Add a helper class to generate temp paths for tests

tests/CMakeLists.txt

@@ -1,11 +1,17 @@
-include_directories(../external/catch/single_include)
+include_directories(../external/catch/single_include .)
+
+set(HEADERS
+    util/test_file.hpp
+)
 
 set(SOURCES
     index_set.cpp
     main.cpp
-    parser.cpp)
+    parser.cpp
+    util/test_file.cpp
+)
 
-add_executable(tests ${SOURCES})
+add_executable(tests ${SOURCES} ${HEADERS})
 target_link_libraries(tests realm-object-store)
 
 add_custom_target(run-tests USES_TERMINAL DEPENDS tests COMMAND ./tests)

tests/util/test_file.cpp

@@ -0,0 +1,31 @@
+#include "util/test_file.hpp"
+
+#include <realm/disable_sync_to_disk.hpp>
+
+#include <cstdlib>
+#include <unistd.h>
+
+TestFile::TestFile()
+{
+    static std::string tmpdir = [] {
+        realm::disable_sync_to_disk();
+
+        const char* dir = getenv("TMPDIR");
+        if (dir && *dir)
+            return dir;
+        return "/tmp";
+    }();
+    path = tmpdir + "/realm.XXXXXX";
+    mktemp(&path[0]);
+    unlink(path.c_str());
+}
+
+TestFile::~TestFile()
+{
+    unlink(path.c_str());
+}
+
+InMemoryTestFile::InMemoryTestFile()
+{
+    in_memory = true;
+}

tests/util/test_file.hpp

@@ -0,0 +1,15 @@
+#ifndef REALM_TEST_UTIL_TEST_FILE_HPP
+#define REALM_TEST_UTIL_TEST_FILE_HPP
+
+#include "shared_realm.hpp"
+
+struct TestFile : realm::Realm::Config {
+    TestFile();
+    ~TestFile();
+};
+
+struct InMemoryTestFile : TestFile {
+    InMemoryTestFile();
+};
+
+#endif