Switches libtextclassifier to ICU4J (from ICU4C).

 - reviewed in cl/227847565 and exported automatically

Test: builds, tested on device
FIXES: 119788152

Change-Id: If7d77b7792b69fcd88480967e4a52f0e29dd18ac
diff --git a/actions/zlib-utils_test.cc b/actions/zlib-utils_test.cc
new file mode 100644
index 0000000..377f344
--- /dev/null
+++ b/actions/zlib-utils_test.cc
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 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 "actions/zlib-utils.h"
+
+#include <memory>
+
+#include "actions/actions_model_generated.h"
+#include "utils/zlib/zlib.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace libtextclassifier3 {
+
+namespace {
+
+TEST(ZlibUtilsTest, CompressModel) {
+  ActionsModelT model;
+  constexpr char kTestPattern1[] = "this is a test pattern";
+  constexpr char kTestPattern2[] = "this is a second test pattern";
+  model.rules.reset(new RulesModelT);
+  model.rules->rule.emplace_back(new RulesModel_::RuleT);
+  model.rules->rule.back()->pattern = kTestPattern1;
+  model.rules->rule.emplace_back(new RulesModel_::RuleT);
+  model.rules->rule.back()->pattern = kTestPattern2;
+
+  // Compress the model.
+  EXPECT_TRUE(CompressActionsModel(&model));
+
+  // Sanity check that uncompressed field is removed.
+  EXPECT_TRUE(model.rules->rule[0]->pattern.empty());
+  EXPECT_TRUE(model.rules->rule[1]->pattern.empty());
+  // Pack and load the model.
+  flatbuffers::FlatBufferBuilder builder;
+  FinishActionsModelBuffer(builder, ActionsModel::Pack(builder, &model));
+  const ActionsModel* compressed_model = GetActionsModel(
+      reinterpret_cast<const char*>(builder.GetBufferPointer()));
+  ASSERT_TRUE(compressed_model != nullptr);
+
+  // Decompress the fields again and check that they match the original.
+  std::unique_ptr<ZlibDecompressor> decompressor = ZlibDecompressor::Instance();
+  ASSERT_TRUE(decompressor != nullptr);
+  std::string uncompressed_pattern;
+  EXPECT_TRUE(decompressor->MaybeDecompress(
+      compressed_model->rules()->rule()->Get(0)->compressed_pattern(),
+      &uncompressed_pattern));
+  EXPECT_EQ(uncompressed_pattern, kTestPattern1);
+  EXPECT_TRUE(decompressor->MaybeDecompress(
+      compressed_model->rules()->rule()->Get(1)->compressed_pattern(),
+      &uncompressed_pattern));
+  EXPECT_EQ(uncompressed_pattern, kTestPattern2);
+  EXPECT_TRUE(DecompressActionsModel(&model));
+  EXPECT_EQ(model.rules->rule[0]->pattern, kTestPattern1);
+  EXPECT_EQ(model.rules->rule[1]->pattern, kTestPattern2);
+}
+
+}  // namespace
+
+}  // namespace libtextclassifier3