add some missed assert messages

Author: zloirock

tests/unit-global/es.array.flat-map.js

@@ -16,10 +16,11 @@ QUnit.test('Array#flatMap', assert => {
   const array = [1];
   const context = {};
   array.flatMap(function (value, key, that) {
-    assert.same(value, 1);
-    assert.same(key, 0);
-    assert.same(that, array);
-    assert.same(this, context);
+    assert.same(arguments.length, 3, 'correct number of callback arguments');
+    assert.same(value, 1, 'correct value in callback');
+    assert.same(key, 0, 'correct index in callback');
+    assert.same(that, array, 'correct link to array in callback');
+    assert.same(this, context, 'correct callback context');
     return value;
   }, context);
   if (STRICT) {

tests/unit-global/es.map.group-by.js

@@ -20,8 +20,8 @@ QUnit.test('Map.groupBy', assert => {
 
   const element = {};
   groupBy([element], function (it, i) {
-    assert.same(arguments.length, 2);
-    assert.same(it, element);
-    assert.same(i, 0);
+    assert.same(arguments.length, 2, 'correct number of callback arguments');
+    assert.same(it, element, 'correct value in callback');
+    assert.same(i, 0, 'correct index in callback');
   });
 });

tests/unit-global/es.object.group-by.js

@@ -9,7 +9,7 @@ QUnit.test('Object.groupBy', assert => {
   assert.looksNative(groupBy);
   assert.nonEnumerable(Object, 'groupBy');
 
-  assert.same(getPrototypeOf(groupBy([], it => it)), null);
+  assert.same(getPrototypeOf(groupBy([], it => it)), null, 'null proto');
 
   assert.deepEqual(entries(groupBy([], it => it)), []);
   assert.deepEqual(entries(groupBy([1, 2], it => it ** 2)), [['1', [1]], ['4', [2]]]);
@@ -19,9 +19,9 @@ QUnit.test('Object.groupBy', assert => {
 
   const element = {};
   groupBy([element], function (it, i) {
-    assert.same(arguments.length, 2);
-    assert.same(it, element);
-    assert.same(i, 0);
+    assert.same(arguments.length, 2, 'correct number of callback arguments');
+    assert.same(it, element, 'correct value in callback');
+    assert.same(i, 0, 'correct index in callback');
   });
 
   const even = Symbol('even');

tests/unit-pure/es.array.flat-map.js

@@ -12,10 +12,11 @@ QUnit.test('Array#flatMap', assert => {
   const array = [1];
   const context = {};
   flatMap(array, function (value, index, that) {
-    assert.same(value, 1);
-    assert.same(index, 0);
-    assert.same(that, array);
-    assert.same(this, context);
+    assert.same(arguments.length, 3, 'correct number of callback arguments');
+    assert.same(value, 1, 'correct value in callback');
+    assert.same(index, 0, 'correct index in callback');
+    assert.same(that, array, 'correct link to array in callback');
+    assert.same(this, context, 'correct callback context');
     return value;
   }, context);
   if (STRICT) {

tests/unit-pure/es.map.group-by.js

@@ -20,8 +20,8 @@ QUnit.test('Map.groupBy', assert => {
 
   const element = {};
   groupBy([element], function (it, i) {
-    assert.same(arguments.length, 2);
-    assert.same(it, element);
-    assert.same(i, 0);
+    assert.same(arguments.length, 2, 'correct number of callback arguments');
+    assert.same(it, element, 'correct value in callback');
+    assert.same(i, 0, 'correct index in callback');
   });
 });

tests/unit-pure/es.object.group-by.js

@@ -9,7 +9,7 @@ QUnit.test('Object.groupBy', assert => {
   assert.arity(groupBy, 2);
   assert.name(groupBy, 'groupBy');
 
-  assert.same(getPrototypeOf(groupBy([], it => it)), null);
+  assert.same(getPrototypeOf(groupBy([], it => it)), null, 'null proto');
 
   assert.deepEqual(entries(groupBy([], it => it)), []);
   assert.deepEqual(entries(groupBy([1, 2], it => it ** 2)), [['1', [1]], ['4', [2]]]);
@@ -19,9 +19,9 @@ QUnit.test('Object.groupBy', assert => {
 
   const element = {};
   groupBy([element], function (it, i) {
-    assert.same(arguments.length, 2);
-    assert.same(it, element);
-    assert.same(i, 0);
+    assert.same(arguments.length, 2, 'correct number of callback arguments');
+    assert.same(it, element, 'correct value in callback');
+    assert.same(i, 0, 'correct index in callback');
   });
 
   const even = Symbol('even');