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diff --git a/src/tests/file-utils.cpp b/src/tests/file-utils.cpp
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+/*
+ * Copyright (c) 2020 [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ * 2.  Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "rnp_tests.h"
+#include "file-utils.h"
+
+TEST_F(rnp_tests, test_rnp_mkstemp)
+{
+#ifdef _WIN32
+    const char  tmpl[17] = "test-file.XXXXXX";
+    char        buf[17];
+    const int   size = 20;
+    int         fds[size];
+    std::string filenames[size];
+    for (int i = 0; i < size; i++) {
+        memcpy(buf, tmpl, sizeof(buf));
+        int fd = rnp_mkstemp(buf);
+        assert_int_not_equal(-1, fd);
+        fds[i] = fd;
+        filenames[i] = buf;
+    }
+    assert_false(filenames[0] == filenames[1]);
+    for (int i = 0; i < size; i++) {
+        if (fds[i] != -1) {
+            assert_int_equal(0, close(fds[i]));
+            assert_int_equal(0, unlink(filenames[i].c_str()));
+        }
+    }
+#endif
+}
+
+TEST_F(rnp_tests, test_rnp_access)
+{
+#ifdef _WIN32
+    /* Assume we are running as non-Administrator user */
+    assert_int_equal(0, rnp_access("C:\\Windows", F_OK));
+    assert_int_equal(0, rnp_access("C:\\Windows", R_OK));
+    assert_int_equal(0, rnp_access("C:\\Windows", W_OK));
+    assert_int_equal(0, rnp_access("C:\\Windows\\System32\\User32.dll", F_OK));
+    assert_int_equal(0, rnp_access("C:\\Windows\\System32\\User32.dll", R_OK));
+    /* Should fail, but unfortunately _waccess() works this way */
+    assert_int_equal(0, rnp_access("C:\\Windows\\System32\\User32.dll", W_OK));
+#else
+    /* Assume we are running as non-root and root directory is non-writeable for us */
+    assert_int_equal(0, rnp_access("/", F_OK));
+    assert_int_equal(0, rnp_access("/", R_OK));
+    assert_int_equal(-1, rnp_access("/", W_OK));
+    assert_int_equal(0, rnp_access("/tmp", R_OK | W_OK));
+#endif
+}