diff --git a/packages/language-service/test/completions_spec.ts b/packages/language-service/test/completions_spec.ts
index b97f374099..2a374879b8 100644
--- a/packages/language-service/test/completions_spec.ts
+++ b/packages/language-service/test/completions_spec.ts
@@ -41,12 +41,6 @@ describe('completions', () => {
   it('should be able to find common angular attributes',
      () => { expectContains('/app/test.ng', 'div-attributes', '(click)', '[ngClass]'); });
 
-  it('should be able to get completions in some random garbage', () => {
-    const fileName = '/app/test.ng';
-    mockHost.override(fileName, ' > {{tle<\n  {{retl  ><bel/beled}}di>\n   la</b  </d    &a  ');
-    expect(() => ngService.getCompletionsAt(fileName, 31)).not.toThrow();
-  });
-
   it('should be able to infer the type of a ngForOf', () => {
     const fileName = mockHost.addCode(`
       interface Person {
@@ -75,58 +69,6 @@ describe('completions', () => {
     expectContains(fileName, 'name', 'name', 'street');
   });
 
-  it('should be able to complete every character in the file', () => {
-    const fileName = '/app/test.ng';
-
-    expect(() => {
-      let chance = 0.05;
-      function tryCompletionsAt(position: number) {
-        try {
-          if (Math.random() < chance) {
-            ngService.getCompletionsAt(fileName, position);
-          }
-        } catch (e) {
-          // Emit enough diagnostic information to reproduce the error.
-          console.error(
-              `Position: ${position}\nContent: "${mockHost.readFile(fileName)}"\nStack:\n${e.stack}`);
-          throw e;
-        }
-      }
-
-      const originalContent = mockHost.readFile(fileName) !;
-
-      // For each character in the file, add it to the file and request a completion after it.
-      for (let index = 0, len = originalContent.length; index < len; index++) {
-        const content = originalContent.substr(0, index);
-        mockHost.override(fileName, content);
-        tryCompletionsAt(index);
-      }
-
-      // For the complete file, try to get a completion at every character.
-      mockHost.override(fileName, originalContent);
-      for (let index = 0, len = originalContent.length; index < len; index++) {
-        tryCompletionsAt(index);
-      }
-
-      // Delete random characters in the file until we get an empty file.
-      let content = originalContent;
-      while (content.length > 0) {
-        const deleteIndex = Math.floor(Math.random() * content.length);
-        content = content.slice(0, deleteIndex - 1) + content.slice(deleteIndex + 1);
-        mockHost.override(fileName, content);
-
-        const requestIndex = Math.floor(Math.random() * content.length);
-        tryCompletionsAt(requestIndex);
-      }
-
-      // Build up the string from zero asking for a completion after every char
-      buildUp(originalContent, (text, position) => {
-        mockHost.override(fileName, text);
-        tryCompletionsAt(position);
-      });
-    }).not.toThrow();
-  });
-
   describe('with regression tests', () => {
     it('should not crash with an incomplete component', () => {
       expect(() => {
@@ -222,35 +164,3 @@ function expectEntries(
         `Expected result from ${locationMarker} to include at least one of the following, ${missing.join(', ')}, in the list of entries ${completion.entries.map(entry => entry.name).join(', ')}`);
   }
 }
-
-function buildUp(originalText: string, cb: (text: string, position: number) => void) {
-  let count = originalText.length;
-
-  let inString: boolean[] = (new Array(count)).fill(false);
-  let unused: number[] = (new Array(count)).fill(1).map((v, i) => i);
-
-  function getText() {
-    return new Array(count)
-        .fill(1)
-        .map((v, i) => i)
-        .filter(i => inString[i])
-        .map(i => originalText[i])
-        .join('');
-  }
-
-  function randomUnusedIndex() { return Math.floor(Math.random() * unused.length); }
-
-  while (unused.length > 0) {
-    let unusedIndex = randomUnusedIndex();
-    let index = unused[unusedIndex];
-    if (index == null) throw new Error('Internal test buildup error');
-    if (inString[index]) throw new Error('Internal test buildup error');
-    inString[index] = true;
-    unused.splice(unusedIndex, 1);
-    let text = getText();
-    let position = inString.filter((_, i) => i <= index)
-                       .map(v => v ? 1 : 0)
-                       .reduce((p: number, v) => p + v, 0);
-    cb(text, position);
-  }
-}