test only: check method references (IDEA-164989)

java/java-analysis-impl/src/com/intellij/codeInspection/testOnly/TestOnlyInspection.java

@@ -59,6 +59,14 @@ public class TestOnlyInspection extends BaseJavaBatchLocalInspectionTool {
         validate(e, e.resolveMethod(), h);
       }
 
+      @Override
+      public void visitMethodReferenceExpression(PsiMethodReferenceExpression expression) {
+        PsiElement resolve = expression.resolve();
+        if (resolve instanceof PsiMethod) {
+          validate(expression, (PsiMethod)resolve, h);
+        }
+      }
+
       @Override
       public void visitReferenceExpression(PsiReferenceExpression reference) {
         PsiElement resolve = reference.resolve();