test: add some test cases for validateOffsetLengthWrite

PR-URL: #21195
Reviewed-By: Ujjwal Sharma <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Weijia Wang <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>

Author: kakts

test/parallel/test-fs-util-validateoffsetlengthwrite.js

@@ -0,0 +1,55 @@
+// Flags: --expose-internals
+'use strict';
+
+const common = require('../common');
+
+const { validateOffsetLengthWrite } = require('internal/fs/utils');
+const { kMaxLength } = require('buffer');
+
+// RangeError when offset > byteLength
+{
+  const offset = 100;
+  const length = 100;
+  const byteLength = 50;
+  common.expectsError(
+    () => validateOffsetLengthWrite(offset, length, byteLength),
+    {
+      code: 'ERR_OUT_OF_RANGE',
+      type: RangeError,
+      message: 'The value of "offset" is out of range. ' +
+               `It must be <= ${byteLength}. Received ${offset}`
+    }
+  );
+}
+
+// RangeError when byteLength > kMaxLength, and length > kMaxLength - offset .
+{
+  const offset = kMaxLength;
+  const length = 100;
+  const byteLength = kMaxLength + 1;
+  common.expectsError(
+    () => validateOffsetLengthWrite(offset, length, byteLength),
+    {
+      code: 'ERR_OUT_OF_RANGE',
+      type: RangeError,
+      message: 'The value of "length" is out of range. ' +
+               `It must be <= ${kMaxLength - offset}. Received ${length}`
+    }
+  );
+}
+
+// RangeError when byteLength < kMaxLength, and length > byteLength - offset .
+{
+  const offset = kMaxLength - 150;
+  const length = 200;
+  const byteLength = kMaxLength - 100;
+  common.expectsError(
+    () => validateOffsetLengthWrite(offset, length, byteLength),
+    {
+      code: 'ERR_OUT_OF_RANGE',
+      type: RangeError,
+      message: 'The value of "length" is out of range. ' +
+               `It must be <= ${byteLength - offset}. Received ${length}`
+    }
+  );
+}