diff --git a/boa/src/builtins/bigint/tests.rs b/boa/src/builtins/bigint/tests.rs
index 92a230890e..c1c37b8fa1 100644
--- a/boa/src/builtins/bigint/tests.rs
+++ b/boa/src/builtins/bigint/tests.rs
@@ -1,4 +1,4 @@
-use crate::{forward, forward_val, Interpreter, Realm};
+use crate::{forward, Interpreter, Realm};
 
 #[test]
 fn equality() {
@@ -86,15 +86,16 @@ fn bigint_function_conversion_from_rational_with_fractional_part() {
     let mut engine = Interpreter::new(realm);
 
     let scenario = r#"
-        var x = false;
         try {
             BigInt(0.1);
         } catch (e) {
-            x = true;
+            e.toString();
         }
     "#;
-    forward_val(&mut engine, scenario).unwrap();
-    assert_eq!(forward(&mut engine, "x"), "true");
+    assert_eq!(
+        forward(&mut engine, scenario),
+        "TypeError: The number 0.1 cannot be converted to a BigInt because it is not an integer"
+    );
 }
 
 #[test]
@@ -103,15 +104,16 @@ fn bigint_function_conversion_from_null() {
     let mut engine = Interpreter::new(realm);
 
     let scenario = r#"
-        var x = false;
         try {
             BigInt(null);
         } catch (e) {
-            x = true;
+            e.toString();
         }
     "#;
-    forward_val(&mut engine, scenario).unwrap();
-    assert_eq!(forward(&mut engine, "x"), "true");
+    assert_eq!(
+        forward(&mut engine, scenario),
+        "TypeError: cannot convert null to a BigInt"
+    );
 }
 
 #[test]
@@ -120,15 +122,16 @@ fn bigint_function_conversion_from_undefined() {
     let mut engine = Interpreter::new(realm);
 
     let scenario = r#"
-        var x = false;
         try {
             BigInt(undefined);
         } catch (e) {
-            x = true;
+            e.toString();
         }
     "#;
-    forward_val(&mut engine, scenario).unwrap();
-    assert_eq!(forward(&mut engine, "x"), "true");
+    assert_eq!(
+        forward(&mut engine, scenario),
+        "TypeError: cannot convert undefined to a BigInt"
+    );
 }
 
 #[test]
diff --git a/boa/src/builtins/object/tests.rs b/boa/src/builtins/object/tests.rs
index 304097142e..68b30642bd 100644
--- a/boa/src/builtins/object/tests.rs
+++ b/boa/src/builtins/object/tests.rs
@@ -25,14 +25,14 @@ fn object_create_with_undefined() {
         try {
             const bar = Object.create();
         } catch (err) {
-            err.message
+            err.toString()
         }
         "#;
 
     let result = forward(&mut engine, init);
     assert_eq!(
         result,
-        "Object prototype may only be an Object or null: undefined"
+        "TypeError: Object prototype may only be an Object or null: undefined"
     );
 }
 
@@ -45,12 +45,15 @@ fn object_create_with_number() {
         try {
             const bar = Object.create(5);
         } catch (err) {
-            err.message
+            err.toString()
         }
         "#;
 
     let result = forward(&mut engine, init);
-    assert_eq!(result, "Object prototype may only be an Object or null: 5");
+    assert_eq!(
+        result,
+        "TypeError: Object prototype may only be an Object or null: 5"
+    );
 }
 
 #[test]
diff --git a/boa/src/exec/operator/tests.rs b/boa/src/exec/operator/tests.rs
index 4d4fcbe607..acabf87fe5 100644
--- a/boa/src/exec/operator/tests.rs
+++ b/boa/src/exec/operator/tests.rs
@@ -6,11 +6,11 @@ fn assignmentoperator_lhs_not_defined() {
         try {
           a += 5
         } catch (err) {
-          err.message
+          err.toString()
         }
         "#;
 
-    assert_eq!(&exec(scenario), "a is not defined");
+    assert_eq!(&exec(scenario), "ReferenceError: a is not defined");
 }
 
 #[test]
@@ -20,9 +20,9 @@ fn assignmentoperator_rhs_throws_error() {
           let a;
           a += b
         } catch (err) {
-          err.message
+          err.toString()
         }
         "#;
 
-    assert_eq!(&exec(scenario), "b is not defined");
+    assert_eq!(&exec(scenario), "ReferenceError: b is not defined");
 }
diff --git a/boa/src/exec/tests.rs b/boa/src/exec/tests.rs
index efc6b8e060..68cdaa39f6 100644
--- a/boa/src/exec/tests.rs
+++ b/boa/src/exec/tests.rs
@@ -1142,24 +1142,24 @@ fn not_a_function() {
         try {
             a();
         } catch(e) {
-            e.message
+            e.toString()
         }
     "#;
-    assert_eq!(forward(&mut engine, scenario), "not a function");
+    assert_eq!(forward(&mut engine, scenario), "TypeError: not a function");
     let scenario = r#"
         try {
             a.a();
         } catch(e) {
-            e.message
+            e.toString()
         }
     "#;
-    assert_eq!(forward(&mut engine, scenario), "not a function");
+    assert_eq!(forward(&mut engine, scenario), "TypeError: not a function");
     let scenario = r#"
         try {
             b();
         } catch(e) {
-            e.message
+            e.toString()
         }
     "#;
-    assert_eq!(forward(&mut engine, scenario), "not a function");
+    assert_eq!(forward(&mut engine, scenario), "TypeError: not a function");
 }