How to use describeTo method of org.hamcrest.Interface SelfDescribing class

Best junit code snippet using org.hamcrest.Interface SelfDescribing.describeTo

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...43 stringBuilder.append(s);44 return this;45 }46 public Description appendDescriptionOf(SelfDescribing selfDescribing) {47 selfDescribing.describeTo(this);48 return this;49 }50 public Description appendValue(Object o) {51 String value;52 try {53 value = String.valueOf(o);54 } catch (Throwable e) {55 value = String.format("%s@%x", o.getClass().getName(), System.identityHashCode(o));56 }57 stringBuilder.append(value);58 return this;59 }60 public <T> Description appendValueList(String start, String separator, String end, T... values) {61 return appendValueList(start, separator, end, values != null ? Arrays.asList(values) : Collections.emptyList());62 }63 public <T> Description appendValueList(String start, String separator, String end, Iterable<T> values) {64 stringBuilder.append(start);65 boolean first = true;66 for (T value : values) {67 if (!first) {68 stringBuilder.append(separator);69 }70 first = false;71 appendValue(value);72 }73 stringBuilder.append(end);74 return this;75 }76 public Description appendList(String start, String separator, String end, Iterable<? extends SelfDescribing> values) {77 stringBuilder.append(start);78 boolean first = true;79 for (SelfDescribing value : values) {80 if (!first) {81 stringBuilder.append(separator);82 }83 first = false;84 value.describeTo(this);85 }86 stringBuilder.append(end);87 return this;88 }89 /​**90 * Returns the description built up from calls to this object so far.91 * @return the description92 */​93 @Override94 public String toString() {95 return stringBuilder.toString();96 }97 /​**98 * Renders the description of a {@link SelfDescribing} to a {@link String}....

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...13 public static ClassUnlockableMatcher canBeTreatedAs(Class<?> interfaceClazz) {14 return new ClassUnlockableMatcher(interfaceClazz);15 }16 @Override17 public void describeTo(Description description) {18 description.appendText(" can unlock features of class ").appendValue(interfaceClazz.getSimpleName());19 }20 @Override21 protected void describeMismatchSafely(Class<?> item, Description mismatchDescription) {22 List<Method> conflicts = XRayInterface.xray(item).unMappable(interfaceClazz);23 if (!conflicts.isEmpty()) {24 mismatchDescription25 .appendText("cannot find following members in ")26 .appendValue(item.getSimpleName())27 .appendText(": ")28 .appendList("\n", "\n", "", describe(conflicts));29 }30 }31 private List<SelfDescribing> describe(List<Method> conflicts) {32 List<SelfDescribing> descriptions = new ArrayList<SelfDescribing>(conflicts.size());33 for (Method conflict : conflicts) {34 StringBuilder buffer = new StringBuilder();35 buffer.append(conflict.getReturnType().getSimpleName());36 buffer.append(' ');37 buffer.append(conflict.getName());38 buffer.append('(');39 Class<?>[] parameterTypes = conflict.getParameterTypes();40 if (parameterTypes.length > 0) {41 buffer.append(parameterTypes[0].getSimpleName());42 }43 for (int i = 1; i < parameterTypes.length; i++) {44 buffer.append(", ");45 buffer.append(parameterTypes[i].getSimpleName());46 }47 buffer.append(')');48 Class<?>[] exceptionTypes = conflict.getExceptionTypes();49 if (exceptionTypes.length > 0) {50 buffer.append(" throws ");51 buffer.append(exceptionTypes[0].getSimpleName());52 for (int i = 1; i < exceptionTypes.length; i++) {53 buffer.append(", ");54 buffer.append(exceptionTypes[i].getSimpleName());55 }56 }57 descriptions.add(new Signature(buffer.toString()));58 }59 return descriptions ;60 }61 @Override62 protected boolean matchesSafely(Class<?> item) {63 return XRayInterface.xray(item).unMappable(interfaceClazz).isEmpty();64 }65 private final class Signature implements SelfDescribing {66 private final String signature;67 private Signature(String signature) {68 this.signature = signature;69 }70 @Override71 public void describeTo(Description description) {72 description.appendText(signature); 73 }74 }75}...

