How to use methodResultFor method of org.assertj.core.util.introspection.MethodSupport class

Best Assertj code snippet using org.assertj.core.util.introspection.MethodSupport.methodResultFor

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...19import org.junit.Before;20import org.junit.Rule;21import org.junit.Test;22/​**23 * Tests for <code>{@link MethodSupport#methodResultFor(Object, String)}</​code>.24 *25 * @author Michał Piotrkowski26 */​27public class MethodSupport_methodResultFor_Test {28 @Rule29 public ExpectedException thrown = none();30 private Person bruceWayne;31 private Person joker;32 private SuperHero batman;33 @Before34 public void setUp() {35 bruceWayne = new Person("Bruce Wayne");36 joker = new Person("Joker");37 batman = new SuperHero("Batman", bruceWayne, joker);38 }39 @Test40 public void should_invoke_methods_without_arguments() {41 Object result = MethodSupport.methodResultFor(batman, "archenemy");42 assertThat(result).isEqualTo(joker);43 }44 @Test45 public void should_invoke_methods_from_superclass() {46 Object result = MethodSupport.methodResultFor(batman, "getName");47 assertThat(result).isEqualTo("Batman");48 }49 @Test50 public void should_fail_meaningfully_if_object_instance_not_provided() {51 thrown.expectNullPointerException("Object instance can not be null!");52 MethodSupport.methodResultFor(null, "methodName");53 }54 @Test55 public void should_fail_meaningfully_if_method_name_not_provided() {56 thrown.expectNullPointerException("Method name can not be empty!");57 MethodSupport.methodResultFor(batman, null);58 }59 @Test60 public void should_fail_meaningfully_if_method_name_is_empty() {61 thrown.expectIllegalArgumentException("Method name can not be empty!");62 MethodSupport.methodResultFor(batman, "");63 }64 @Test65 public void should_fail_meaningfully_if_method_not_found() {66 thrown.expectIllegalArgumentException("Can't find method 'commitCrime' in class SuperHero.class. Make sure public" +67 " method exists and accepts no arguments!");68 MethodSupport.methodResultFor(batman, "commitCrime");69 }70 @Test71 public void should_fail_meaningfully_if_method_does_not_return_value() {72 thrown.expectIllegalArgumentException("Method 'saveTheDay' in class SuperHero.class has to return a value!");73 MethodSupport.methodResultFor(batman, "saveTheDay");74 }75 @Test76 public void should_fail_meaningfully_if_method_is_not_public() {77 thrown.expectIllegalArgumentException("Can't find method 'trueIdentity' in class SuperHero.class. Make sure " +78 "public method exists and accepts no arguments!");79 MethodSupport.methodResultFor(batman, "trueIdentity");80 }81}...

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methodResultFor

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1import org.assertj.core.util.introspection.MethodSupport;2import org.junit.Test;3public class MethodSupportTest {4 public void testMethodResultFor() throws Exception {5 String methodName = "getAge";6 Person person = new Person();7 person.setAge(10);8 int result = MethodSupport.instance().methodResultFor(methodName, person, int.class);9 System.out.println("result = " + result);10 }11 private static class Person {12 private int age;13 public int getAge() {14 return age;15 }16 public void setAge(int age) {17 this.age = age;18 }19 }20}

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methodResultFor

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1import org.assertj.core.util.introspection.IntrospectionError2import org.assertj.core.util.introspection.MethodSupport3class Person {4 String getName() { return name }5}6def person = new Person()7def methodResult = MethodSupport.methodResultFor("getName", person)8def methodResultWithParams = MethodSupport.methodResultFor("getName", person, [1, 2, 3])9try {10 MethodSupport.methodResultFor("getAge", person)11} catch (IntrospectionError e) {12}13try {14 MethodSupport.methodResultFor("getName", new Person() {15 String getName() { throw new RuntimeException() }16 })17} catch (RuntimeException e) {18}19class Person2 {20 List<String> getNames() { return names }21}22def person2 = new Person2()23def methodResult2 = MethodSupport.methodResultFor("getNames", person2)24class Person3 {25 int getAge() { return age }26}27def person3 = new Person3()28def methodResult3 = MethodSupport.methodResultFor("getAge", person3)29class Person4 {30 int getAge() { return age }31}32def person4 = new Person4()33def methodResult4 = MethodSupport.methodResultFor("getAge", person4)

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methodResultFor

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1import org.assertj.core.util.introspection.MethodSupport;2class MethodSupportExample {3 private final MethodSupport methodSupport = new MethodSupport();4 public static void main(String[] args) {5 new MethodSupportExample().example();6 }7 void example() {8 String[] names = {"John", "Jane", "Adam", "Tom"};9 Object result = methodSupport.methodResultFor("length", names);10 System.out.println(result);11 }12}

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methodResultFor

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1import org.assertj.core.util.introspection.MethodSupport;2public class MethodSupportExample {3 public static void main(String[] args) {4 MethodSupportExample obj = new MethodSupportExample();5 Object result = MethodSupport.methodResultFor(obj, "sum", new Object[]{10, 20});6 System.out.println(result);7 }8 public int sum(int a, int b){9 return a+b;10 }11}

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methodResultFor

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1import org.assertj.core.util.introspection.MethodSupport;2public class MethodSupportTest {3 public static void main(String[] args) {4 MethodSupport ms = new MethodSupport();5 String[] s = new String[]{"a", "b", "c"};6 Object res = ms.methodResultFor("toString", s, new Class[]{});7 System.out.println(res);8 }9}

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methodResultFor

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1import org.assertj.core.util.introspection.MethodSupport;2class MethodSupportExample {3 public static void main(String[] args) {4 Person person = new Person("John", "Doe");5 String firstName = (String) MethodSupport.methodResultFor("getFirstName", person);6 System.out.println(firstName);7 }8 static class Person {9 private final String firstName;10 private final String lastName;11 Person(String firstName, String lastName) {12 this.firstName = firstName;13 this.lastName = lastName;14 }15 public String getFirstName() {16 return firstName;17 }18 public String getLastName() {19 return lastName;20 }21 }22}

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