diff --git a/regexp_test.go b/regexp_test.go
new file mode 100644
index 0000000..21ee13f
--- /dev/null
+++ b/regexp_test.go
@@ -0,0 +1,27 @@
+package chroma
+
+import (
+	"testing"
+
+	"github.com/alecthomas/assert"
+)
+
+func TestNewlineAtEndOfFile(t *testing.T) {
+	l := Coalesce(MustNewLexer(&Config{EnsureNL: true}, Rules{
+		"root": {
+			{`(\w+)(\n)`, ByGroups(Keyword, Whitespace), nil},
+		},
+	}))
+	it, err := l.Tokenise(nil, `hello`)
+	assert.NoError(t, err)
+	assert.Equal(t, []*Token{{Keyword, "hello"}, {Whitespace, "\n"}}, it.Tokens())
+
+	l = Coalesce(MustNewLexer(nil, Rules{
+		"root": {
+			{`(\w+)(\n)`, ByGroups(Keyword, Whitespace), nil},
+		},
+	}))
+	it, err = l.Tokenise(nil, `hello`)
+	assert.NoError(t, err)
+	assert.Equal(t, []*Token{{Error, "hello"}}, it.Tokens())
+}