1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromBase64/target-size.js b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromBase64/target-size.js
new file mode 100644
index 0000000000..4e38423621
--- /dev/null
+++ b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromBase64/target-size.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.prototype.setfrombase64
+description: Uint8Array.prototype.setFromBase64 behavior when target buffer is small
+includes: [compareArray.js]
+features: [uint8array-base64, TypedArray]
+---*/
+
+// buffer too small
+var target = new Uint8Array([255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmFy');
+assert.sameValue(result.read, 4);
+assert.sameValue(result.written, 3);
+assert.compareArray(target, [102, 111, 111, 255, 255]);
+
+// buffer too small, padded
+var target = new Uint8Array([255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmE=');
+assert.sameValue(result.read, 4);
+assert.sameValue(result.written, 3);
+assert.compareArray(target, [102, 111, 111, 255]);
+
+// buffer exact
+var target = new Uint8Array([255, 255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmFy');
+assert.sameValue(result.read, 8);
+assert.sameValue(result.written, 6);
+assert.compareArray(target, [102, 111, 111, 98, 97, 114]);
+
+// buffer exact, padded
+var target = new Uint8Array([255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmE=');
+assert.sameValue(result.read, 8);
+assert.sameValue(result.written, 5);
+assert.compareArray(target, [102, 111, 111, 98, 97]);
+
+// buffer exact, not padded
+var target = new Uint8Array([255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmE');
+assert.sameValue(result.read, 7);
+assert.sameValue(result.written, 5);
+assert.compareArray(target, [102, 111, 111, 98, 97]);
+
+// buffer exact, padded, stop-before-partial
+var target = new Uint8Array([255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmE=', { lastChunkHandling: 'stop-before-partial' });
+assert.sameValue(result.read, 8);
+assert.sameValue(result.written, 5);
+assert.compareArray(target, [102, 111, 111, 98, 97]);
+
+// buffer exact, not padded, stop-before-partial
+var target = new Uint8Array([255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmE', { lastChunkHandling: 'stop-before-partial' });
+assert.sameValue(result.read, 4);
+assert.sameValue(result.written, 3);
+assert.compareArray(target, [102, 111, 111, 255, 255]);
+
+// buffer too large
+var target = new Uint8Array([255, 255, 255, 255, 255, 255, 255]);
+var result = target.setFromBase64('Zm9vYmFy');
+assert.sameValue(result.read, 8);
+assert.sameValue(result.written, 6);
+assert.compareArray(target, [102, 111, 111, 98, 97, 114, 255]);
+
+reportCompare(0, 0);