increase coverage

Signed-off-by: Billy Zha <[email protected]>

test/e2e/suite/command/attach.go

@@ -138,7 +138,7 @@ var _ = Describe("ORAS beginners:", func() {
 var _ = Describe("1.1 registry users:", func() {
 	When("running attach command", func() {
 		It("should attach a file to a subject and output status", func() {
-			testRepo := attachTestRepo("simple")
+			testRepo := attachTestRepo("attach-tag")
 			CopyZOTRepo(ImageRepo, testRepo)
 			subjectRef := RegistryRef(ZOTHost, testRepo, foobar.Tag)
 			ORAS("attach", "--artifact-type", "test/attach", subjectRef, fmt.Sprintf("%s:%s", foobar.AttachFileName, foobar.AttachFileMedia)).
@@ -147,6 +147,16 @@ var _ = Describe("1.1 registry users:", func() {
 				MatchStatus([]match.StateKey{foobar.AttachFileStateKey}, false, 1).Exec()
 		})
 
+		It("should attach a file to a subject and output status", func() {
+			testRepo := attachTestRepo("attach-digest")
+			CopyZOTRepo(ImageRepo, testRepo)
+			subjectRef := RegistryRef(ZOTHost, testRepo, foobar.Digest)
+			ORAS("attach", "--artifact-type", "test/attach", subjectRef, fmt.Sprintf("%s:%s", foobar.AttachFileName, foobar.AttachFileMedia)).
+				WithWorkDir(PrepareTempFiles()).
+				MatchKeyWords(fmt.Sprintf("Attached to [registry] %s", subjectRef)).
+				MatchStatus([]match.StateKey{foobar.AttachFileStateKey}, false, 1).Exec()
+		})
+
 		It("should attach a file to an arch-specific subject", func() {
 			// prepare
 			testRepo := attachTestRepo("arch-specific")