add file_util unit tests

test/CMakeLists.txt

@@ -26,6 +26,7 @@ set (SRC
     copy.cpp
     build_graph.cpp
     eigen.cpp
+    file_util.cpp
     input_output_assign.cpp
     main.cpp
     op.cpp

test/file_util.cpp

+// ----------------------------------------------------------------------------
+// Copyright 2017 Nervana Systems Inc.
+// 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
+// ----------------------------------------------------------------------------
+
+#include <random>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "ngraph/file_util.hpp"
+
+using namespace std;
+using namespace ngraph;
+
+TEST(file_util, path_join)
+{
+    {
+        string s1 = "";
+        string s2 = "";
+
+        EXPECT_STREQ("", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "";
+        string s2 = "/test1/test2";
+
+        EXPECT_STREQ("/test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "";
+        string s2 = "/test1/test2/";
+
+        EXPECT_STREQ("/test1/test2/", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "";
+        string s2 = "test1/test2";
+
+        EXPECT_STREQ("test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+
+    {
+        string s1 = "/x1/x2";
+        string s2 = "";
+
+        EXPECT_STREQ("/x1/x2", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "/x1/x2/";
+        string s2 = "/";
+
+        EXPECT_STREQ("/", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "/x1/x2";
+        string s2 = "/test1/test2";
+
+        EXPECT_STREQ("/test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "/x1/x2/";
+        string s2 = "test1/test2";
+
+        EXPECT_STREQ("/x1/x2/test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "/x1/x2";
+        string s2 = "test1/test2";
+
+        EXPECT_STREQ("/x1/x2/test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+    {
+        string s1 = "/";
+        string s2 = "test1/test2";
+
+        EXPECT_STREQ("/test1/test2", file_util::path_join(s1, s2).c_str());
+    }
+}
+
+TEST(file_util, get_temp_directory)
+{
+    string tmp = file_util::get_temp_directory();
+    EXPECT_NE(0, tmp.size());
+}