diff --git a/test/com/google/javascript/jscomp/TypeICompilerTestCase.java b/test/com/google/javascript/jscomp/TypeICompilerTestCase.java
index 3d51c38cc8f..a8b020b30be 100644
--- a/test/com/google/javascript/jscomp/TypeICompilerTestCase.java
+++ b/test/com/google/javascript/jscomp/TypeICompilerTestCase.java
@@ -92,10 +92,14 @@ protected void testInternal(
   protected void testExternChanges(String extern, String input, String expectedExtern,
       DiagnosticType... warnings) {
     if (this.mode.runsOTI()) {
-      testExternChangesOTI(extern, input, expectedExtern, warnings);
+      enableTypeCheck();
+      super.testExternChanges(extern, input, expectedExtern, warnings);
+      disableTypeCheck();
     }
     if (this.mode.runsNTI()) {
-      testExternChangesNTI(extern, input, expectedExtern, warnings);
+      enableNewTypeInference();
+      super.testExternChanges(extern, input, expectedExtern, warnings);
+      disableNewTypeInference();
     }
     if (this.mode.runsNeither()) {
       super.testExternChanges(extern, input, expectedExtern, warnings);
@@ -148,26 +152,6 @@ private void testNTI(
     this.mode = saved;
   }
 
-  private void testExternChangesOTI(String extern, String input, String expectedExtern,
-      DiagnosticType... warnings) {
-    TypeInferenceMode saved = this.mode;
-    this.mode = TypeInferenceMode.OTI_ONLY;
-    enableTypeCheck();
-    super.testExternChanges(extern, input, expectedExtern, warnings);
-    disableTypeCheck();
-    this.mode = saved;
-  }
-
-  private void testExternChangesNTI(String extern, String input, String expectedExtern,
-      DiagnosticType... warnings) {
-    TypeInferenceMode saved = this.mode;
-    this.mode = TypeInferenceMode.NTI_ONLY;
-    enableNewTypeInference();
-    super.testExternChanges(extern, input, expectedExtern, warnings);
-    disableNewTypeInference();
-    this.mode = saved;
-  }
-
   void testWarningOtiNti(
       String js, DiagnosticType otiWarning, DiagnosticType ntiWarning) {
     TypeInferenceMode saved = this.mode;