Fixed FileHandleTest.localFile test (#28)

Summary:
Pull Request resolved: #28

When running stress tests, multiple process/threads are running the same thing, reading/writing the same file "/tmp/test", which in turn creates a cross process/threads race condition.

Reviewed By: mbasmanova

Differential Revision: D30262592

fbshipit-source-id: 1e9d4f06abac78b098316c817b9960ef1a16b72a

velox/connectors/hive/FileHandleTest.cpp

@@ -14,27 +14,37 @@
 
 #include "velox/connectors/hive/FileHandle.h"
 
+#include <string>
+#include "gtest/gtest.h"
 #include "velox/common/caching/SimpleLRUCache.h"
 #include "velox/common/file/File.h"
 #include "velox/common/memory/Arena.h"
 
-#include "gtest/gtest.h"
-
 using namespace facebook::velox;
 
-TEST(FileHandle, localFile) {
+TEST(FileHandleTest, localFile) {
   // TODO: use the appropriate test directory.
-  const char filename[] = "/tmp/test";
-  remove(filename);
+  // Use unique name for each process/thread execution to prevent cross
+  // process/thread race condition
+  auto pid = getpid();
+  auto tid = pthread_self();
+  const std::string filename =
+      "/tmp/test" + std::to_string(pid) + "_" + std::to_string(tid);
+  remove(filename.data());
+
   {
     LocalWriteFile writeFile(filename);
     writeFile.append("foo");
   }
+
   FileHandleFactory factory(
       std::make_unique<SimpleLRUCache<std::string, FileHandle>>(1000),
       std::make_unique<FileHandleGenerator>());
   auto fileHandle = factory.generate(filename);
   ASSERT_EQ(fileHandle->file->size(), 3);
   Arena arena;
   ASSERT_EQ(fileHandle->file->pread(0, 3, &arena), "foo");
+
+  // Clean up
+  remove(filename.data());
 }