start junit 5 test with array/inner class parameters (IDEA-172103)

plugins/junit/src/com/intellij/execution/junit/JUnitConfiguration.java

@@ -42,8 +42,7 @@ import com.intellij.openapi.util.WriteExternalException;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.*;
-import com.intellij.psi.util.PsiFormatUtil;
-import com.intellij.psi.util.PsiFormatUtilBase;
+import com.intellij.psi.util.ClassUtil;
 import com.intellij.refactoring.listeners.RefactoringElementListener;
 import com.intellij.rt.execution.junit.RepeatCount;
 import org.jdom.Element;
@@ -625,11 +624,37 @@ public class JUnitConfiguration extends JavaTestConfigurationBase {
     }
 
     public static String getMethodPresentation(PsiMethod method) {
-      return method.getParameterList().getParametersCount() > 0 && MetaAnnotationUtil.isMetaAnnotated(method, JUnitUtil.TEST5_ANNOTATIONS)
-             ? PsiFormatUtil.formatMethod(method, PsiSubstitutor.EMPTY,
-                                          PsiFormatUtilBase.SHOW_NAME | PsiFormatUtilBase.SHOW_PARAMETERS,
-                                          PsiFormatUtilBase.SHOW_TYPE | PsiFormatUtilBase.SHOW_FQ_CLASS_NAMES)
-             : method.getName();
+      if (method.getParameterList().getParametersCount() > 0 && MetaAnnotationUtil.isMetaAnnotated(method, JUnitUtil.TEST5_ANNOTATIONS)) {
+        return method.getName() + "(" + StringUtil.join(method.getParameterList().getParameters(), 
+                                                        param -> param.getType().accept(createSignatureVisitor()),
+                                                        ",") + ")";
+      }
+      else {
+        return method.getName();
+      }
+    }
+
+    private static PsiTypeVisitor<String> createSignatureVisitor() {
+      return new PsiTypeVisitor<String>() {
+        @Override
+        public String visitPrimitiveType(PsiPrimitiveType primitiveType) {
+          return primitiveType.getCanonicalText();
+        }
+
+        @Override
+        public String visitClassType(PsiClassType classType) {
+          PsiClass aClass = classType.resolve();
+          if (aClass == null) {
+            return "";
+          }
+          return "L" + ClassUtil.getJVMClassName(aClass) + ";";
+        }
+
+        @Override
+        public String visitArrayType(PsiArrayType arrayType) {
+          return "[" + arrayType.getComponentType().accept(this);
+        }
+      };
     }
 
     public String getGeneratedName(final JavaRunConfigurationModule configurationModule) {

plugins/junit5_rt_tests/test/com/intellij/junit5/JUnit5NamingTest.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2000-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.junit5;
+
+import com.intellij.execution.junit.JUnitConfiguration;
+import com.intellij.psi.PsiJavaFile;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+public class JUnit5NamingTest extends JUnit5CodeInsightTest {
+  @Test
+  void arrayParameters() {
+    doTest(() -> {
+      PsiJavaFile file = (PsiJavaFile)myFixture.configureByText("MyTest.java", "import org.junit.jupiter.api.*;" +
+                                                                               "class MyTest {" +
+                                                                               "  @Test void foo(int[] i); \n" +
+                                                                               "  @Test void foo(String[] i); \n" +
+                                                                               "  @Test void foo(Foo[] i); \n" +
+                                                                               "  static class Foo {}" +
+                                                                               "}");
+      String[] methodPresentations =
+        Arrays.stream(file.getClasses()[0].getMethods())
+          .map(method -> JUnitConfiguration.Data.getMethodPresentation(method))
+          .toArray(String[]::new);
+      Assertions.assertArrayEquals(new String[] {"foo([int)", "foo([Ljava.lang.String;)", "foo([LMyTest$Foo;)"}, 
+                                   methodPresentations, 
+                                   Arrays.toString(methodPresentations));
+    });
+  }
+}