Fixed file_event_handlers test for windows

tests/test_file_helper.cpp

@@ -110,48 +110,48 @@ TEST_CASE("file_event_handlers", "[file_helper]")
         after_close
     };
     prepare_logdir();
-
+    
+    spdlog::filename_t test_filename{TEST_FILENAME};
     // define event handles that update vector of flags when called
     std::vector<flags> events;
     spdlog::file_event_handlers handlers;
     handlers.before_open = [&](spdlog::filename_t filename) {
-        REQUIRE(filename == TEST_FILENAME);
+        REQUIRE(filename == test_filename);
         events.push_back(flags::before_open);
     };
     handlers.after_open = [&](spdlog::filename_t filename, std::FILE* fstream) {
-        REQUIRE(filename == TEST_FILENAME);
+        REQUIRE(filename == test_filename);
         REQUIRE(fstream);
         fputs("after_open\n", fstream);
         events.push_back(flags::after_open);
     };
     handlers.before_close = [&](spdlog::filename_t filename, std::FILE* fstream) {
-        REQUIRE(filename == TEST_FILENAME);
+        REQUIRE(filename == test_filename);
         REQUIRE(fstream);
         fputs("before_close\n", fstream);
-        fflush(fstream);
         events.push_back(flags::before_close);
     };
     handlers.after_close = [&](spdlog::filename_t filename) {
-        REQUIRE(filename == TEST_FILENAME);
+        REQUIRE(filename == test_filename);
         events.push_back(flags::after_close);
     };
     {
         spdlog::details::file_helper helper{ handlers };
         REQUIRE(events.empty());
 
-        helper.open(TEST_FILENAME);
+        helper.open(test_filename);
         REQUIRE(events == std::vector<flags>{flags::before_open, flags::after_open});
 
         events.clear();
         helper.close();
         REQUIRE(events == std::vector<flags>{flags::before_close, flags::after_close});
-        REQUIRE(file_contents(TEST_FILENAME) == "after_open\nbefore_close\n");
+        REQUIRE(file_contents(test_filename) == "after_open\nbefore_close\n");
 
         helper.reopen(true);
         events.clear();
     }
     // make sure that the file_helper destrcutor calls the close callbacks if needed    
     REQUIRE(events == std::vector<flags>{flags::before_close, flags::after_close});
-    REQUIRE(file_contents(TEST_FILENAME) == "after_open\nbefore_close\n");
+    REQUIRE(file_contents(test_filename) == "after_open\nbefore_close\n");
 
 }
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