diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index 3659d8844a9..26e21f07c15 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -1515,6 +1515,14 @@ module FourSlash {
             }
         }
 
+        public verifyDefinitionsCount(negative: boolean, expectedCount: number) {
+            var assertFn = negative ? assert.notEqual : assert.equal;
+
+            var definitions = this.languageService.getDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+
+            assertFn(definitions.length, expectedCount, this.messageAtLastKnownMarker("Definitions Count"));
+        }
+
         public verifyDefinitionsName(negative: boolean, expectedName: string, expectedContainerName: string) {
             this.taoInvalidReason = 'verifyDefinititionsInfo NYI';
 
diff --git a/tests/cases/fourslash/fourslash.ts b/tests/cases/fourslash/fourslash.ts
index f5a582868e5..fcf7ae7e3b1 100644
--- a/tests/cases/fourslash/fourslash.ts
+++ b/tests/cases/fourslash/fourslash.ts
@@ -217,6 +217,10 @@ module FourSlashInterface {
             FourSlash.currentTestState.verifyQuickInfoExists(this.negative);
         }
 
+        public definitionCountIs(expectedCount: number) {
+            FourSlash.currentTestState.verifyDefinitionsCount(this.negative, expectedCount);
+        }
+
         public definitionLocationExists() {
             FourSlash.currentTestState.verifyDefinitionLocationExists(this.negative);
         }