translator: add tests for IntArray extensions

translator/src/test/kotlin/tests/input/array_extensions_1.txt

@@ -1,2 +1,5 @@
 array_extensions_1_copyOf() == 22
 array_extensions_1_copyOfRange() == 779
+array_extensions_1_copyOf_extend() == 340
+array_extensions_1_plus_element() == 2933
+array_extensions_1_plus_array() == 12132

translator/src/test/kotlin/tests/kotlin/array_extensions_1.kt

@@ -17,6 +17,15 @@ fun array_extensions_1_copyOf(): Int {
     return minimize[1] + minimize.size
 }
 
+fun array_extensions_1_copyOf_extend(): Int {
+    val array = IntArray(3)
+    array[0] = 1
+    array[1] = 20
+    array[2] = 333
+    val minimize = array.copyOf(7)
+    return minimize[2] + minimize[3] + minimize[4] + minimize[5] + minimize[6] + minimize.size
+}
+
 fun array_extensions_1_copyOfRange(): Int {
     val array = IntArray(7)
     array[0] = 1
@@ -30,4 +39,34 @@ fun array_extensions_1_copyOfRange(): Int {
     val minimize = array.copyOfRange(2, 4)
     val ans = minimize[0] + minimize[1] + minimize.size
     return ans
+}
+
+fun array_extensions_1_plus_element(): Int {
+    val array = IntArray(7)
+    array[0] = 1
+    array[1] = 20
+    array[2] = 333
+    array[3] = 444
+    array[4] = 555
+    array[5] = 666
+    array[6] = 777
+
+    val minimize = array.plus(2148)
+    return minimize[6] + minimize[7] + minimize.size
+}
+
+fun array_extensions_1_plus_array(): Int {
+    val array = IntArray(3)
+    array[0] = 1
+    array[1] = 20
+    array[2] = 333
+    val secondArray = IntArray(4)
+    secondArray[0] = 9999
+    secondArray[1] = 2789
+    secondArray[2] = 11792
+    secondArray[3] = 67820
+
+    val maximize = array.plus(secondArray)
+    val ans = maximize[2] + maximize[5] + maximize.size
+    return ans
 }