Create/update unit tests

cmd/server/api_test.go

@@ -0,0 +1,68 @@
+package main
+
+// http.HandleFunc("/api/cache", handleAPICache(connR))
+
+import (
+	"context"
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/ebosas/microservices/internal/models"
+	"github.com/go-redis/redis/v8"
+)
+
+var ctx = context.Background()
+
+// TestAPICache tests the cache API
+func TestAPICache(t *testing.T) {
+	s, err := miniredis.Run()
+	if err != nil {
+		t.Fatalf("miniredis connection: %s", err)
+	}
+	defer s.Close()
+
+	c := redis.NewClient(&redis.Options{Addr: s.Addr()})
+
+	testMsg := "This is a test!"
+	testUpdateRedis(t, c, testMsg)
+
+	req := httptest.NewRequest(http.MethodGet, "/api/cache", nil)
+	w := httptest.NewRecorder()
+	handler := handleAPICache(c)
+	handler(w, req)
+	res := w.Result()
+	defer res.Body.Close()
+
+	data, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Errorf("expected error to be nil got %v", err)
+	}
+	if !strings.Contains(string(data), testMsg) {
+		t.Errorf("test message not found: %q", testMsg)
+	}
+}
+
+// testUpdateRedis inserts a marshalled message into mock redis
+func testUpdateRedis(t *testing.T, c *redis.Client, message string) {
+	time := time.Now().UnixMilli()
+	inputMsg := models.Message{Text: message, Source: "back", Time: time}
+	messageJson, err := json.Marshal(inputMsg)
+	if err != nil {
+		t.Fatalf("marshal message: %s", err)
+	}
+
+	if _, err := c.Pipelined(ctx, func(pipe redis.Pipeliner) error {
+		pipe.LPush(ctx, "messages", messageJson)
+		pipe.LTrim(ctx, "messages", 0, 9)
+		pipe.Incr(ctx, "total")
+		return nil
+	}); err != nil {
+		t.Fatalf("update redis: %s", err)
+	}
+}