test: merge test with unnecessary child process

Test didn't require child process creation. While this test has not been
unstable, child process creation is slower and can be flaky in ci, so
test directly for the segfault regression.

PR-URL: nodejs#25025
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/parallel/test-crypto-hash.js

@@ -111,6 +111,17 @@ assert.throws(function() {
   crypto.createHash('xyzzy');
 }, /Digest method not supported/);
 
+// Issue https://github.com/nodejs/node/issues/9819: throwing encoding used to
+// segfault.
+common.expectsError(
+  () => crypto.createHash('sha256').digest({
+    toString: () => { throw new Error('boom'); },
+  }),
+  {
+    type: Error,
+    message: 'boom'
+  });
+
 // Default UTF-8 encoding
 const hutf8 = crypto.createHash('sha512').update('УТФ-8 text').digest('hex');
 assert.strictEqual(

test/parallel/test-crypto-hmac.js

@@ -21,6 +21,16 @@ common.expectsError(
     message: 'The "hmac" argument must be of type string. Received type object'
   });
 
+// This used to segfault. See: https://github.com/nodejs/node/issues/9819
+common.expectsError(
+  () => crypto.createHmac('sha256', 'key').digest({
+    toString: () => { throw new Error('boom'); },
+  }),
+  {
+    type: Error,
+    message: 'boom'
+  });
+
 common.expectsError(
   () => crypto.createHmac('sha1', null),
   {