Rename tests/ -> test/ and update internal refs.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/systemf.c

@@ -0,0 +1,36 @@
+#include <err.h>
+#include "check.h"
+
+int main(void)
+{
+	struct { char *cmd; int rc; } list[] = {
+		{ "/app/enoent",  127 },
+		{ "false",          1 },
+		{ "true",           0 },
+		{ "kill -9 $$",    -1 },
+		{ "kill -QUIT $$", -1 },
+		{ "kill -INT $$",  -1 }
+	};
+
+	for (size_t i = 0; i < NELEMS(list); i++) {
+		int rc;
+
+		rc = systemf("%s", list[i].cmd);
+		if (rc != list[i].rc) {
+			if (rc == -1)
+				err(rc, "Failed %s", list[i].cmd);
+			else
+				errx(rc, "Failed %s, rc %d vs %d", list[i].cmd, rc, list[i].rc);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */
+