test: alter assert.strictEqual to default message

PR-URL: #15978
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-zlib-from-string.js

@@ -55,8 +55,7 @@ const expectedBase64Gzip = 'H4sIAAAAAAAAA11RS05DMQy8yhzg6d2BPSAkJPZu4laWkjiN4' +
                            'sHnHNzRtagj5AQAA';
 
 zlib.deflate(inputString, common.mustCall((err, buffer) => {
-  assert.strictEqual(buffer.toString('base64'), expectedBase64Deflate,
-                     'deflate encoded string should match');
+  assert.strictEqual(buffer.toString('base64'), expectedBase64Deflate);
 }));
 
 zlib.gzip(inputString, common.mustCall((err, buffer) => {
@@ -67,19 +66,16 @@ zlib.gzip(inputString, common.mustCall((err, buffer) => {
   // result that we're expecting, and this should match what we get
   // from inflating the known valid deflate data.
   zlib.gunzip(buffer, common.mustCall((err, gunzipped) => {
-    assert.strictEqual(gunzipped.toString(), inputString,
-                       'Should get original string after gzip/gunzip');
+    assert.strictEqual(gunzipped.toString(), inputString);
   }));
 }));
 
 let buffer = Buffer.from(expectedBase64Deflate, 'base64');
 zlib.unzip(buffer, common.mustCall((err, buffer) => {
-  assert.strictEqual(buffer.toString(), inputString,
-                     'decoded inflated string should match');
+  assert.strictEqual(buffer.toString(), inputString);
 }));
 
 buffer = Buffer.from(expectedBase64Gzip, 'base64');
 zlib.unzip(buffer, common.mustCall((err, buffer) => {
-  assert.strictEqual(buffer.toString(), inputString,
-                     'decoded gunzipped string should match');
+  assert.strictEqual(buffer.toString(), inputString);
 }));