diff --git a/datokenizer_test.go b/datokenizer_test.go
new file mode 100644
index 0000000..8945f91
--- /dev/null
+++ b/datokenizer_test.go
@@ -0,0 +1,40 @@
+package datokenizer
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSimpleString(t *testing.T) {
+	assert := assert.New(t)
+
+	// bau | bauamt
+	r := strings.NewReader(`##foma-net 1.0##
+##props##
+1 6 7 8 2 2 1 1 1 1 1 2 5B57D486
+##sigma##
+0 @_EPSILON_SYMBOL_@
+3 a
+4 b
+5 m
+6 t
+7 u
+##states##
+0 4 1 0
+1 3 2 0
+2 7 3 0
+3 3 4 1
+4 5 5 0
+5 6 6 0
+6 -1 -1 1
+-1 -1 -1 -1 -1
+##end##`)
+
+	tok := parse(r) // ("tokenizer.fst")
+	tok.buildDA()
+	assert.True(tok.match("bau"))
+	assert.True(tok.match("bauamt"))
+	assert.False(tok.match("baum"))
+}