test: improve test-process-kill-pid

PR-URL: https://github.com/nodejs/node/pull/12588
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

test/parallel/test-process-kill-pid.js

@@ -17,16 +17,20 @@ const assert = require('assert');
 //
 // process.pid, String(process.pid): ourself
 
-assert.throws(function() { process.kill('SIGTERM'); }, TypeError);
-assert.throws(function() { process.kill(null); }, TypeError);
-assert.throws(function() { process.kill(undefined); }, TypeError);
-assert.throws(function() { process.kill(+'not a number'); }, TypeError);
-assert.throws(function() { process.kill(1 / 0); }, TypeError);
-assert.throws(function() { process.kill(-1 / 0); }, TypeError);
+assert.throws(function() { process.kill('SIGTERM'); },
+              /^TypeError: invalid pid$/);
+assert.throws(function() { process.kill(null); }, /^TypeError: invalid pid$/);
+assert.throws(function() { process.kill(undefined); },
+              /^TypeError: invalid pid$/);
+assert.throws(function() { process.kill(+'not a number'); },
+              /^TypeError: invalid pid$/);
+assert.throws(function() { process.kill(1 / 0); }, /^TypeError: invalid pid$/);
+assert.throws(function() { process.kill(-1 / 0); }, /^TypeError: invalid pid$/);
 
 // Test that kill throws an error for invalid signal
 
-assert.throws(function() { process.kill(1, 'test'); }, Error);
+assert.throws(function() { process.kill(1, 'test'); },
+              /^Error: Unknown signal: test$/);
 
 // Test kill argument processing in valid cases.
 //