refactor and add mixed

common/src/commonTest/kotlin/dev/inmo/micro_utils/common/MapDiffUtilsTests.kt

@@ -211,6 +211,24 @@ class MapDiffUtilsTests {
         )
     }
 
+    @Test
+    @OptIn(Warning::class)
+    fun testMapDiffMixed() {
+        val originalMap = mutableMapOf("a" to 1, "b" to 2, "c" to 3)
+        val diff = MapDiff(mapOf("b" to 2), mapOf("c" to (3 to 5)), mapOf("d" to 4))
+
+        originalMap.remove("b")
+        // change value
+        originalMap["c"] = 5
+        // add value
+        originalMap["d"] = 4
+
+        assertEquals(
+            mapOf("a" to 1, "c" to 5, "d" to 4),
+            originalMap
+        )
+    }
+
     @Test
     @OptIn(Warning::class)
     fun testApplyMapDiffMixed() {