Add test for merge3 filter

src/commonTest/kotlin/testMerge.kt

@@ -5,6 +5,7 @@ import net.sergeych.mp_logger.Log
 import net.sergeych.sprintf.sprintf
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertTrue
 
 val List<Char>.str: String get() = joinToString("")
 
@@ -105,4 +106,16 @@ class BasicTest {
         println(unchanged)
         assertEquals(0, unchanged.referenceIndex)
     }
+
+    @Test
+    fun testMergeFilter() {
+        Log.connectConsole()
+        val source = "lxcvv".toList()
+        val our = "lssdfasdwerwev".toList()
+        val their = "lxcvasdfasdfs".toList()
+        val result = merge3(source, their, our)
+        println("got result")
+        val unchanged = result.blocks.filter { it is MergedBlock.Unchanged }
+        assertTrue(true)
+    }
 }