diff --git a/lib/urlenc/testdata/TestBasic.exp.txt b/lib/urlenc/testdata/TestBasic.exp.txt
new file mode 100644
index 000000000..14ce0930b
--- /dev/null
+++ b/lib/urlenc/testdata/TestBasic.exp.txt
@@ -0,0 +1 @@
+FMvBDcIwDEDRe6b4GYAFeuDOHbEAcmKjFFc4VbEQuyMGeG9OZ7JceOwxaf7qPlmTQ30Im9rw8E0TbwxrUmtd-BSIhesNC-4qhz07fV__nqmCpET5ll8AAAD__w==
\ No newline at end of file
diff --git a/lib/urlenc/urlenc_test.go b/lib/urlenc/urlenc_test.go
index c5b9a4866..21c33087d 100644
--- a/lib/urlenc/urlenc_test.go
+++ b/lib/urlenc/urlenc_test.go
@@ -16,6 +16,10 @@ I just forgot my whole philosophy of life!!!: {
 	encoded, err := Encode(script)
 	assert.Success(t, err)
 
+	// Make it explicit in PRs when encoding changes
+	// Something we might want to know for playground compatability
+	assert.Testdata(t, ".txt", []byte(encoded))
+
 	decoded, err := Decode(encoded)
 	assert.Success(t, err)