diff --git a/internal_packages/composer-spellcheck/spec/spellcheck-composer-extension-spec.es6 b/internal_packages/composer-spellcheck/spec/spellcheck-composer-extension-spec.es6
index eaad45216..b2ee28a82 100644
--- a/internal_packages/composer-spellcheck/spec/spellcheck-composer-extension-spec.es6
+++ b/internal_packages/composer-spellcheck/spec/spellcheck-composer-extension-spec.es6
@@ -15,6 +15,11 @@ describe('SpellcheckComposerExtension', function spellcheckComposerExtension() {
     const lookupPath = path.join(__dirname, 'fixtures', 'california-spelling-lookup.json');
     const spellings = JSON.parse(fs.readFileSync(lookupPath));
     spyOn(Spellchecker, 'isMisspelled').andCallFake(word => spellings[word])
+    spyOn(Spellchecker.handler, 'provideHintText').andReturn({
+      then(cb) {
+        cb()
+      },
+    })
   });
 
   describe("onContentChanged", () => {
@@ -28,6 +33,8 @@ describe('SpellcheckComposerExtension', function spellcheckComposerExtension() {
       };
 
       SpellcheckComposerExtension.onContentChanged({editor});
+      advanceClock(1000) // Wait for debounce
+      advanceClock(1) // Wait for defer
       expect(node.innerHTML).toEqual(afterHTML);
     });
 
@@ -51,6 +58,8 @@ describe('SpellcheckComposerExtension', function spellcheckComposerExtension() {
       };
 
       SpellcheckComposerExtension.onContentChanged({editor});
+      advanceClock(1000) // Wait for debounce
+      advanceClock(1) // Wait for defer
       expect(node.innerHTML).toEqual(`
       <br>
       This is a <spelling class="misspelled">testst</spelling>! I have a few <spelling class="misspelled">misspellled</spelling> words.
diff --git a/src/K2 b/src/K2
index 3390bc078..590a4499f 160000
--- a/src/K2
+++ b/src/K2
@@ -1 +1 @@
-Subproject commit 3390bc0783d7f17906a6884e4d757876a337506f
+Subproject commit 590a4499fea6bece4ef5da40ca8f1b4d74ba72f5