test: improve test-process-chdir

remove typeError constructor and replace with regex string
to match typeError message

PR-URL: nodejs/node#12589
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Cai <davidcai1993@yahoo.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

test/parallel/test-process-chdir.js

@@ -30,7 +30,9 @@ process.chdir('..');
 assert.strictEqual(process.cwd().normalize(),
                    path.resolve(common.tmpDir).normalize());
 
-assert.throws(function() { process.chdir({}); }, TypeError, 'Bad argument.');
-assert.throws(function() { process.chdir(); }, TypeError, 'Bad argument.');
+assert.throws(function() { process.chdir({}); },
+              /^TypeError: Bad argument\.$/, 'Bad argument.');
+assert.throws(function() { process.chdir(); },
+              /^TypeError: Bad argument\.$/, 'Bad argument.');
 assert.throws(function() { process.chdir('x', 'y'); },
-              TypeError, 'Bad argument.');
+              /^TypeError: Bad argument\.$/, 'Bad argument.');