Implement Firestore DatabaseInfo and port both Database{Id,Info} C++ to the iOS code (#738)

* implement Firestore DatabaseInfo in C++

* temporary stash changes; blocking on the massive renaming of .m to .mm

* add database_info_test to project

* finish port DatabaseId and fix style, modular fixing DatabaseInfo

* port DatabaseInfo

* remove FSTDatabase{ID,Info} and their tests from project

* fix unit test

* use namespace alias

* use namespace alias, leftover

* address more changes

* refactoring to use raw pointer instead of value for property

* address changes

* remove self->

* fix style

* remove the name suffix Alloc

* fix a bug

3 files changed, 50 insertions, 1 deletions

diff --git a/Firestore/core/test/firebase/firestore/core/CMakeLists.txt b/Firestore/core/test/firebase/firestore/core/CMakeLists.txt
index 34993aa..5b4c55a 100644
--- a/Firestore/core/test/firebase/firestore/core/CMakeLists.txt
+++ b/Firestore/core/test/firebase/firestore/core/CMakeLists.txt
@@ -15,6 +15,7 @@
 cc_test(
   firebase_firestore_core_test
   SOURCES
+    database_info_test.cc
     target_id_generator_test.cc
   DEPENDS
     firebase_firestore_core
diff --git a/Firestore/core/test/firebase/firestore/core/database_info_test.cc b/Firestore/core/test/firebase/firestore/core/database_info_test.cc
new file mode 100644
index 0000000..d865105
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/core/database_info_test.cc
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2018 Google
+ *
+ * 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 "Firestore/core/src/firebase/firestore/core/database_info.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace core {
+
+using firebase::firestore::model::DatabaseId;
+
+TEST(DatabaseInfo, Getter) {
+  DatabaseInfo info(DatabaseId("project id", "database id"), "key",
+                    "http://host", true);
+  EXPECT_EQ(DatabaseId("project id", "database id"), info.database_id());
+  EXPECT_EQ("key", info.persistence_key());
+  EXPECT_EQ("http://host", info.host());
+  EXPECT_TRUE(info.ssl_enabled());
+}
+
+TEST(DatabaseInfo, DefaultDatabase) {
+  DatabaseInfo info(DatabaseId("project id", DatabaseId::kDefaultDatabaseId),
+                    "key", "http://host", false);
+  EXPECT_EQ("project id", info.database_id().project_id());
+  EXPECT_EQ("(default)", info.database_id().database_id());
+  EXPECT_EQ("key", info.persistence_key());
+  EXPECT_EQ("http://host", info.host());
+  EXPECT_FALSE(info.ssl_enabled());
+}
+
+}  //  namespace core
+}  //  namespace firestore
+}  //  namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/model/database_id_test.cc b/Firestore/core/test/firebase/firestore/model/database_id_test.cc
index e9c9439..16b0e6b 100644
--- a/Firestore/core/test/firebase/firestore/model/database_id_test.cc
+++ b/Firestore/core/test/firebase/firestore/model/database_id_test.cc
@@ -32,7 +32,7 @@ TEST(DatabaseId, Constructor) {
 TEST(DatabaseId, DefaultDb) {
   DatabaseId id("p", DatabaseId::kDefaultDatabaseId);
   EXPECT_EQ("p", id.project_id());
-  EXPECT_EQ(DatabaseId::kDefaultDatabaseId, id.database_id());
+  EXPECT_EQ("(default)", id.database_id());
   EXPECT_TRUE(id.IsDefaultDatabase());
 }