From c7fcbb9f6b69b6152bcc00a32aa7f7bbeda4fb30 Mon Sep 17 00:00:00 2001
From: Cyrus Najmabadi <cyrusn@microsoft.com>
Date: Tue, 9 Dec 2014 17:29:52 -0800
Subject: [PATCH] Add incremental test.

---
 tests/cases/unittests/incrementalParser.ts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tests/cases/unittests/incrementalParser.ts b/tests/cases/unittests/incrementalParser.ts
index 2ff47f52825..5ed3103e346 100644
--- a/tests/cases/unittests/incrementalParser.ts
+++ b/tests/cases/unittests/incrementalParser.ts
@@ -147,6 +147,18 @@ module ts {
         }
     }
 
+    function deleteCode(source: string, index: number, toDelete: string) {
+        var repeat = toDelete.length;
+
+        for (var i = 0; i < repeat; i++) {
+            var oldText = ScriptSnapshot.fromString(source);
+            var newTextAndChange = withDelete(oldText, index, 1);
+            compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, -1);
+
+            source = newTextAndChange.text.getText(0, newTextAndChange.text.getLength());
+        }
+    }
+
     describe('Incremental',() => {
         it('Inserting into method',() => {
             var source = "class C {\r\n" +
@@ -418,5 +430,14 @@ module ts {
 
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, -1);
         });
+
+        // Simulated typing tests.
+
+        it('Type extends clause 1',() => {
+            var source = "interface IFoo<T> { }\r\ninterface Array<T> extends IFoo<T> { }";
+
+            var index = source.indexOf('extends');
+            deleteCode(source, index, "extends IFoo<T>");
+        });
     });
 }
\ No newline at end of file