diff --git a/nova_vm/src/ecmascript/builtins/text_processing/string_objects/string_constructor.rs b/nova_vm/src/ecmascript/builtins/text_processing/string_objects/string_constructor.rs
index 2ee1a7d0..d3b1b0bc 100644
--- a/nova_vm/src/ecmascript/builtins/text_processing/string_objects/string_constructor.rs
+++ b/nova_vm/src/ecmascript/builtins/text_processing/string_objects/string_constructor.rs
@@ -2,6 +2,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
+use crate::ecmascript::abstract_operations::testing_and_comparison::is_integral_number;
+use crate::ecmascript::abstract_operations::type_conversion::to_number;
 use crate::ecmascript::abstract_operations::type_conversion::to_string;
 use crate::ecmascript::builders::builtin_function_builder::BuiltinFunctionBuilder;
 use crate::ecmascript::builtins::ordinary::get_prototype_from_constructor;
@@ -170,9 +172,8 @@ impl StringConstructor {
         agent: &mut Agent,
         _this_value: Value,
         code_points: ArgumentsList,
-        gc: GcScope,
+        mut gc: GcScope,
     ) -> JsResult<Value> {
-        let gc = gc.nogc();
         // 3. Assert: If codePoints is empty, then result is the empty String.
         if code_points.is_empty() {
             return Ok(String::EMPTY_STRING.into_value());
@@ -190,7 +191,7 @@ impl StringConstructor {
                 return Err(agent.throw_exception(
                     ExceptionType::RangeError,
                     format!("{:?} is not a valid code point", next_cp),
-                    gc,
+                    gc.nogc(),
                 ));
             }
             // d. Set result to the string-concatenation of result and UTF16EncodeCodePoint(ℝ(nextCP)).
@@ -204,24 +205,29 @@ impl StringConstructor {
         // 2. For each element next of codePoints, do
         for next in code_points.iter() {
             // a. Let nextCP be ? ToNumber(next).
+            let next_cp = to_number(agent, next.into_value(), gc.reborrow())?.unbind();
             // b. If IsIntegralNumber(nextCP) is false, throw a RangeError exception.
+            if !is_integral_number(agent, next_cp, gc.reborrow()) {
+                return Err(agent.throw_exception(
+                    ExceptionType::RangeError,
+                    format!("{:?} is not a valid code point", next_cp.to_real(agent)),
+                    gc.nogc(),
+                ));
+            }
             // c. If ℝ(nextCP) < 0 or ℝ(nextCP) > 0x10FFFF, throw a RangeError exception.
-            let Value::Integer(next_cp) = next else {
-                unreachable!();
-            };
-            let next_cp = next_cp.into_i64();
+            let next_cp = next_cp.into_i64(agent);
             if !(0..=0x10FFFF).contains(&next_cp) {
                 return Err(agent.throw_exception(
                     ExceptionType::RangeError,
                     format!("{:?} is not a valid code point", next_cp),
-                    gc,
+                    gc.nogc(),
                 ));
             }
             // d. Set result to the string-concatenation of result and UTF16EncodeCodePoint(ℝ(nextCP)).
             result.push(char::from_u32(next_cp as u32).unwrap());
         }
         // 4. Return result.
-        Ok(String::from_string(agent, result, gc).into())
+        Ok(String::from_string(agent, result, gc.nogc()).into())
     }
 
     fn raw(
diff --git a/tests/expectations.json b/tests/expectations.json
index 2f30545c..68933066 100644
--- a/tests/expectations.json
+++ b/tests/expectations.json
@@ -5195,11 +5195,6 @@
   "built-ins/SharedArrayBuffer/zero-length.js": "CRASH",
   "built-ins/String/S15.5.5.1_A4_T1.js": "CRASH",
   "built-ins/String/S9.8_A5_T1.js": "FAIL",
-  "built-ins/String/fromCodePoint/argument-is-Symbol.js": "CRASH",
-  "built-ins/String/fromCodePoint/argument-is-not-integer.js": "CRASH",
-  "built-ins/String/fromCodePoint/argument-not-coercible.js": "CRASH",
-  "built-ins/String/fromCodePoint/number-is-out-of-range.js": "CRASH",
-  "built-ins/String/fromCodePoint/to-number-conversions.js": "CRASH",
   "built-ins/String/proto-from-ctor-realm.js": "FAIL",
   "built-ins/String/prototype/Symbol.iterator/this-val-non-obj-coercible.js": "CRASH",
   "built-ins/String/prototype/Symbol.iterator/this-val-to-str-err.js": "CRASH",
@@ -11361,7 +11356,12 @@
   "built-ins/isFinite/tonumber-operations.js": "FAIL",
   "built-ins/isNaN/tonumber-operations.js": "FAIL",
   "built-ins/parseFloat/S15.1.2.3_A6.js": "TIMEOUT",
+  "harness/assert-notsamevalue-tostring.js": "CRASH",
+  "harness/assert-obj.js": "CRASH",
+  "harness/assert-samevalue-objects.js": "CRASH",
+  "harness/assert-samevalue-tostring.js": "CRASH",
   "harness/assert-throws-same-realm.js": "FAIL",
+  "harness/assert-tostring.js": "CRASH",
   "harness/assertRelativeDateMs.js": "CRASH",
   "harness/asyncHelpers-throwsAsync-custom-typeerror.js": "CRASH",
   "harness/asyncHelpers-throwsAsync-func-throws-sync.js": "CRASH",
@@ -11375,11 +11375,15 @@
   "harness/asyncHelpers-throwsAsync-same-realm.js": "CRASH",
   "harness/asyncHelpers-throwsAsync-single-arg.js": "CRASH",
   "harness/deepEqual-array.js": "CRASH",
+  "harness/deepEqual-deep.js": "CRASH",
   "harness/deepEqual-mapset.js": "CRASH",
+  "harness/deepEqual-object.js": "CRASH",
   "harness/deepEqual-primitives-bigint.js": "CRASH",
   "harness/deepEqual-primitives.js": "FAIL",
   "harness/nativeFunctionMatcher.js": "CRASH",
   "harness/testTypedArray-conversions.js": "CRASH",
+  "harness/verifyProperty-desc-is-not-object.js": "CRASH",
+  "harness/verifyProperty-undefined-desc.js": "CRASH",
   "language/arguments-object/10.6-10-c-ii-1.js": "FAIL",
   "language/arguments-object/10.6-10-c-ii-2.js": "FAIL",
   "language/arguments-object/10.6-12-1.js": "FAIL",
diff --git a/tests/metrics.json b/tests/metrics.json
index 7648a1e5..ea72b7b4 100644
--- a/tests/metrics.json
+++ b/tests/metrics.json
@@ -1,11 +1,11 @@
 {
   "results": {
-    "crash": 14950,
-    "fail": 7662,
-    "pass": 24122,
+    "crash": 14931,
+    "fail": 7665,
+    "pass": 24138,
     "skip": 55,
     "timeout": 12,
     "unresolved": 0
   },
-  "total": 45299
+  "total": 46801
 }
\ No newline at end of file