Add more tests for invalid files

Author: parshap

test/test.js

@@ -18,7 +18,21 @@ test("get audio fingerprint", function(t) {
 });
 
 test("bad file path", function(t) {
-fpcalc("bad/path", function(err, result) {
+fpcalc("bad/path", function(err) {
+t.ok(err);
+t.end();
+});
+});
+
+test("no file path", function(t) {
+fpcalc(undefined, function(err) {
+t.ok(err);
+t.end();
+});
+});
+
+test("non-audio file", function(t) {
+fpcalc(path.join(__dirname, "/../index.js"), function(err) {
 t.ok(err);
 t.end();
 });