Add comprehensive tests of Kotlin extensions

This commit also removes extensions hidden by Java API (varargs).

spring-context/src/test/kotlin/org/springframework/context/annotation/AnnotationConfigApplicationContextExtensionsTests.kt

@@ -0,0 +1,26 @@
+package org.springframework.context.annotation
+
+import org.junit.Assert.assertNotNull
+import org.junit.Test
+import org.springframework.beans.factory.getBean
+import org.springframework.context.support.registerBean
+
+/**
+ * Tests for [AnnotationConfigApplicationContext] Kotlin extensions
+ *
+ * @author Sebastien Deleuze
+ */
+class AnnotationConfigApplicationContextExtensionsTests {
+ 
+    @Test
+    fun `Instantiate AnnotationConfigApplicationContext`() {
+        val applicationContext = AnnotationConfigApplicationContext {
+            registerBean<Foo>()
+        }
+        applicationContext.refresh()
+        assertNotNull(applicationContext)
+        assertNotNull(applicationContext.getBean<Foo>())
+    }
+
+    class Foo
+}

spring-context/src/test/kotlin/org/springframework/context/support/GenericApplicationContextExtensionsTests.kt

@@ -4,6 +4,11 @@ import org.junit.Assert.assertNotNull
 import org.junit.Test
 import org.springframework.beans.factory.getBean
 
+/**
+ * Tests for [GenericApplicationContext] Kotlin extensions
+ *
+ * @author Sebastien Deleuze
+ */
 class GenericApplicationContextExtensionsTests {
 
 	@Test
@@ -69,8 +74,8 @@ class GenericApplicationContextExtensionsTests {
 		assertNotNull(context.getBean<BeanB>())
 	}
 
-	internal class BeanA
+	class BeanA
 
-	internal class BeanB(val a: BeanA)
+	class BeanB(val a: BeanA)
 
 }

spring-context/src/test/kotlin/org/springframework/ui/ModelExtensionsTests.kt

@@ -21,6 +21,11 @@ import org.junit.Assert.assertTrue
 import org.junit.Test
 
 
+/**
+ * Tests for [Model] Kotlin extensions
+ *
+ * @author Sebastien Deleuze
+ */
 class ModelExtensionsTests {
 
 	@Test

spring-context/src/test/kotlin/org/springframework/ui/ModelMapExtensionsTests.kt

@@ -21,6 +21,11 @@ import org.junit.Assert.assertTrue
 import org.junit.Test
 
 
+/**
+ * Tests for [ModelMap] Kotlin extensions
+ *
+ * @author Sebastien Deleuze
+ */
 class ModelMapExtensionsTests {
 
 	@Test
@@ -30,4 +35,5 @@ class ModelMapExtensionsTests {
 		assertTrue(model.containsAttribute("foo"))
 		assertEquals("bing", model["foo"])
 	}
+
 }