Bring back the unit tests for the Cxx implementation

Reviewed By: jeanlauliac

Differential Revision: D14026623

fbshipit-source-id: 76a4089bb09b7e5152e992a91eae0427877767c0

Author: fromcelticpark

ReactCommon/cxxreact/JSDeltaBundleClient.cpp

@@ -30,7 +30,7 @@ void JSDeltaBundleClient::patchModules(const folly::dynamic *modules) {
   for (const folly::dynamic pair : *modules) {
     auto id = pair[0].getInt();
     auto module = pair[1];
-    modules_.emplace(id, module.getString());
+    modules_[id] = std::move(module.getString());
   }
 }
 

ReactCommon/cxxreact/tests/BUCK

@@ -8,6 +8,7 @@ load(
 
 TEST_SRCS = [
     "RecoverableErrorTest.cpp",
+    "JSDeltaBundleClientTest.cpp",
     "jsarg_helpers.cpp",
     "jsbigstring.cpp",
     "methodcall.cpp",

ReactCommon/cxxreact/tests/JSDeltaBundleClientTest.cpp

@@ -0,0 +1,131 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
+#include <gtest/gtest.h>
+
+#include <exception>
+#include <iostream>
+#include <stdexcept>
+
+#include <cxxreact/JSDeltaBundleClient.h>
+#include <folly/dynamic.h>
+#include <folly/json.h>
+
+using namespace facebook::react;
+
+TEST(JSDeltaBundleClient, PatchStartupCode) {
+  JSDeltaBundleClient client;
+
+  folly::dynamic delta1 = folly::parseJson(R"({
+    "base": true,
+    "revisionId": "rev0",
+    "pre": "pre",
+    "post": "post",
+    "modules": [
+      [0, "0"],
+      [1, "1"]
+    ]
+  })");
+
+  client.patch(delta1);
+
+  EXPECT_STREQ(client.getStartupCode()->c_str(), "pre\npost\n");
+
+  folly::dynamic delta2 = folly::parseJson(R"({
+      "base": true,
+      "revisionId": "rev1",
+      "pre": "pre2",
+      "post": "post2",
+      "modules": []
+    })");
+
+  client.patch(delta2);
+
+  EXPECT_STREQ(client.getStartupCode()->c_str(), "pre2\npost2\n");
+}
+
+TEST(JSDeltaBundleClient, PatchModule) {
+  JSDeltaBundleClient client;
+
+  folly::dynamic delta1 = folly::parseJson(R"({
+    "base": true,
+    "revisionId": "rev0",
+    "pre": "pre",
+    "post": "post",
+    "modules": [
+      [0, "0"],
+      [1, "1"]
+    ]
+  })");
+
+  client.patch(delta1);
+
+  EXPECT_EQ(client.getModule(0).code, "0");
+  EXPECT_EQ(client.getModule(1).code, "1");
+
+  ASSERT_THROW(client.getModule(2), JSModulesUnbundle::ModuleNotFound);
+
+  folly::dynamic delta2 = folly::parseJson(R"({
+    "base": false,
+    "revisionId": "rev1",
+    "added": [
+      [2, "2"]
+    ],
+    "modified": [
+      [0, "0.1"]
+    ],
+    "deleted": [1]
+  })");
+
+  client.patch(delta2);
+
+  EXPECT_EQ(client.getModule(0).code, "0.1");
+  EXPECT_EQ(client.getModule(2).code, "2");
+  ASSERT_THROW(client.getModule(1), JSModulesUnbundle::ModuleNotFound);
+
+  folly::dynamic delta3 = folly::parseJson(R"({
+    "base": true,
+    "revisionId": "rev2",
+    "pre": "pre",
+    "post": "post",
+    "modules": [
+      [3, "3"],
+      [4, "4"]
+    ]
+  })");
+
+  client.patch(delta3);
+
+  ASSERT_THROW(client.getModule(0), JSModulesUnbundle::ModuleNotFound);
+  ASSERT_THROW(client.getModule(1), JSModulesUnbundle::ModuleNotFound);
+  ASSERT_THROW(client.getModule(2), JSModulesUnbundle::ModuleNotFound);
+
+  EXPECT_EQ(client.getModule(3).code, "3");
+  EXPECT_EQ(client.getModule(4).code, "4");
+}
+
+TEST(JSDeltaBundleClient, Clear) {
+  JSDeltaBundleClient client;
+
+  folly::dynamic delta1 = folly::parseJson(R"({
+    "base": true,
+    "revisionId": "rev0",
+    "pre": "pre",
+    "post": "post",
+    "modules": [
+      [0, "0"],
+      [1, "1"]
+    ]
+  })");
+
+  client.patch(delta1);
+
+  client.clear();
+
+  ASSERT_THROW(client.getModule(0), JSModulesUnbundle::ModuleNotFound);
+  ASSERT_THROW(client.getModule(1), JSModulesUnbundle::ModuleNotFound);
+
+  EXPECT_STREQ(client.getStartupCode()->c_str(), "");
+}