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...6import static ru.serge2nd.test.match.MatchAssist.descriptor;7import static ru.serge2nd.test.match.MatchAssist.idDescriptor;8import static ru.serge2nd.test.match.MatchAssist.listDescriptors;9/​**10 * A mixin for {@link Matcher} builders to build the description of the matcher (picked by {@link Matcher#describeTo(Description) describeTo()}).11 * @param <Builder> the matcher builder actual type12 */​13public interface MatchDescriptorBuilder<Builder extends MatchDescriptorBuilder<? super Builder>> {14 /​** Appends the given descriptor to the end. */​15 Builder describe(SelfDescribing sd);16 /​** Appends the given descriptor to the start. */​17 Builder describeFirst(SelfDescribing sd);18 default Builder describe(String prefix, Iterable<? extends SelfDescribing> sds) { return describe(listDescriptors(prefix, sds)); }19 default Builder describeFirst(String prefix, Iterable<? extends SelfDescribing> sds) { return describeFirst(listDescriptors(prefix, sds)); }20 default Builder append(String text) { return describe(d -> d.appendText(text)); }21 default Builder append(String text, int $) { return describeFirst(d -> d.appendText(text)); }22 default Builder append(Supplier<String> text) { return describe(d -> d.appendText(text.get())); }23 default Builder append(Supplier<String> text, int $) { return describeFirst(d -> d.appendText(text.get())); }24 default Builder append(Object val) { return describe(descriptor(val)); }...

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...14 public static XRayMatcher providesFeaturesOf(Class<?> interfaceClazz) {15 return new XRayMatcher(interfaceClazz);16 }17 @Override18 public void describeTo(Description description) {19 description.appendText("can unlock features of ").appendValue(interfaceClazz);20 }21 @Override22 protected void describeMismatchSafely(Class<?> item, Description mismatchDescription) {23 List<Method> conflicts = XRayInterface.xray(item).unMappable(interfaceClazz);24 if (!conflicts.isEmpty()) {25 mismatchDescription26 .appendText("cannot map following members in ")27 .appendValue(item)28 .appendText(": ")29 .appendList("\n", "\n", "", describe(conflicts));30 }31 }32 private List<SelfDescribing> describe(List<Method> conflicts) {33 List<SelfDescribing> descriptions = new ArrayList<SelfDescribing>(conflicts.size());34 for (Method conflict : conflicts) {35 descriptions.add(new Signature(methodSignature(conflict.getName(), conflict.getReturnType(), conflict.getParameterTypes(), conflict.getExceptionTypes())));36 }37 return descriptions;38 }39 @Override40 protected boolean matchesSafely(Class<?> item) {41 return XRayInterface.xray(item).unMappable(interfaceClazz).isEmpty();42 }43 private final class Signature implements SelfDescribing {44 private final String signature;45 private Signature(String signature) {46 this.signature = signature;47 }48 @Override49 public void describeTo(Description description) {50 description.appendText(signature);51 }52 }53}...

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...3/​**4 * A description of a Matcher. A Matcher will describe itself to a description5 * which can later be used for reporting.6 *7 * @see Matcher#describeTo(Description)8 */​9public interface Description {1011 /​**12 * Appends some plain text to the description.13 */​14 Description appendText(String text);15 16 /​**17 * Appends the description of a {@link SelfDescribing} value to this description.18 */​19 Description appendDescriptionOf(SelfDescribing value);20 21 /​** ...

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1package org.hamcrest;23public abstract interface SelfDescribing4{5 public abstract void describeTo(Description paramDescription);6}78 9/​* Location: G:\ParasiteTrade\Parasite_20150226.jar 10 * Qualified Name: org.hamcrest.SelfDescribing 11 * JD-Core Version: 0.7.0.1 ...

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describeTo

Using AI Code Generation

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1import org.hamcrest.Description2import org.hamcrest.Matcher3import org.hamcrest.TypeSafeMatcher4class CustomMatcher<T>(private val expected: T) : TypeSafeMatcher<T>() {5 override fun describeTo(description: Description) {6 description.appendText("value should be $expected")7 }8 override fun matchesSafely(actual: T) = actual == expected9}10fun <T> isEqualTo(expected: T): Matcher<T> = CustomMatcher(expected)11import org.junit.Assert.assertThat12import org.junit.Test13class CustomMatcherTest {14 fun `should match`() {15 assertThat(1, isEqualTo(1))16 }17}18import org.hamcrest.Description19import org.hamcrest.Matcher20import org.hamcrest.TypeSafeMatcher21class CustomMatcher<T>(private val expected: T) : TypeSafeMatcher<T>() {22 override fun describeTo(description: Description) {23 description.appendText("value should be $expected")24 }25 override fun matchesSafely(actual: T) = actual == expected26 override fun describeMismatchSafely(actual: T, mismatchDescription: Description) {27 mismatchDescription.appendText("value should be $actual")28 }29}30fun <T> isEqualTo(expected: T): Matcher<T> = CustomMatcher(expected)31import org.junit.Assert.assertThat32import org.junit.Test33class CustomMatcherTest {34 fun `should match`() {35 assertThat(1, isEqualTo(1))36 }37}38import org.hamcrest.Description39import org.hamcrest.Matcher40import org.hamcrest.SelfDescribing41import org.hamcrest.TypeSafeMatcher42class CustomMatcher<T>(private val expected: T) : TypeSafeMatcher<T>() {43 override fun describeTo(description: Description) {44 description.appendText("value should be $expected")45 }46 override fun matchesSafely(actual: T) = actual == expected47 override fun describeMismatch(item: Any, mismatchDescription: Description) {48 mismatchDescription.appendText("value should be $item")

