Adds sample test to check if URLs are validated

internal/feed_test.go

@@ -0,0 +1,11 @@
+package feed
+
+import "testing"
+
+func TestAdd(t *testing.T) {
+	gotErr := Add("gibberish")
+
+	if gotErr == nil {
+		t.Errorf("Expected Add function to throw an error if an invalid URL is provided")
+	}
+}