fix(napi): BigInt related APIs (#19174)

Doesn't make the API bullet-proof and there are some TODOs left,
but greatly improves the situation. Tests were ported from Node.js.

Closes https://github.com/denoland/deno/issues/18276.

1 files changed, 63 insertions, 0 deletions

diff --git a/test_napi/bigint_test.js b/test_napi/bigint_test.js
new file mode 100644
index 000000000..8d05f957d
--- /dev/null
+++ b/test_napi/bigint_test.js
@@ -0,0 +1,63 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import { assertEquals, assertThrows, loadTestLibrary } from "./common.js";
+
+const bi = loadTestLibrary();
+
+Deno.test("cases", function () {
+  const cases = [
+    0n,
+    -0n,
+    1n,
+    -1n,
+    100n,
+    2121n,
+    -1233n,
+    986583n,
+    -976675n,
+    98765432213456789876546896323445679887645323232436587988766545658n,
+    -4350987086545760976737453646576078997096876957864353245245769809n,
+  ];
+
+  for (const num of cases) {
+    if (num > -(2n ** 63n) && num < 2n ** 63n) {
+      assertEquals(bi.testInt64(num), num);
+      assertEquals(bi.isLossless(num, true), true);
+    } else {
+      assertEquals(bi.isLossless(num, true), false);
+    }
+
+    if (num >= 0 && num < 2n ** 64n) {
+      assertEquals(bi.testUint64(num), num);
+      assertEquals(bi.isLossless(num, false), true);
+    } else {
+      assertEquals(bi.isLossless(num, false), false);
+    }
+
+    assertEquals(bi.testWords(num), num);
+  }
+});
+
+Deno.test(
+  // TODO(bartlomieju): fix this test
+  { ignore: true },
+  function tooBigBigInt() {
+    assertThrows(
+      () => bi.createTooBigBigInt(),
+      Error,
+      "Invalid argument",
+    );
+  },
+);
+
+Deno.test(
+  // TODO(bartlomieju): fix this test
+  { ignore: true },
+  function exceptionForwarding() {
+    assertThrows(
+      () => bi.makeBigIntWordsThrow(),
+      Error,
+      "Maximum BigInt size exceeded",
+    );
+  },
+);