diff --git a/lib/Index/IndexSymbol.cpp b/lib/Index/IndexSymbol.cpp
index a4a0207..fb98c1d 100644
--- a/lib/Index/IndexSymbol.cpp
+++ b/lib/Index/IndexSymbol.cpp
@@ -185,10 +185,18 @@
       Info.Lang = SymbolLanguage::ObjC;
       break;
     case Decl::ObjCCategory:
-    case Decl::ObjCCategoryImpl:
+    case Decl::ObjCCategoryImpl: {
       Info.Kind = SymbolKind::Extension;
       Info.Lang = SymbolLanguage::ObjC;
+      const ObjCInterfaceDecl *ClsD = nullptr;
+      if (auto *CatD = dyn_cast<ObjCCategoryDecl>(D))
+        ClsD = CatD->getClassInterface();
+      else
+        ClsD = cast<ObjCCategoryImplDecl>(D)->getClassInterface();
+      if (isUnitTestCase(ClsD))
+        Info.Properties |= (unsigned)SymbolProperty::UnitTest;
       break;
+    }
     case Decl::ObjCMethod:
       if (cast<ObjCMethodDecl>(D)->isInstanceMethod()) {
         const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
diff --git a/test/Index/Core/index-subkinds.m b/test/Index/Core/index-subkinds.m
index 71959d4..5eea046 100644
--- a/test/Index/Core/index-subkinds.m
+++ b/test/Index/Core/index-subkinds.m
@@ -28,11 +28,11 @@
 
 // CHECK: [[@LINE+3]]:12 | class(test)/ObjC | MyTestCase | c:objc(cs)MyTestCase | _OBJC_CLASS_$_MyTestCase | Ref,RelExt,RelCont | rel: 1
 // CHECK-NEXT: RelExt,RelCont | cat | c:objc(cy)MyTestCase@cat
-// CHECK: [[@LINE+1]]:23 | extension/ObjC | cat | c:objc(cy)MyTestCase@cat | <no-cgname> | Decl | rel: 0
+// CHECK: [[@LINE+1]]:23 | extension(test)/ObjC | cat | c:objc(cy)MyTestCase@cat | <no-cgname> | Decl | rel: 0
 @interface MyTestCase(cat)
 @end
 // CHECK: [[@LINE+2]]:17 | class(test)/ObjC | MyTestCase | c:objc(cs)MyTestCase | _OBJC_CLASS_$_MyTestCase | Ref,RelCont | rel: 1
-// CHECK: [[@LINE+1]]:28 | extension/ObjC | cat | c:objc(cy)MyTestCase@cat | <no-cgname> | Def | rel: 0
+// CHECK: [[@LINE+1]]:28 | extension(test)/ObjC | cat | c:objc(cy)MyTestCase@cat | <no-cgname> | Def | rel: 0
 @implementation MyTestCase(cat)
 // CHECK: [[@LINE+1]]:9 | instance-method(test)/ObjC | testInCat | c:objc(cs)MyTestCase(im)testInCat | -[MyTestCase(cat) testInCat] | Def,Dyn,RelChild | rel: 1
 - (void)testInCat {}