Add integration test for API raw content reference formats (#24388)

This pull request adds an integration test to validate the behavior of
raw content API's reference handling for all supported formats .

close  #24242

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

tests/integration/api_repo_get_contents_test.go

@@ -4,6 +4,7 @@
 package integration
 
 import (
+	"io"
 	"net/http"
 	"net/url"
 	"testing"
@@ -159,3 +160,30 @@ func testAPIGetContents(t *testing.T, u *url.URL) {
 	req = NewRequestf(t, "GET", "/api/v1/repos/%s/%s/contents/%s?token=%s", user3.Name, repo3.Name, treePath, token2)
 	MakeRequest(t, req, http.StatusOK)
 }
+
+func TestAPIGetContentsRefFormats(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		file := "README.md"
+		sha := "65f1bf27bc3bf70f64657658635e66094edbcb4d"
+		content := "# repo1\n\nDescription for repo1"
+
+		noRef := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + file
+		refInPath := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + sha + "/" + file
+		refInQuery := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + file + "?ref=" + sha
+
+		resp := MakeRequest(t, NewRequest(t, http.MethodGet, noRef), http.StatusOK)
+		raw, err := io.ReadAll(resp.Body)
+		assert.NoError(t, err)
+		assert.EqualValues(t, content, string(raw))
+
+		resp = MakeRequest(t, NewRequest(t, http.MethodGet, refInPath), http.StatusOK)
+		raw, err = io.ReadAll(resp.Body)
+		assert.NoError(t, err)
+		assert.EqualValues(t, content, string(raw))
+
+		resp = MakeRequest(t, NewRequest(t, http.MethodGet, refInQuery), http.StatusOK)
+		raw, err = io.ReadAll(resp.Body)
+		assert.NoError(t, err)
+		assert.EqualValues(t, content, string(raw))
+	})
+}