1 files changed, 17 insertions, 0 deletions
diff --git a/run_test.go b/run_test.go
new file mode 100644
index 0000000..79a5a55
--- /dev/null
+++ b/run_test.go
@@ -0,0 +1,17 @@
+package caesar
+
+import "testing"
+
+func TestCoder(t *testing.T) {
+	coder := Coder{Key: 1, Ranges: []RuneRange{{'a', 'z'}}}
+	t.Run("Encode", func(t *testing.T) {
+		if coder.Encode("abc") != "bcd" {
+			t.Fail()
+		}
+	})
+	t.Run("Decode", func(t *testing.T) {
+		if coder.Decode("bcd") != "abc" {
+			t.Fail()
+		}
+	})
+}