diff --git a/test/built-ins/Temporal/Instant/from/argument-string.js b/test/built-ins/Temporal/Instant/from/argument-string.js
new file mode 100644
index 0000000000..3b75ad65a4
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/from/argument-string.js
@@ -0,0 +1,45 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.from
+description: Various string arguments.
+features: [Temporal]
+---*/
+
+const tests = [
+  ['1976-11-18T15:23z', 217178580000000000n],
+  ['1976-11-18T15:23:30.1Z', 217178610100000000n],
+  ['1976-11-18T15:23:30.12Z', 217178610120000000n],
+  ['1976-11-18T15:23:30.123Z', 217178610123000000n],
+  ['1976-11-18T15:23:30.1234Z', 217178610123400000n],
+  ['1976-11-18T15:23:30.12345Z', 217178610123450000n],
+  ['1976-11-18T15:23:30.123456Z', 217178610123456000n],
+  ['1976-11-18T15:23:30.1234567Z', 217178610123456700n],
+  ['1976-11-18T15:23:30.12345678Z', 217178610123456780n],
+  ['1976-11-18T15:23:30.123456789Z', 217178610123456789n],
+  ['1976-11-18T15:23:30,12Z', 217178610120000000n],
+  ['1976-11-18T15:23:30.12\u221202:00', 217185810120000000n],
+  ['\u2212009999-11-18T15:23:30.12Z', -377677326989880000000n],
+  ['19761118T15:23:30.1+00:00', 217178610100000000n],
+  ['1976-11-18T152330.1+00:00', 217178610100000000n],
+  ['1976-11-18T15:23:30.1+0000', 217178610100000000n],
+  ['1976-11-18T152330.1+0000', 217178610100000000n],
+  ['19761118T15:23:30.1+0000', 217178610100000000n],
+  ['19761118T152330.1+00:00', 217178610100000000n],
+  ['+0019761118T15:23:30.1+00:00', 217178610100000000n],
+  ['+001976-11-18T152330.1+00:00', 217178610100000000n],
+  ['+001976-11-18T15:23:30.1+0000', 217178610100000000n],
+  ['+001976-11-18T152330.1+0000', 217178610100000000n],
+  ['+0019761118T15:23:30.1+0000', 217178610100000000n],
+  ['+0019761118T152330.1+00:00', 217178610100000000n],
+  ['+0019761118T152330.1+0000', 217178610100000000n],
+  ['1976-11-18T15:23:30+00', 217178610000000000n],
+  ['1976-11-18T15Z', 217177200000000000n],
+  ['1976-11-18T15:23:30.123456789Z[u-ca=discord]', 217178610123456789n],
+];
+
+for (const [arg, expected] of tests) {
+  const result = Temporal.Instant.from(arg);
+  assert.sameValue(result.epochNanoseconds, expected, `Instant.from(${arg})`);
+}