add GetTweetRetweeters method

tweet_test.go

@@ -108,3 +108,19 @@ func TestLikeAndUnlikeTweet(t *testing.T) {
 		t.Error(err)
 	}
 }
+
+func TestGetTweetRetweeters(t *testing.T) {
+	if skipAuthTest {
+		t.Skip("Skipping test due to environment variable")
+	}
+	tweetId := "1792634158977568997"
+
+	retweeters, _, err := testScraper.GetTweetRetweeters(tweetId, 20, "")
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(retweeters) == 0 {
+		t.Error("0 tweet retweeters")
+	}
+}