test: use regular expressions in throw assertions

Test errors thrown in addons-napi/test_constructor more specifically.

PR-URL: #14318
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

test/addons-napi/test_constructor/test.js

@@ -13,7 +13,8 @@ assert.strictEqual(test_object.readwriteValue, 1);
 test_object.readwriteValue = 2;
 assert.strictEqual(test_object.readwriteValue, 2);
 
-assert.throws(() => { test_object.readonlyValue = 3; }, TypeError);
+assert.throws(() => { test_object.readonlyValue = 3; },
+              /^TypeError: Cannot assign to read only property 'readonlyValue' of object '#<MyObject>'$/);
 
 assert.ok(test_object.hiddenValue);
 
@@ -35,11 +36,13 @@ assert.ok(!propertyNames.includes('readonlyAccessor2'));
 test_object.readwriteAccessor1 = 1;
 assert.strictEqual(test_object.readwriteAccessor1, 1);
 assert.strictEqual(test_object.readonlyAccessor1, 1);
-assert.throws(() => { test_object.readonlyAccessor1 = 3; }, TypeError);
+assert.throws(() => { test_object.readonlyAccessor1 = 3; },
+              /^TypeError: Cannot assign to read only property 'readonlyAccessor1' of object '#<MyObject>'$/);
 test_object.readwriteAccessor2 = 2;
 assert.strictEqual(test_object.readwriteAccessor2, 2);
 assert.strictEqual(test_object.readonlyAccessor2, 2);
-assert.throws(() => { test_object.readonlyAccessor2 = 3; }, TypeError);
+assert.throws(() => { test_object.readonlyAccessor2 = 3; },
+              /^TypeError: Cannot assign to read only property 'readonlyAccessor2' of object '#<MyObject>'$/);
 
 // validate that static properties are on the class as opposed
 // to the instance