Allow user specify Content-Type header

internal/http/request_test.go

@@ -13,7 +13,7 @@ func TestReturnErrorOnInvalidURL(t *testing.T) {
 	defer gock.Off()
 	gock.New("").Reply(200)
 
-	err := Request("GET", "://", nil, nil)
+	err := Request("GET", "://", "", nil, nil)
 	if err == nil {
 		t.Errorf("Expected error not returned")
 	}
@@ -29,7 +29,7 @@ func TestRequestGivenMethod(t *testing.T) {
 	mock.Method = "FOO"
 	mock.Reply(200)
 
-	err := Request("FOO", "http://localhost", nil, nil)
+	err := Request("FOO", "http://localhost", "", nil, nil)
 	if err != nil {
 		t.Errorf("Unexpected error on request")
 	}
@@ -44,9 +44,9 @@ func TestReturnHTTPErrorAsIs(t *testing.T) {
 	customError := errors.New("FOO")
 	gock.New("http://localhost").ReplyError(customError)
 
-	err := Request("GET", "http://localhost", nil, nil)
+	err := Request("GET", "http://localhost", "", nil, nil)
 	if errors.Unwrap(err) != customError {
-		t.Errorf("Returned error is not the expected error")
+		t.Errorf("Returned error is not the expected error: '%v'", err)
 	}
 
 	if gock.IsDone() == false {
@@ -58,7 +58,7 @@ func TestReturnHTTPReasonAsErrorWhenUnsuccessful(t *testing.T) {
 	defer gock.Off()
 	gock.New("http://localhost").Reply(http.StatusTeapot)
 
-	err := Request("GET", "http://localhost", nil, nil)
+	err := Request("GET", "http://localhost", "", nil, nil)
 	if err == nil || err.Error() != http.StatusText(http.StatusTeapot) {
 		t.Errorf("Reason should be returned as an error")
 	}
@@ -75,7 +75,7 @@ func TestCopyResponseBodyToWriter(t *testing.T) {
 
 	rw := new(bytes.Buffer)
 
-	err := Request("GET", "http://localhost", nil, rw)
+	err := Request("GET", "http://localhost", "", nil, rw)
 	if err != nil {
 		t.Errorf("Unexpected error %v", err)
 	}
@@ -101,7 +101,7 @@ func TestWriteToDevNullWhenNoWriter(t *testing.T) {
 
 	defer func() { devnull = original }()
 
-	err := Request("GET", "http://localhost", nil, nil)
+	err := Request("GET", "http://localhost", "", nil, nil)
 	if err != nil {
 		t.Errorf("Unexpected error %v", err)
 	}
@@ -116,3 +116,20 @@ func TestWriteToDevNullWhenNoWriter(t *testing.T) {
 		t.Error("No expected endpoint called")
 	}
 }
+
+func TestSendContentType(t *testing.T) {
+	defer gock.Off()
+	gock.New("http://localhost").
+		MatchHeader("Content-Type", "foo/bar").
+		HeaderPresent("Content-Type").
+		Reply(http.StatusOK)
+
+	err := Request("GET", "http://localhost", "foo/bar", nil, nil)
+	if err != nil {
+		t.Errorf("Unexpected error '%v'", err.Error())
+	}
+
+	if gock.IsDone() == false {
+		t.Error("No expected endpoint called")
+	}
+}