Spellcheck : Fix caching in cases where text is deleted.

components/spellcheck/renderer/spellcheck_provider_unittest.cc

Index: components/spellcheck/renderer/spellcheck_provider_unittest.cc
diff --git a/components/spellcheck/renderer/spellcheck_provider_unittest.cc b/components/spellcheck/renderer/spellcheck_provider_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a3b00a13460895d8752192ade3d490107299f01c
--- /dev/null
+++ b/components/spellcheck/renderer/spellcheck_provider_unittest.cc
@@ -0,0 +1,51 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/strings/utf_string_conversions.h"
+#include "components/spellcheck/renderer/spellcheck_provider_test.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+#include "third_party/WebKit/public/web/WebTextCheckingCompletion.h"
+#include "third_party/WebKit/public/web/WebTextCheckingResult.h"
+
+namespace {
+
+class SpellCheckProviderCacheTest : public SpellCheckProviderTest {};
+
+TEST_F(SpellCheckProviderCacheTest, SubstringWithoutMisspellings) {
+  FakeTextCheckingCompletion completion;
+
+  blink::WebVector<blink::WebTextCheckingResult> last_results;
+  provider_.SetLastResults(base::ASCIIToUTF16("This is a test"), last_results);
+  EXPECT_TRUE(provider_.SatisfyRequestFromCache(base::ASCIIToUTF16("This is a"),
+                                                &completion));
+  EXPECT_EQ(completion.completion_count_, 1U);
+}
+
+TEST_F(SpellCheckProviderCacheTest, SubstringWithMisspellings) {
+  FakeTextCheckingCompletion completion;
+
+  blink::WebVector<blink::WebTextCheckingResult> last_results;
+  std::vector<blink::WebTextCheckingResult> results;
+  results.push_back(blink::WebTextCheckingResult(
+      blink::WebTextDecorationTypeSpelling, 5, 3, blink::WebString("isq")));
+  last_results.assign(results);
+  provider_.SetLastResults(base::ASCIIToUTF16("This isq a test"), last_results);
+  EXPECT_TRUE(provider_.SatisfyRequestFromCache(
+      base::ASCIIToUTF16("This isq a"), &completion));
+  EXPECT_EQ(completion.completion_count_, 1U);
+}
+
+TEST_F(SpellCheckProviderCacheTest, ShorterTextNotSubstring) {
+  FakeTextCheckingCompletion completion;
+
+  blink::WebVector<blink::WebTextCheckingResult> last_results;
+  provider_.SetLastResults(base::ASCIIToUTF16("This is a test"), last_results);
+  EXPECT_FALSE(provider_.SatisfyRequestFromCache(
+      base::ASCIIToUTF16("That is a"), &completion));
+  EXPECT_EQ(completion.completion_count_, 0U);
+}
+
+}  // namespace