Rearrange stdlib unit tests across packages.

Rearrange JS stdlib unit tests.

libraries/stdlib/test/js/JsCollectionsTest.kt

@@ -0,0 +1,73 @@
+package test.collections.js
+
+import java.util.*
+
+import kotlin.test.*
+import org.junit.Test as test
+import kotlin.comparisons.*
+
+fun <T> List<T>.toArrayList() = this.toCollection(ArrayList<T>())
+
+class JsCollectionsTest {
+    val TEST_LIST = arrayOf(2, 0, 9, 7, 1).toList()
+    val SORTED_TEST_LIST = arrayOf(0, 1, 2, 7, 9).toList()
+    val MAX_ELEMENT = 9
+    val COMPARATOR = Comparator { x: Int, y: Int ->  if (x > y) 1 else if (x < y) -1 else 0 }
+
+    @test fun maxWithComparator() {
+        assertEquals(MAX_ELEMENT, Collections.max(TEST_LIST, COMPARATOR))
+    }
+
+    @test fun sort() {
+        val list = TEST_LIST.toArrayList()
+        Collections.sort(list)
+        assertEquals(SORTED_TEST_LIST, list)
+    }
+
+    @test fun sortWithComparator() {
+        val list = TEST_LIST.toArrayList()
+        Collections.sort(list, COMPARATOR)
+        assertEquals(SORTED_TEST_LIST, list)
+    }
+
+    @test fun collectionToArray() {
+        val array = TEST_LIST.toTypedArray()
+        assertEquals(array.toList(), TEST_LIST)
+    }
+
+    @test fun toListDoesNotCreateArrayView() {
+        snapshotDoesNotCreateView(arrayOf("first", "last"), { it.toList() })
+        snapshotDoesNotCreateView(arrayOf<Any>("item", 1), { it.toList() })
+    }
+
+    @test fun toMutableListDoesNotCreateArrayView() {
+        snapshotDoesNotCreateView(arrayOf("first", "last"), { it.toMutableList() })
+        snapshotDoesNotCreateView(arrayOf<Any>("item", 2), { it.toMutableList() })
+    }
+
+    @test fun listOfDoesNotCreateView() {
+        snapshotDoesNotCreateView(arrayOf("first", "last"), { listOf(*it) })
+        snapshotDoesNotCreateView(arrayOf<Any>("item", 3), { listOf(*it) })
+    }
+
+    @test fun mutableListOfDoesNotCreateView() {
+        snapshotDoesNotCreateView(arrayOf("first", "last"), { mutableListOf(*it) })
+        snapshotDoesNotCreateView(arrayOf<Any>("item", 4), { mutableListOf(*it) })
+    }
+
+    @test fun arrayListDoesNotCreateArrayView() {
+        snapshotDoesNotCreateView(arrayOf(1, 2), { arrayListOf(*it) })
+        snapshotDoesNotCreateView(arrayOf<Any>("first", "last"), { arrayListOf(*it) })
+    }
+
+
+    private fun <T> snapshotDoesNotCreateView(array: Array<T>, snapshot: (Array<T>) -> List<T>) {
+        val first = array.first()
+        val last = array.last()
+
+        val list = snapshot(array)
+        assertEquals(first, list[0])
+        array[0] = last
+        assertEquals(first, list[0])
+    }
+}