[11.x] Add tests for Arr::divide (#51673)

* Add tests for Arr::divide

* fixes code style

* add tests

* update comments

tests/Support/SupportArrTest.php

@@ -105,11 +105,42 @@ public function testCrossJoin()
         $this->assertSame([[]], Arr::crossJoin());
     }
 
-    public function testDivide()
+    public function testDivide(): void
     {
+        // Test dividing an empty array
+        [$keys, $values] = Arr::divide([]);
+        $this->assertEquals([], $keys);
+        $this->assertEquals([], $values);
+
+        // Test dividing an array with a single key-value pair
         [$keys, $values] = Arr::divide(['name' => 'Desk']);
         $this->assertEquals(['name'], $keys);
         $this->assertEquals(['Desk'], $values);
+
+        // Test dividing an array with multiple key-value pairs
+        [$keys, $values] = Arr::divide(['name' => 'Desk', 'price' => 100, 'available' => true]);
+        $this->assertEquals(['name', 'price', 'available'], $keys);
+        $this->assertEquals(['Desk', 100, true], $values);
+
+        // Test dividing an array with numeric keys
+        [$keys, $values] = Arr::divide([0 => 'first', 1 => 'second']);
+        $this->assertEquals([0, 1], $keys);
+        $this->assertEquals(['first', 'second'], $values);
+
+        // Test dividing an array with null key
+        [$keys, $values] = Arr::divide([null => 'Null', 1 => 'one']);
+        $this->assertEquals([null, 1], $keys);
+        $this->assertEquals(['Null', 'one'], $values);
+
+        // Test dividing an array where the keys are arrays
+        [$keys, $values] = Arr::divide([['one' => 1, 2 => 'second'], 1 => 'one']);
+        $this->assertEquals([0, 1], $keys);
+        $this->assertEquals([['one' => 1, 2 => 'second'], 'one'], $values);
+
+        // Test dividing an array where the values are arrays
+        [$keys, $values] = Arr::divide([null => ['one' => 1, 2 => 'second'], 1 => 'one']);
+        $this->assertEquals([null, 1], $keys);
+        $this->assertEquals([['one' => 1, 2 => 'second'], 'one'], $values);
     }
 
     public function testDot()