added gzip decompression of response body

reddit/reddit_test.go

@@ -1,7 +1,9 @@
 package reddit
 
 import (
+	"compress/gzip"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -271,3 +273,23 @@ func TestClient_Do_RateLimitError(t *testing.T) {
 	require.Equal(t, 600, resp.Rate.Used)
 	require.Equal(t, time.Now().Truncate(time.Second).Add(time.Minute*4), resp.Rate.Reset)
 }
+
+func TestClient_Do_Gzip(t *testing.T) {
+	client, mux := setup(t)
+	expected := map[string]string{
+		"message": "Hello!",
+	}
+	mux.HandleFunc("/api/v1/test", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("Content-Encoding", "gzip")
+		b, _ := json.Marshal(&expected)
+		zw := gzip.NewWriter(w)
+		zw.Write(b)
+		zw.Close()
+	})
+	req, err := client.NewRequest(http.MethodGet, "api/v1/test", nil)
+	require.NoError(t, err)
+	result := map[string]string{}
+	_, err = client.Do(ctx, req, &result)
+	require.NoError(t, err)
+	require.Equal(t, result, expected)
+}