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diff --git a/tests/base64.scm b/tests/base64.scm
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+;;; Chickadee Game Toolkit
+;;; Copyright © 2023 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;; you may not use this file except in compliance with the License.
+;;; You may obtain a copy of the License at
+;;;
+;;;    http://www.apache.org/licenses/LICENSE-2.0
+;;;
+;;; Unless required by applicable law or agreed to in writing, software
+;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;; See the License for the specific language governing permissions and
+;;; limitations under the License.
+
+(define-module (tests base64)
+  #:use-module (chickadee base64)
+  #:use-module (rnrs bytevectors)
+  #:use-module (srfi srfi-64)
+  #:use-module (tests utils))
+
+(with-tests "base64"
+  (test-group "base64-decode"
+    (test-equal "encoded text no padding"
+      "hello!"
+      (utf8->string (base64-decode "aGVsbG8h")))
+    (test-equal "encoded text with one byte of padding"
+      "hello"
+      (utf8->string (base64-decode "aGVsbG8=")))
+    (test-equal "encoded text with two bytes of padding"
+      "what's up?"
+      (utf8->string (base64-decode "d2hhdCdzIHVwPw==")))))