Add tests checking encoding agnosticness

colorable_test.go

@@ -0,0 +1,30 @@
+package colorable
+
+import (
+	"bytes"
+	"testing"
+)
+
+// checkEncoding checks that colorable is output encoding agnostic as long as
+// the encoding is a superset of ASCII. This implies that one byte not part of
+// an ANSI sequence must give exactly one byte in output
+func checkEncoding(t *testing.T, data []byte) {
+	// Send non-UTF8 data to colorable
+	b := bytes.NewBuffer(make([]byte, 0, 10))
+	if b.Len() != 0 {
+		t.FailNow()
+	}
+	// TODO move colorable wrapping outside the test
+	c := NewNonColorable(b)
+	c.Write(data)
+	if b.Len() != len(data) {
+		t.Fatalf("%d bytes expected, got %d", len(data), b.Len())
+	}
+}
+
+func TestEncoding(t *testing.T) {
+	checkEncoding(t, []byte{})      // Empty
+	checkEncoding(t, []byte(`abc`)) // "abc"
+	checkEncoding(t, []byte(`é`))   // "é" in UTF-8
+	checkEncoding(t, []byte{233})   // 'é' in Latin-1
+}