tests: Introduce torture_make_temp_dir()

Introduces a function to create temporary dir for testing purposes.
Also adds a minimal test for the temporary directory creation.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

tests/unittests/torture_temp_dir.c

@@ -0,0 +1,51 @@
+#include "config.h"
+
+#include "torture.h"
+#define LIBSSH_STATIC
+
+const char template[] = "temp_dir_XXXXXX";
+
+static int setup(void **state)
+{
+    char *temp_dir = NULL;
+
+    temp_dir = torture_make_temp_dir(template);
+    assert_non_null(temp_dir);
+
+    *state = (void *)temp_dir;
+
+    return 0;
+}
+
+static int teardown(void **state)
+{
+    char *temp_dir = *((char **)state);
+
+    torture_rmdirs((const char *)temp_dir);
+
+    free(temp_dir);
+
+    return 0;
+}
+
+
+static void torture_create_temp_dir(void **state)
+{
+    char *temp_dir = *((char **)state);
+
+    printf("Created temp dir: %s\n", temp_dir);
+}
+
+int torture_run_tests(void)
+{
+    int rc;
+    struct CMUnitTest tests[] = {
+        cmocka_unit_test_setup_teardown(torture_create_temp_dir, setup, teardown),
+    };
+
+    torture_filter_tests(tests);
+    rc = cmocka_run_group_tests(tests, NULL, NULL);
+
+    return rc;
+}
+