diff --git a/winpr/libwinpr/file/test/TestFileWriteFile.c b/winpr/libwinpr/file/test/TestFileWriteFile.c
index a8283ee6d..4da99a85f 100644
--- a/winpr/libwinpr/file/test/TestFileWriteFile.c
+++ b/winpr/libwinpr/file/test/TestFileWriteFile.c
@@ -4,7 +4,130 @@
 #include <winpr/file.h>
 #include <winpr/windows.h>
 
+static const char* get_dir(char* filename, size_t len)
+{
+#if defined(WIN32)
+	if ((len == 0) || (strnlen_s(filename, len) == len))
+		return NULL;
+	char* ptr = strrchr(filename, '\\');
+#else
+	if ((len == 0) || (strnlen(filename, len) == len))
+		return NULL;
+	char* ptr = strrchr(filename, '/');
+#endif
+	if (!ptr)
+		return NULL;
+	*ptr = '\0';
+	return filename;
+}
+
+static BOOL get_tmp(char* path, size_t len)
+{
+#if defined(WIN32)
+	const char template[] = "tmpdir.XXXXXX";
+	strncmp(path, template, strnlen_s(template, len) + 1);
+	if (!mktemp_s(path))
+		return FALSE;
+	strcat_s(path, len, "\\testfile");
+	if (strnlen_s(path, len) + 10 > len)
+		return FALSE;
+#else
+	const char template[] = "/tmp/tmpdir.XXXXXX";
+	if (!strncpy(path, template, strnlen(template, len) + 1))
+		return FALSE;
+	if (!mkdtemp(path))
+		return FALSE;
+	if (strnlen(path, len) + 10 > len)
+		return FALSE;
+	strcat(path, "/testfile");
+#endif
+	return TRUE;
+}
+
+static BOOL test_write(const char* filename, const char* data, size_t datalen)
+{
+	BOOL rc = FALSE;
+
+	WINPR_ASSERT(filename);
+	WINPR_ASSERT(data);
+	WINPR_ASSERT(datalen > 0);
+
+	HANDLE hdl =
+	    CreateFileA(filename, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
+	if (!hdl || (hdl == INVALID_HANDLE_VALUE))
+		goto fail;
+
+	DWORD written = 0;
+	if (!WriteFile(hdl, data, datalen, &written, NULL))
+		goto fail;
+	if (written != datalen)
+		goto fail;
+
+	if (!FlushFileBuffers(hdl))
+		goto fail;
+
+	rc = TRUE;
+fail:
+	CloseHandle(hdl);
+	return rc;
+}
+
+static BOOL test_read(const char* filename, const char* data, size_t datalen)
+{
+	BOOL rc = FALSE;
+
+	WINPR_ASSERT(filename);
+	WINPR_ASSERT(data);
+	WINPR_ASSERT(datalen > 0);
+
+	char* cmp = calloc(datalen + 1, sizeof(char));
+	HANDLE hdl =
+	    CreateFileA(filename, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+	if (!hdl || (hdl == INVALID_HANDLE_VALUE) || !cmp)
+		goto fail;
+
+	DWORD read = 0;
+	if (!ReadFile(hdl, cmp, datalen, &read, NULL))
+		goto fail;
+	if (read != datalen)
+		goto fail;
+	if (memcmp(data, cmp, datalen) != 0)
+		goto fail;
+	if (FlushFileBuffers(hdl))
+		goto fail;
+
+	rc = TRUE;
+fail:
+	free(cmp);
+	CloseHandle(hdl);
+	return rc;
+}
+
 int TestFileWriteFile(int argc, char* argv[])
 {
-	return 0;
+	const char data[] = "sometesttext\nanother line\r\ngogogo\r\tfoo\t\r\n\r";
+	char filename[MAX_PATH] = { 0 };
+
+	int rc = -1;
+	if (!get_tmp(filename, sizeof(filename)))
+		goto fail;
+
+	if (!test_write(filename, data, sizeof(data)))
+		goto fail;
+
+	if (!test_read(filename, data, sizeof(data)))
+		goto fail;
+
+	rc = 0;
+fail:
+	if (!DeleteFile(filename))
+		rc = -2;
+
+	const char* d = get_dir(filename, sizeof(filename));
+	if (d)
+	{
+		if (!RemoveDirectory(d))
+			rc = -3;
+	}
+	return rc;
 }