diff --git a/test/built-ins/Temporal/Instant/fromEpochMilliseconds/argument.js b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/argument.js
new file mode 100644
index 0000000000..7fafd338d1
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/argument.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.fromepochmilliseconds
+description: >
+  TypeError thrown if input is of wrong primitive type.
+info: |
+  Temporal.Instant.fromEpochMilliseconds ( epochMilliseconds )
+
+  1. Set epochMilliseconds to ? ToNumber(epochMilliseconds).
+  ...
+features: [Temporal]
+---*/
+
+assert.throws(TypeError, () => Temporal.Instant.fromEpochMilliseconds(42n), "number");
+assert.throws(TypeError, () => Temporal.Instant.fromEpochMilliseconds(Symbol()), "symbol");
diff --git a/test/built-ins/Temporal/Instant/fromEpochMilliseconds/non-integer.js b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/non-integer.js
new file mode 100644
index 0000000000..b1e4af85fe
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/fromEpochMilliseconds/non-integer.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.fromepochmilliseconds
+description: >
+  RangeError thrown if input doesn't convert.
+info: |
+  Temporal.Instant.fromEpochMilliseconds ( epochMilliseconds )
+
+  ...
+  2. Set epochMilliseconds to ? NumberToBigInt(epochMilliseconds).
+  ...
+
+  NumberToBigInt ( number )
+
+  1. If number is not an integral Number, throw a RangeError exception.
+  ...
+features: [Temporal]
+---*/
+
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(), "undefined");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(undefined), "undefined");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(Infinity), "Infinity");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(-Infinity), "-Infinity");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(NaN), "NaN");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(1.3), "1.3");
+assert.throws(RangeError, () => Temporal.Instant.fromEpochMilliseconds(-0.5), "-0.5");
diff --git a/test/built-ins/Temporal/Instant/fromEpochNanoseconds/argument.js b/test/built-ins/Temporal/Instant/fromEpochNanoseconds/argument.js
new file mode 100644
index 0000000000..65684abd03
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/fromEpochNanoseconds/argument.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.fromepochnanoseconds
+description: >
+  TypeError thrown if input is of wrong primitive type.
+info: |
+  Temporal.Instant.fromEpochNanoseconds ( epochNanoseconds )
+
+  1. Set epochNanoseconds to ? ToBigInt(epochNanoseconds).
+  ...
+features: [Temporal]
+---*/
+
+assert.throws(TypeError, () => Temporal.Instant.fromEpochNanoseconds(), "undefined");
+assert.throws(TypeError, () => Temporal.Instant.fromEpochNanoseconds(undefined), "undefined");
+assert.throws(TypeError, () => Temporal.Instant.fromEpochNanoseconds(null), "null");
+assert.throws(TypeError, () => Temporal.Instant.fromEpochNanoseconds(42), "number");
+assert.throws(TypeError, () => Temporal.Instant.fromEpochNanoseconds(Symbol()), "symbol");
diff --git a/test/built-ins/Temporal/Instant/fromEpochNanoseconds/limits.js b/test/built-ins/Temporal/Instant/fromEpochNanoseconds/limits.js
new file mode 100644
index 0000000000..f5a5d0c113
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/fromEpochNanoseconds/limits.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.fromepochnanoseconds
+description: >
+  Throws a RangeError if the input is not a valid epoch nanoseconds value.
+info: |
+  Temporal.Instant.fromEpochNanoseconds ( epochNanoseconds )
+
+  ...
+  2. If IsValidEpochNanoseconds(epochNanoseconds) is false, throw a RangeError exception.
+  ...
+features: [Temporal]
+---*/
+
+var limit = 8640000000000000000000n;
+
+assert.throws(RangeError, () => Temporal.Instant.fromEpochNanoseconds(-limit - 1n));
+assert.throws(RangeError, () => Temporal.Instant.fromEpochNanoseconds(limit + 1n));
diff --git a/test/built-ins/Temporal/Instant/get-prototype-from-constructor-throws.js b/test/built-ins/Temporal/Instant/get-prototype-from-constructor-throws.js
new file mode 100644
index 0000000000..3a6c128fce
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/get-prototype-from-constructor-throws.js
@@ -0,0 +1,39 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant
+description: >
+  OrdinaryCreateFromConstructor returns with an abrupt completion.
+info: |
+  CreateTemporalInstant ( epochNanoseconds [ , newTarget ] )
+
+  ...
+  3. Let object be ? OrdinaryCreateFromConstructor(newTarget,
+     "%Temporal.Instant.prototype%", « [[InitializedTemporalInstant]], [[EpochNanoseconds]] »).
+  ...
+
+  OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , internalSlotsList ] )
+
+  ...
+  2. Let proto be ? GetPrototypeFromConstructor(constructor, intrinsicDefaultProto).
+  ...
+
+  GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto )
+
+  ...
+  2. Let proto be ? Get(constructor, "prototype").
+  ...
+
+features: [Temporal]
+---*/
+
+var newTarget = Object.defineProperty(function(){}.bind(), "prototype", {
+  get() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  Reflect.construct(Temporal.Instant, [0n], newTarget)
+});
diff --git a/test/built-ins/Temporal/Instant/large-bigint.js b/test/built-ins/Temporal/Instant/large-bigint.js
new file mode 100644
index 0000000000..aabf2bf279
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/large-bigint.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant
+description: >
+  Throws a RangeError if the input is far away from the epoch nanoseconds limits.
+features: [Temporal]
+---*/
+
+assert.throws(
+  RangeError,
+  () => new Temporal.Instant(2n ** 128n),
+  "2n ** 128n"
+);
+
+assert.throws(
+  RangeError,
+  () => new Temporal.Instant(-(2n ** 128n)),
+  "-(2n ** 128n)"
+);
diff --git a/test/built-ins/Temporal/Instant/prototype/toString/get-timezone-throws.js b/test/built-ins/Temporal/Instant/prototype/toString/get-timezone-throws.js
new file mode 100644
index 0000000000..5063829323
--- /dev/null
+++ b/test/built-ins/Temporal/Instant/prototype/toString/get-timezone-throws.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant.prototype.tostring
+description: >
+  Accessor property for "timeZone" throws an error.
+info: |
+  Temporal.Instant.prototype.toString ( [ options ] )
+
+  ...
+  9. Let timeZone be ? Get(resolvedOptions, "timeZone").
+  ...
+features: [Temporal]
+---*/
+
+var instance = new Temporal.Instant(0n);
+
+var options = {
+  get timeZone() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, () => instance.toString(options));