Add native test setup

Author: vimpostor

tests/run-tests.sh

@@ -2,9 +2,6 @@
 
 set -e
 
-echo "a" > /tmp/a
-echo "b" > /tmp/b
-echo "c" > /tmp/c
 COPYCAT="/tmp/a /tmp/b" copycat -- tests
 
 echo -e "\nRunning benchmark without interception:"

tests/tests_general.c

@@ -25,6 +25,13 @@ void check_correct_fd(int fd) {
 	EXPECT(!a);
 }
 
+void setup() {
+	FILE *f = fopen("/tmp/b", "w");
+	EXPECT(f);
+	fprintf(f, "b");
+	fclose(f);
+}
+
 int do_open(const char *filename) {
 	return open(filename, O_RDONLY);
 }
@@ -40,6 +47,8 @@ int do_openat2(const char *filename) {
 
 int main(int argc, char *argv[])
 {
+	setup();
+
 	const char filename[] = "/tmp/a";
 	int f = -1;