Minor: normalize '@Test' annotation casing in all tests.

libraries/stdlib/test/language/EscapedTestNamesTest.kt

@@ -1,17 +1,17 @@
 @file:kotlin.jvm.JvmVersion // TODO: Can't run in JS: spaces in function name KT-4160
 package test.language
 
-import org.junit.Test as test
+import org.junit.Test
 import kotlin.test.*
 
 class EscapedTestNamesTest {
 
-    @test fun `strings equal`() {
+    @Test fun `strings equal`() {
         val actual = "abc"
         assertEquals("abc", actual)
     }
 
-    @test fun `numbers equal`() {
+    @Test fun `numbers equal`() {
         val actual = 5
         assertEquals(5, actual)
     }