(Object item) {10 return item == null;11 }12 public static NullValueMatcher nullValue() {13 return new NullValueMatcher();14 }15}16import static org.hamcrest.CoreMatchers.nullValue;17import static org.hamcrest.MatcherAssert.assertThat;18import org.hamcrest.Description;19import org.hamcrest.TypeSafeMatcher;20public class NullValueMatcher extends TypeSafeMatcher<Object> {21 public void describeTo(Description description) {22 description.appendText("null");23 }24 protected boolean matchesSafely(Object item) {25 return item == null;26 }27 public static NullValueMatcher nullValue() {28 return new NullValueMatcher();29 }30}31import static org.hamcrest.CoreMatchers.nullValue;32import static org.hamcrest.MatcherAssert.assertThat;33import org.hamcrest.Description;34import org.hamcrest.TypeSafeMatcher;35public class NullValueMatcher extends TypeSafeMatcher<Object> {36 public void describeTo(Description description) {37 description.appendText("null");38 }39 protected boolean matchesSafely(Object item) {40 return item == null;41 }42 public static NullValueMatcher nullValue() {43 return new NullValueMatcher();44 }45}46import static org.hamcrest.CoreMatchers.nullValue;47import static org.hamcrest.MatcherAssert.assertThat;48import org.hamcrest.Description;49import org.hamcrest.TypeSafeMatcher;50public class NullValueMatcher extends TypeSafeMatcher<Object> {51 public void describeTo(Description description) {52 description.appendText("null");53 }54 protected boolean matchesSafely(Object item) {55 return item == null;56 }57 public static NullValueMatcher nullValue() {58 return new NullValueMatcher();59 }60}

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If you add in Hamcrest and JUnit4, you could do:

String x = "foo bar";
Assert.assertThat(x, CoreMatchers.containsString("foo"));

With some static imports, it looks a lot better:

assertThat(x, containsString("foo"));

The static imports needed would be:

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;
https://stackoverflow.com/questions/1092219/assertcontains-on-strings-in-junit

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