iOS: added fabric/core primitives tests

Summary: basic tests for fabric core primitives

Reviewed By: shergin

Differential Revision: D7373952

fbshipit-source-id: e2d9b3c15716c16b1aab698883817e670dcb7a57

ReactCommon/fabric/core/BUCK

@@ -10,14 +10,12 @@ if not IS_OSS_BUILD:
 rn_xplat_cxx_library(
     name = "core",
     srcs = glob(
-        [
-            "**/*.cpp",
-        ],
+        ["**/*.cpp"],
+        excludes = glob(["tests/**/*.cpp"]),
     ),
     headers = glob(
-        [
-            "**/*.h",
-        ],
+        ["**/*.h"],
+        excludes = glob(["tests/**/*.h"]),
     ),
     header_namespace = "",
     exported_headers = subdir_glob(
@@ -42,6 +40,9 @@ rn_xplat_cxx_library(
         "-DLOG_TAG=\"ReactNative\"",
         "-DWITH_FBSYSTRACE=1",
     ],
+    tests = [
+        ":tests",
+    ],
     visibility = ["PUBLIC"],
     deps = [
         "xplat//fbsystrace:fbsystrace",
@@ -53,3 +54,24 @@ rn_xplat_cxx_library(
         react_native_xplat_target("fabric/graphics:graphics"),
     ],
 )
+
+if not IS_OSS_BUILD:
+    load("@xplat//configurations/buck:default_platform_defs.bzl", "APPLE")
+
+    cxx_test(
+        name = "tests",
+        srcs = glob(["tests/**/*.cpp"]),
+        contacts = ["oncall+react_native@xmail.facebook.com"],
+        compiler_flags = [
+            "-fexceptions",
+            "-frtti",
+            "-std=c++14",
+            "-Wall",
+        ],
+        platforms = APPLE,
+        deps = [
+            "xplat//folly:molly",
+            "xplat//third-party/gmock:gtest",
+            ":core",
+        ],
+    )

ReactCommon/fabric/core/tests/PrimitivesTest.cpp

@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <exception>
+
+#include <fabric/core/Sealable.h>
+#include <gtest/gtest.h>
+
+using namespace facebook::react;
+
+TEST(SealableTest, sealObjectCorrectly) {
+  Sealable obj;
+  ASSERT_FALSE(obj.getSealed());
+
+  obj.seal();
+  ASSERT_TRUE(obj.getSealed());
+}
+
+TEST(SealableTest, handleAssignmentsCorrectly) {
+  Sealable obj;
+  Sealable other;
+  EXPECT_NO_THROW(obj = other);
+
+  // Assignment after getting sealed is not allowed.
+  obj.seal();
+  Sealable other2;
+  EXPECT_THROW(obj = other2, std::runtime_error);
+
+  // It doesn't matter if the other object is also sealed, it's still not allowed.
+  other2.seal();
+  EXPECT_THROW(obj = other2, std::runtime_error);
+
+  // Fresh creation off other Sealable is still unsealed.
+  Sealable other3(obj);
+  ASSERT_FALSE(other3.getSealed());
+}