BAEL-2911 - JUnit Custom Display Name Generator API

2019-06-15 09:58:54 +03:00
parent 92989e4556
commit a11e0088ba
3 changed files with 120 additions and 0 deletions
@@ -0,0 +1,87 @@
+package com.baeldung.displayname;
+
+import org.junit.jupiter.api.DisplayNameGeneration;
+import org.junit.jupiter.api.DisplayNameGenerator;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.lang.reflect.Method;
+
+@DisplayNameGeneration(DisplayNameGeneratorUnitTest.ReplaceCamelCase.class)
+class DisplayNameGeneratorUnitTest {
+
+    @Test
+    void camelCaseName() {
+    }
+
+    @Nested
+    @DisplayNameGeneration(DisplayNameGeneratorUnitTest.IndicativeSentences.class)
+    class ANumberIsFizz {
+        @Test
+        void ifItIsDivisibleByThree() {
+        }
+
+        @ParameterizedTest(name = "Number {0} is fizz.")
+        @ValueSource(ints = { 3, 12, 18 })
+        void ifItIsOneOfTheFollowingNumbers(int number) {
+        }
+    }
+
+    @Nested
+    @DisplayNameGeneration(DisplayNameGeneratorUnitTest.IndicativeSentences.class)
+    class ANumberIsBuzz {
+        @Test
+        void ifItIsDivisibleByFive() {
+        }
+
+        @ParameterizedTest(name = "Number {0} is buzz.")
+        @ValueSource(ints = { 5, 10, 20 })
+        void ifItIsOneOfTheFollowingNumbers(int number) {
+        }
+    }
+
+    static class IndicativeSentences extends ReplaceCamelCase {
+        @Override
+        public String generateDisplayNameForNestedClass(Class<?> nestedClass) {
+            return super.generateDisplayNameForNestedClass(nestedClass) + "...";
+        }
+
+        @Override
+        public String generateDisplayNameForMethod(Class<?> testClass, Method testMethod) {
+            return replaceCamelCase(testClass.getSimpleName() + " " + testMethod.getName()) + ".";
+        }
+    }
+
+    static class ReplaceCamelCase extends DisplayNameGenerator.Standard {
+        @Override
+        public String generateDisplayNameForClass(Class<?> testClass) {
+            return replaceCamelCase(super.generateDisplayNameForClass(testClass));
+        }
+
+        @Override
+        public String generateDisplayNameForNestedClass(Class<?> nestedClass) {
+            return replaceCamelCase(super.generateDisplayNameForNestedClass(nestedClass));
+        }
+
+        @Override
+        public String generateDisplayNameForMethod(Class<?> testClass, Method testMethod) {
+            return this.replaceCamelCase(testMethod.getName()) + DisplayNameGenerator.parameterTypesAsString(testMethod);
+        }
+
+        String replaceCamelCase(String camelCase) {
+            StringBuilder result = new StringBuilder();
+            result.append(camelCase.charAt(0));
+            for (int i=1; i<camelCase.length(); i++) {
+                if (Character.isUpperCase(camelCase.charAt(i))) {
+                    result.append(' ');
+                    result.append(Character.toLowerCase(camelCase.charAt(i)));
+                } else {
+                    result.append(camelCase.charAt(i));
+                }
+            }
+            return result.toString();
+        }
+    }
+}