Fix api name for fetching diff in harness driver (#268)

* Fix api name for fetching diff in harness driver

Author: shubham149

scm/driver/harness/git.go

@@ -80,7 +80,7 @@ func (s *gitService) ListChanges(ctx context.Context, repo, ref string, _ scm.Li
 
 func (s *gitService) CompareChanges(ctx context.Context, repo, source, target string, _ scm.ListOptions) ([]*scm.Change, *scm.Response, error) {
 	harnessURI := buildHarnessURI(s.client.account, s.client.organization, s.client.project, repo)
-	path := fmt.Sprintf("api/v1/repos/%s/compare/%s...%s", harnessURI, source, target)
+	path := fmt.Sprintf("api/v1/repos/%s/diff/%s...%s", harnessURI, source, target)
 	buf := new(strings.Builder)
 	res, err := s.client.do(ctx, "GET", path, nil, buf)
 	return convertCompareChanges(buf.String()), res, err

scm/driver/harness/git_test.go

@@ -215,7 +215,7 @@ func TestCompareChanges(t *testing.T) {
 	defer gock.Off()
 
 	gock.New(gockOrigin).
-		Get(fmt.Sprintf("/gateway/code/api/v1/repos/px7xd_BFRCi-pfWPYXVjvw/default/codeciintegration/thomas/+/compare/%s...%s", source, target)).
+		Get(fmt.Sprintf("/gateway/code/api/v1/repos/px7xd_BFRCi-pfWPYXVjvw/default/codeciintegration/thomas/+/diff/%s...%s", source, target)).
 		Reply(200).
 		Type("application/json").
 		File("testdata/gitdiff.json")