test: sign with cmd not installed

refs #2651

internal/pipe/sign/sign_test.go

@@ -91,6 +91,20 @@ func TestSignArtifacts(t *testing.T) {
 		expectedErrMsg   string
 		user             string
 	}{
+		{
+			desc:           "sign cmd not found",
+			expectedErrMsg: `sign: not-a-valid-cmd failed: exec: "not-a-valid-cmd": executable file not found in $PATH: `,
+			ctx: context.New(
+				config.Project{
+					Signs: []config.Sign{
+						{
+							Artifacts: "all",
+							Cmd:       "not-a-valid-cmd",
+						},
+					},
+				},
+			),
+		},
 		{
 			desc:           "sign errors",
 			expectedErrMsg: "sign: exit failed",