Add gtest

WORKSPACE

+# External dependency to grpc-enabled Google-styleprotobuf bulding
+# rules.  This method comes from
+# https://github.com/pubref/rules_protobuf#usage.
 git_repository(
     name = "org_pubref_rules_protobuf",
     remote = "https://github.com/pubref/rules_protobuf",
     tag = "v0.7.1",
 )
 
+# External dependency to gtest 1.7.0.  This method comes from
+# https://www.bazel.io/versions/master/docs/tutorial/cpp.html.
+new_http_archive(
+    name = "gtest",
+    url = "https://github.com/google/googletest/archive/release-1.7.0.zip",
+    sha256 = "b58cb7547a28b2c718d1e38aee18a3659c9e3ff52440297e965f5edffe34b6d0",
+    build_file = "third_party/gtest.BUILD",
+    strip_prefix = "googletest-release-1.7.0",
+)
+
+
 load("@org_pubref_rules_protobuf//cpp:rules.bzl", "cpp_proto_repositories")
 cpp_proto_repositories()

doc/getstarted/build_and_install/docker_install_en.rst

@@ -161,12 +161,13 @@ The general development workflow with Docker and Bazel is as follows:
       cd /paddle # where paddle source code has been mounted into the container
       mkdir -p build
       cd build
-      cmake ..
+      cmake -DWITH_TESTING=ON ..
       make -j `nproc`
+      CTEST_OUTPUT_ON_FAILURE=1 ctest
 
    or Bazel in the container:
 
    .. code-block:: bash
 
       cd /paddle
-      bazel build ...
+      bazel test ...

third_party/gtest.BUILD

+cc_library(
+    name = "main",
+    srcs = glob(
+        ["src/*.cc"],
+        exclude = ["src/gtest-all.cc"]
+    ),
+    hdrs = glob([
+        "include/**/*.h",
+        "src/*.h"
+    ]),
+    copts = ["-Iexternal/gtest/include"],
+    linkopts = ["-pthread"],
+    visibility = ["//visibility:public"],
+)

third_party/protobuf_test/BUILD

@@ -7,6 +7,7 @@ cpp_proto_library(
     protos = [
         "example.proto"
     ],
+    with_grpc = True,
 )
 
 cc_library(
@@ -15,3 +16,13 @@ cc_library(
     hdrs = ["example_lib.h"],
     deps = [":example_proto"],
 )
+
+cc_test(
+    name = "example_lib_test",
+    srcs = ["example_lib_test.cc"],
+    copts = ["-Iexternal/gtest/include"],
+    deps =[
+        "@gtest//:main",
+        ":example_lib",
+    ],
+)

third_party/protobuf_test/example.proto

 syntax = "proto3";
 
-package protos;
+package third_party.protobuf_test;
 
 message Greeting {
   string name = 1;

third_party/protobuf_test/example_lib.cc

 #include "third_party/protobuf_test/example_lib.h"
-#include <string>
 
-std::string get_greet(const ::protos::Greeting& who) {
+namespace third_party {
+namespace protobuf_test {
+
+std::string get_greet(const Greeting& who) {
   return "Hello " + who.name();
 }
+
+}  // namespace protobuf_test
+}  // namespace thrid_party

third_party/protobuf_test/example_lib.h

@@ -4,4 +4,10 @@
 
 #include <string>
 
-std::string get_greet(const ::protos::Greeting &who);
+namespace third_party {
+namespace protobuf_test {
+
+std::string get_greet(const Greeting &who);
+
+}  // namespace protobuf_test
+}  // namespace third_party

third_party/protobuf_test/example_lib_test.cc

+#include "third_party/protobuf_test/example_lib.h"
+
+#include "gtest/gtest.h"
+
+namespace third_party {
+namespace protobuf_test {
+
+TEST(ProtobufTest, GetGreet) {
+  Greeting g;
+  g.set_name("Paddle");
+  EXPECT_EQ("Hello Paddle", get_greet(g));
+}
+
+}  // namespace protobuf_test
+}  // namespace third_party