Commonize StringBuilder

libraries/stdlib/jvm/test/text/StringBuilderJVMTest.kt

@@ -1,26 +0,0 @@
-/*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package test.text
-
-import kotlin.test.*
-
-class StringBuilderJVMTest() {
-
-    @Test fun stringBuildWithInitialCapacity() {
-        val s = buildString(123) {
-            assertEquals(123, capacity())
-        }
-        assertEquals("", s)
-    }
-
-    @Test fun getAndSetChar() {
-        val sb = StringBuilder("abc")
-        sb[1] = 'z'
-
-        assertEquals("azc", sb.toString())
-        assertEquals('c', sb[2])
-    }
-}