Add an initial native test on host environment

This CL adds an initial native test that runs on host
environment, from which we can extend the coverage of native
test.

BUG: 13754552
Change-Id: I0af9d1b5dd049c83b955f5b05add4b39f3cfcc6c

native/jni/Android.mk

@@ -87,6 +87,8 @@ LOCAL_NDK_STL_VARIANT := c++_static
 LOCAL_LDFLAGS += -ldl
 
 include $(BUILD_SHARED_LIBRARY)
-
 #################### Clean up the tmp vars
 include $(LOCAL_PATH)/CleanupNativeFileList.mk
+
+#################### Unit test on host environment
+include $(LOCAL_PATH)/HostUnitTests.mk

native/jni/CleanupNativeFileList.mk

@@ -13,5 +13,6 @@
 # limitations under the License.
 
 LATIN_IME_CORE_SRC_FILES :=
+LATIN_IME_CORE_TEST_FILES :=
 LATIN_IME_JNI_SRC_FILES :=
 LATIN_IME_SRC_DIR :=

native/jni/HostUnitTests.mk

@@ -0,0 +1,53 @@
+# 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.
+
+LOCAL_PATH := $(call my-dir)
+
+######################################
+include $(CLEAR_VARS)
+
+include $(LOCAL_PATH)/NativeFileList.mk
+
+#################### Host library for unit test
+# TODO: Remove -std=c++11 once it is set by default on host build.
+LATIN_IME_SRC_DIR := src
+LOCAL_CFLAGS += -std=c++11 -Wno-unused-parameter -Wno-unused-function
+LOCAL_CLANG := true
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
+LOCAL_IS_HOST_MODULE := true
+LOCAL_MODULE := liblatinime_host_static_for_unittests
+LOCAL_MODULE_TAGS := optional
+LOCAL_NDK_STL_VARIANT := c++_static
+LOCAL_SRC_FILES := $(addprefix $(LATIN_IME_SRC_DIR)/, $(LATIN_IME_CORE_SRC_FILES))
+include $(BUILD_HOST_STATIC_LIBRARY)
+
+#################### Host native tests
+include $(CLEAR_VARS)
+LATIN_IME_TEST_SRC_DIR := tests
+# TODO: Remove -std=c++11 once it is set by default on host build.
+LOCAL_CFLAGS += -std=c++11 -Wno-unused-parameter -Wno-unused-function
+LOCAL_CLANG := true
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
+LOCAL_IS_HOST_MODULE := true
+LOCAL_MODULE := liblatinime_host_unittests
+LOCAL_MODULE_TAGS := tests
+LOCAL_NDK_STL_VARIANT := c++_static
+LOCAL_SRC_FILES := $(addprefix $(LATIN_IME_TEST_SRC_DIR)/, $(LATIN_IME_CORE_TEST_FILES))
+LOCAL_STATIC_LIBRARIES += liblatinime_host_static_for_unittests libgtest_host libgtest_main_host
+include $(BUILD_HOST_NATIVE_TEST)
+
+#################### Clean up the tmp vars
+LATIN_IME_SRC_DIR :=
+LATIN_IME_TEST_SRC_DIR :=
+include $(LOCAL_PATH)/CleanupNativeFileList.mk

native/jni/NativeFileList.mk

@@ -99,3 +99,6 @@ LATIN_IME_CORE_SRC_FILES := \
         char_utils.cpp \
         log_utils.cpp \
         time_keeper.cpp)
+
+LATIN_IME_CORE_TEST_FILES := \
+    utils/autocorrection_threshold_utils_test.cpp

native/jni/tests/utils/autocorrection_threshold_utils_test.cpp

@@ -0,0 +1,39 @@
+/*
+ * 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 "utils/autocorrection_threshold_utils.h"
+
+#include <gtest/gtest.h>
+
+#include <vector>
+
+namespace latinime {
+namespace {
+
+int CalcEditDistance(const std::vector<int> &before,
+        const std::vector<int> &after) {
+    return AutocorrectionThresholdUtils::editDistance(
+            &before[0], before.size(), &after[0], after.size());
+}
+
+TEST(AutocorrectionThresholdUtilsTest, SameData) {
+    EXPECT_EQ(0, CalcEditDistance({1}, {1}));
+    EXPECT_EQ(0, CalcEditDistance({2, 2}, {2, 2}));
+    EXPECT_EQ(0, CalcEditDistance({3, 3, 3}, {3, 3, 3}));
+}
+
+}  // namespace
+}  // namespace latinime