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describeTo

Using AI Code Generation

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1import org.hamcrest.Description2import org.hamcrest.Matcher3import org.hamcrest.TypeSafeDiagnosingMatcher4import org.junit.Assert.assertThat5import org.junit.Test6class Person(val name: String, val age: Int)7class PersonMatcher(private val matcher: Matcher<Person>) : TypeSafeDiagnosingMatcher<Person>() {8 override fun matchesSafely(item: Person, mismatchDescription: Description): Boolean {9 return matcher.matches(item)10 }11 override fun describeTo(description: Description) {12 matcher.describeTo(description)13 }14}15fun hasName(name: String) = object : TypeSafeDiagnosingMatcher<Person>() {16 override fun matchesSafely(item: Person, mismatchDescription: Description): Boolean {17 if (item.name == name) {18 } else {19 mismatchDescription.appendText("was ${item.name}")20 }21 }22 override fun describeTo(description: Description) {23 description.appendText("has name $name")24 }25}26fun hasAge(age: Int) = object : TypeSafeDiagnosingMatcher<Person>() {27 override fun matchesSafely(item: Person, mismatchDescription: Description): Boolean {28 if (item.age == age) {29 } else {30 mismatchDescription.appendText("was ${item.age}")31 }32 }33 override fun describeTo(description: Description) {34 description.appendText("has age $age")35 }36}37fun hasNameAndAge(name: String, age: Int) = PersonMatcher(hasName(name).and(hasAge(age)))38class PersonMatcherTest {39 fun `test hasName`() {40 val person = Person("John", 20)41 assertThat(person, hasName("John"))42 }43 fun `test hasAge`() {44 val person = Person("John", 20)45 assertThat(person, hasAge(20))46 }47 fun `test hasNameAndAge`() {48 val person = Person("John", 20)49 assertThat(person, hasNameAndAge("John", 20))50 }51}

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describeTo

Using AI Code Generation

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1import org.hamcrest.Description2import org.hamcrest.Matcher3import org.hamcrest.TypeSafeMatcher4class IsEmptyString: TypeSafeMatcher<String>() {5 override fun matchesSafely(item: String?): Boolean {6 }7 override fun describeTo(description: Description?) {8 description?.appendText("an empty string")9 }10}11fun isEmptyString(): Matcher<String> {12 return IsEmptyString()13}14import org.hamcrest.Description15import org.hamcrest.Matcher16import org.hamcrest.TypeSafeMatcher17class IsEmptyString: TypeSafeMatcher<String>() {18 override fun matchesSafely(item: String?): Boolean {19 }20 override fun describeTo(description: Description?) {21 description?.appendText("an empty string")22 }23}24fun isEmptyString(): Matcher<String> {25 return IsEmptyString()26}27import org.hamcrest.Description28import org.hamcrest.Matcher29import org.hamcrest.TypeSafeMatcher30class IsEmptyString: TypeSafeMatcher<String>() {31 override fun matchesSafely(item: String?): Boolean {32 }33 override fun describeTo(description: Description?) {34 description?.appendText("an empty string")35 }36 override fun describeMismatchSafely(item: String?, mismatchDescription: Description?) {37 mismatchDescription?.appendText("was \"${item}\"")38 }39}40fun isEmptyString(): Matcher<String> {41 return IsEmptyString()42}43import org.hamcrest.Description44import org.hamcrest.Matcher45import org.hamcrest.TypeSafeMatcher46class IsEmptyString: TypeSafeMatcher<String>() {47 override fun matchesSafely(item: String?): Boolean {48 }49 override fun describeTo(description: Description?) {50 description?.appendText("an empty string")51 }52 override fun describeMismatchSafely(item: String?, mismatchDescription: Description?) {53 mismatchDescription?.appendText("was \"${item}\"")54 }55}56fun isEmptyString(): Matcher<String> {57 return IsEmptyString()58}59import org.hamcrest.Description60import org.hamcrest.Matcher61import org

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describeTo

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1def "test description of matcher"(){2 matcher.describeTo(description)3 description.toString() == expectedDescription4 matcher << [greaterThan(1), lessThan(5), between(1,5)]5}6def "test description of mismatch"(){7 matcher.describeMismatch(item, description)8 description.toString() == expectedDescription9 matcher << [greaterThan(1), lessThan(5), between(1,5)]10}11def "test description of mismatch safely"(){12 matcher.describeMismatchSafely(item, description)13 description.toString() == expectedDescription14 matcher << [greaterThan(1), lessThan(5), between(1,5)]

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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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