diff --git a/machine_test.go b/machine_test.go
index bb5074e..4fa4579 100644
--- a/machine_test.go
+++ b/machine_test.go
@@ -4,11 +4,19 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
-func exec(t *testing.T, testCases []testCase) {
+func TestDefaultParsingMode(t *testing.T) {
+	m := NewMachine()
+	require.NotNil(t, m)
+	require.IsType(t, &machine{}, m)
+	require.Equal(t, DefaultParsingMode, m.(*machine).parsingMode)
+}
+
+func exec(t *testing.T, testCases []testCase, mode ParsingMode) {
 	for ii, tt := range testCases {
-		urn, err := NewMachine().Parse([]byte(tt.in))
+		urn, err := NewMachine(WithParsingMode(mode)).Parse([]byte(tt.in))
 		ok := err == nil
 
 		if ok {
@@ -18,18 +26,32 @@ func exec(t *testing.T, testCases []testCase) {
 			assert.Equal(t, tt.obj.SS, urn.SS, herror(ii, tt))
 			assert.Equal(t, tt.str, urn.String(), herror(ii, tt))
 			assert.Equal(t, tt.norm, urn.Normalize().String(), herror(ii, tt))
+			if mode == All || mode == RFC7643Only {
+				assert.Equal(t, tt.isSCIM, urn.IsSCIM(), herror(ii, tt))
+				// if tt.isSCIM {
+				// 	spew.Dump(urn.SCIM())
+				// }
+			}
 		} else {
 			assert.False(t, tt.ok, herror(ii, tt))
 			assert.Empty(t, urn, herror(ii, tt))
-			assert.Equal(t, tt.estr, err.Error())
+			assert.Equal(t, tt.estr, err.Error(), herror(ii, tt))
 		}
 	}
 }
 
-func TestParse(t *testing.T) {
-	exec(t, genericTestCases)
+func TestParse2141Only(t *testing.T) {
+	exec(t, urn2141OnlyTestCases, RFC2141Only)
+}
+
+func TestParseUrnLex2141Only(t *testing.T) {
+	exec(t, urnlexTestCases, RFC2141Only)
+}
+
+func TestSCIMOnly(t *testing.T) {
+	exec(t, scimOnlyTestCases, RFC7643Only)
 }
 
-func TestParseUrnLex(t *testing.T) {
-	exec(t, urnlexTestCases)
+func TestFallbackMode(t *testing.T) {
+	exec(t, fallbackTestCases, All)
 }