1 files changed, 36 insertions, 0 deletions
diff --git a/entity/id_interleaved_test.go b/entity/id_interleaved_test.go
new file mode 100644
index 00000000..ef9218c9
--- /dev/null
+++ b/entity/id_interleaved_test.go
@@ -0,0 +1,36 @@
+package entity
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestInterleaved(t *testing.T) {
+	primary := Id("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWX______________")
+	secondary := Id("YZ0123456789+/________________________________________________")
+	expectedId := Id("aYbZc0def1ghij2klmn3opqr4stuv5wxyz6ABCD7EFGH8IJKL9MNOP+QRST/UVWX")
+
+	interleaved := CombineIds(primary, secondary)
+	require.Equal(t, expectedId, interleaved)
+
+	// full length
+	splitPrimary, splitSecondary := SeparateIds(interleaved.String())
+	require.Equal(t, string(primary[:50]), splitPrimary)
+	require.Equal(t, string(secondary[:14]), splitSecondary)
+
+	// partial
+	splitPrimary, splitSecondary = SeparateIds(string(expectedId[:7]))
+	require.Equal(t, string(primary[:4]), splitPrimary)
+	require.Equal(t, string(secondary[:3]), splitSecondary)
+
+	// partial
+	splitPrimary, splitSecondary = SeparateIds(string(expectedId[:10]))
+	require.Equal(t, string(primary[:6]), splitPrimary)
+	require.Equal(t, string(secondary[:4]), splitSecondary)
+
+	// partial
+	splitPrimary, splitSecondary = SeparateIds(string(expectedId[:16]))
+	require.Equal(t, string(primary[:11]), splitPrimary)
+	require.Equal(t, string(secondary[:5]), splitSecondary)
+}