1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/last-chunk-handling.js b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/last-chunk-handling.js
new file mode 100644
index 0000000000..c78d15e869
--- /dev/null
+++ b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/last-chunk-handling.js
@@ -0,0 +1,67 @@
+// |reftest| shell-option(--enable-uint8array-base64) skip-if(!Uint8Array.fromBase64||!xulRuntime.shell) -- uint8array-base64 is not enabled unconditionally, requires shell-options
+// Copyright (C) 2024 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-uint8array.frombase64
+description: Handling of final chunks in Uint8Array.fromBase64
+includes: [compareArray.js]
+features: [uint8array-base64, TypedArray]
+---*/
+
+// padding
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg=='), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg==', { lastChunkHandling: 'loose' }), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg==', { lastChunkHandling: 'stop-before-partial' }), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg==', { lastChunkHandling: 'strict' }), [101, 120, 97, 102]);
+
+// no padding
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg'), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg', { lastChunkHandling: 'loose' }), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg', { lastChunkHandling: 'stop-before-partial' }), [101, 120, 97]);
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg', { lastChunkHandling: 'strict' });
+});
+
+// non-zero padding bits
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh=='), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh==', { lastChunkHandling: 'loose' }), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh==', { lastChunkHandling: 'stop-before-partial' }), [101, 120, 97, 102]);
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZh==', { lastChunkHandling: 'strict' });
+});
+
+// non-zero padding bits, no padding
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh'), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh', { lastChunkHandling: 'loose' }), [101, 120, 97, 102]);
+assert.compareArray(Uint8Array.fromBase64('ZXhhZh', { lastChunkHandling: 'stop-before-partial' }), [101, 120, 97]);
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZh', { lastChunkHandling: 'strict' });
+});
+
+// partial padding
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg=');
+});
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg=', { lastChunkHandling: 'loose' });
+});
+assert.compareArray(Uint8Array.fromBase64('ZXhhZg=', { lastChunkHandling: 'stop-before-partial' }), [101, 120, 97]);
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg=', { lastChunkHandling: 'strict' });
+});
+
+// excess padding
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg===');
+});
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg===', { lastChunkHandling: 'loose' });
+});
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg===', { lastChunkHandling: 'stop-before-partial' });
+});
+assert.throws(SyntaxError, function() {
+  Uint8Array.fromBase64('ZXhhZg===', { lastChunkHandling: 'strict' });
+});
+
+reportCompare(0, 0);