wantError: false,
		},
		{
			name:      "invalid port naming service",
			args:      []string{"--filename", invalidPortNamingSvcFile},
			wantError: true,
		},
		{
			name:      "filename missing",
			wantError: true,
		},
		{
			name: "valid resources from file",
			args: []string{"--filename", validFilenameYAML},
		},
		{
			name:      "extra args",

		case nil:
			t.Fatal("bytes.Buffer.ReadFrom didn't panic")
		case error:
			// this is the error string of errNegativeRead
			wantError := "bytes.Buffer: reader returned negative count from Read"
			if err.Error() != wantError {
				t.Fatalf("recovered panic: got %v, want %v", err.Error(), wantError)
			}
		default:
			t.Fatalf("unexpected panic value: %#v", err)
		}
	}()

	b.ReadFrom(new(negativeReader))
}