feat: handling content types in gin server

pkg/handlers.go

@@ -57,7 +57,16 @@ func GinHandler(c *gin.Context) {
 	}
 	currentTime := time.Now()
 	trucatedTime := truncateToSec(currentTime)
-	c.String(http.StatusOK, trucatedTime.String())
+
+	if strings.Contains(c.Request.Header.Get("content-type"), "text/plain") {
+		c.Writer.Header().Set("Content-Type", "text/plain")
+		c.String(http.StatusOK, trucatedTime.String())
+
+	} else if strings.Contains(c.Request.Header.Get("content-type"), "json") {
+
+		c.JSON(http.StatusOK, trucatedTime)
+	}
+
 }
 
 func GinHome(c *gin.Context) {

pkg/handlers_test.go

@@ -123,19 +123,34 @@ func TestGinHome(t *testing.T) {
 
 func TestGinHandler(t *testing.T) {
 
+	truncatedTime := truncateToSec(time.Now())
+	timeJson, err := json.Marshal(truncatedTime)
+	if err != nil {
+		t.Errorf("error converting to json: %v", err)
+	}
 	testcases := []struct {
 		testcaseName string
 		method       string
 		url          string
 		statusCode   int
-		expected     string
+		expected     any
+		contentType  string
 	}{
 		{
-			testcaseName: "correct method and url",
+			testcaseName: "correct method and url, plain text type",
+			method:       "GET",
+			url:          "/datetime",
+			statusCode:   200,
+			expected:     truncatedTime.String(),
+			contentType:  "text/plain",
+		},
+		{
+			testcaseName: "correct method and url, json type",
 			method:       "GET",
 			url:          "/datetime",
 			statusCode:   200,
-			expected:     truncateToSec(time.Now()).String(),
+			expected:     timeJson,
+			contentType:  "application/json",
 		},
 		{
 			testcaseName: "wrong method",
@@ -150,15 +165,16 @@ func TestGinHandler(t *testing.T) {
 		t.Run(testcase.testcaseName, func(t *testing.T) {
 
 			r := gin.Default()
-			if testcase.method == "GET" {
 
+			if testcase.method == "GET" {
 				r.GET(testcase.url, GinHandler)
 			} else {
 				r.POST(testcase.url, GinHandler)
-
 			}
 
 			req, err := http.NewRequest(testcase.method, testcase.url, nil)
+			req.Header.Add("content-type", testcase.contentType)
+
 			if err != nil {
 				t.Errorf("Error in new request %v", err)
 			}
@@ -169,7 +185,11 @@ func TestGinHandler(t *testing.T) {
 			if err != nil {
 				t.Errorf("Error reading response body %v", err)
 			}
-			assertEquality(t, testcase.expected, string(resBody))
+			if testcase.contentType == "application/json" {
+				assertEquality(t, testcase.expected, resBody)
+			} else {
+				assertEquality(t, testcase.expected, string(resBody))
+			}
 			assertEquality(t, testcase.statusCode, res.Code)
 
 		})