Add DamerauLevenshteinEditDistancePolicyTest

Change-Id: Ia36bc6ddd0ec553fee151153061428c7c66d32d2

native/jni/NativeFileList.mk

@@ -132,6 +132,7 @@ LATIN_IME_CORE_TEST_FILES := \
     suggest/policyimpl/dictionary/utils/byte_array_utils_test.cpp \
     suggest/policyimpl/dictionary/utils/sparse_table_test.cpp \
     suggest/policyimpl/dictionary/utils/trie_map_test.cpp \
+    suggest/policyimpl/utils/damerau_levenshtein_edit_distance_policy_test.cpp \
     utils/autocorrection_threshold_utils_test.cpp \
     utils/int_array_view_test.cpp \
     utils/time_keeper_test.cpp

native/jni/tests/suggest/policyimpl/utils/damerau_levenshtein_edit_distance_policy_test.cpp

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/utils/damerau_levenshtein_edit_distance_policy.h"
+
+#include <gtest/gtest.h>
+
+#include <vector>
+
+#include "suggest/policyimpl/utils/edit_distance.h"
+#include "utils/int_array_view.h"
+
+namespace latinime {
+namespace {
+
+TEST(DamerauLevenshteinEditDistancePolicyTest, TestConstructPolicy) {
+    const std::vector<int> codePoints0 = { 0x20, 0x40, 0x60 };
+    const std::vector<int> codePoints1 = { 0x10, 0x20, 0x30, 0x40, 0x50, 0x60 };
+    DamerauLevenshteinEditDistancePolicy policy(codePoints0.data(), codePoints0.size(),
+            codePoints1.data(), codePoints1.size());
+
+    EXPECT_EQ(static_cast<int>(codePoints0.size()), policy.getString0Length());
+    EXPECT_EQ(static_cast<int>(codePoints1.size()), policy.getString1Length());
+}
+
+float getEditDistance(const std::vector<int> &codePoints0, const std::vector<int> &codePoints1) {
+    DamerauLevenshteinEditDistancePolicy policy(codePoints0.data(), codePoints0.size(),
+            codePoints1.data(), codePoints1.size());
+    return EditDistance::getEditDistance(&policy);
+}
+
+TEST(DamerauLevenshteinEditDistancePolicyTest, TestEditDistance) {
+    EXPECT_FLOAT_EQ(0.0f, getEditDistance({}, {}));
+    EXPECT_FLOAT_EQ(0.0f, getEditDistance({ 1 }, { 1 }));
+    EXPECT_FLOAT_EQ(0.0f, getEditDistance({ 1, 2, 3 }, { 1, 2, 3 }));
+
+    EXPECT_FLOAT_EQ(1.0f, getEditDistance({ 1 }, { }));
+    EXPECT_FLOAT_EQ(1.0f, getEditDistance({}, { 100 }));
+    EXPECT_FLOAT_EQ(5.0f, getEditDistance({}, { 1, 2, 3, 4, 5 }));
+
+    EXPECT_FLOAT_EQ(1.0f, getEditDistance({ 0 }, { 100 }));
+    EXPECT_FLOAT_EQ(5.0f, getEditDistance({ 1, 2, 3, 4, 5 }, { 11, 12, 13, 14, 15 }));
+
+    EXPECT_FLOAT_EQ(1.0f, getEditDistance({ 1 }, { 1, 2 }));
+    EXPECT_FLOAT_EQ(2.0f, getEditDistance({ 1, 2 }, { 0, 1, 2, 3 }));
+    EXPECT_FLOAT_EQ(2.0f, getEditDistance({ 0, 1, 2, 3 }, { 1, 2 }));
+
+    EXPECT_FLOAT_EQ(1.0f, getEditDistance({ 1, 2 }, { 2, 1 }));
+    EXPECT_FLOAT_EQ(2.0f, getEditDistance({ 1, 2, 3, 4 }, { 2, 1, 4, 3 }));
+}
+}  // namespace
+}  // namespace latinime