tests: make tests reproducible

tests/mymod_test.v

@@ -1,17 +1,15 @@
 module main
 
 import os
-import v.util.diff
 import embedfs
 
 fn test_mymod() {
 	oldpwd := os.getwd()
-	expected_out := os.read_file('tests/mymod_test.out')!
+	expected := '{"some": "JSON data"}\n'
 	os.chdir('tests/mymod')!
 	gen := embedfs.generate('assets')!
 	os.write_file('assets_generated.v', gen)!
 	ret := os.execute('${os.quoted_path(@VEXE)} run .')
-	dump(diff.compare_text(ret.output, expected_out)!)
-	assert ret.output == expected_out
+	assert ret.output == expected
 	os.chdir(oldpwd)!
 }