Remove JUnit 4 dependency from all modules except spring-test

This commit removes the JUnit 4 dependency from all modules except
spring-test which provides explicit JUnit 4 support.

This commit also includes the following.

- migration from JUnit 4 assertions to JUnit Jupiter assertions in all
  Kotlin tests
- migration from JUnit 4 assumptions in Spring's TestGroup support to
  JUnit Jupiter assumptions, based on org.opentest4j.TestAbortedException
- introduction of a new TestGroups utility class than can be used from
  existing JUnit 4 tests in the spring-test module in order to perform
  assumptions using JUnit 4's Assume class

See gh-23451

Author: sbrannen

build.gradle

@@ -138,9 +138,6 @@ configure(allprojects) { project ->
 	dependencies {
 		testCompile("org.junit.jupiter:junit-jupiter-api")
 		testCompile("org.junit.jupiter:junit-jupiter-params")
-		testCompile("junit:junit:4.13-beta-3") {
-			exclude group: "org.hamcrest", module: "hamcrest-core"
-		}
 		testCompile("org.mockito:mockito-core:3.0.0") {
 			exclude group: "org.hamcrest", module: "hamcrest-core"
 		}
@@ -151,7 +148,6 @@ configure(allprojects) { project ->
 		// Pull in the latest JUnit 5 Launcher API to ensure proper support in IDEs.
 		testRuntime("org.junit.platform:junit-platform-launcher")
 		testRuntime("org.junit.jupiter:junit-jupiter-engine")
-		testRuntime("org.junit.vintage:junit-vintage-engine")
 		testRuntime("org.apache.logging.log4j:log4j-core:${log4jVersion}")
 		testRuntime("org.apache.logging.log4j:log4j-slf4j-impl:${log4jVersion}")
 		testRuntime("org.apache.logging.log4j:log4j-jul:${log4jVersion}")

spring-beans/src/test/java/org/springframework/beans/factory/serviceloader/ServiceLoaderTests.java

@@ -26,7 +26,7 @@
 import org.springframework.beans.factory.support.RootBeanDefinition;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assume.assumeTrue;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
 
 /**
  * @author Juergen Hoeller

spring-beans/src/test/kotlin/org/springframework/beans/KotlinBeanUtilsTests.kt

@@ -16,7 +16,7 @@
 
 package org.springframework.beans
 
-import org.junit.Assert.*
+import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 
 /**

spring-beans/src/test/kotlin/org/springframework/beans/factory/annotation/KotlinAutowiredTests.kt

@@ -22,7 +22,8 @@ import org.springframework.beans.factory.support.DefaultListableBeanFactory
 import org.springframework.beans.factory.support.RootBeanDefinition
 import org.springframework.tests.sample.beans.TestBean
 
-import org.junit.Assert.*
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.fail
 import org.springframework.beans.factory.BeanCreationException
 import org.springframework.tests.sample.beans.Colour
 

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

@@ -16,7 +16,7 @@
 
 package org.springframework.context.annotation
 
-import org.junit.Assert.assertNotNull
+import org.junit.jupiter.api.Assertions.assertNotNull
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.getBean
 import org.springframework.context.support.registerBean

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

@@ -16,7 +16,8 @@
 
 package org.springframework.context.annotation
 
-import org.junit.Assert.*
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.fail
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.getBean
 import org.springframework.beans.factory.parsing.BeanDefinitionParsingException

spring-context/src/test/kotlin/org/springframework/context/annotation/Spr16022Tests.kt

@@ -16,7 +16,7 @@
 
 package org.springframework.context.annotation
 
-import org.junit.Assert.assertEquals
+import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.BeanFactory
 import org.springframework.beans.factory.getBean

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

@@ -16,7 +16,10 @@
 
 package org.springframework.context.support
 
-import org.junit.Assert.*
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.fail
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.NoSuchBeanDefinitionException
 import org.springframework.beans.factory.getBean
@@ -28,7 +31,7 @@ import java.util.stream.Collectors
 
 @Suppress("UNUSED_EXPRESSION")
 class BeanDefinitionDslTests {
-	
+
 	@Test
 	fun `Declare beans with the functional Kotlin DSL`() {
 		val beans = beans {
@@ -193,12 +196,12 @@ class BeanDefinitionDslTests {
 
 		try {
 			context.getBean<Foo>()
-			fail()
+			fail("should have thrown an Exception")
 		} catch (ignored: Exception) {
 		}
 		try {
 			context.getBean<FooFoo>()
-			fail()
+			fail("should have thrown an Exception")
 		} catch (ignored: Exception) {
 		}
 	}

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

@@ -16,7 +16,7 @@
 
 package org.springframework.context.support
 
-import org.junit.Assert.assertNotNull
+import org.junit.jupiter.api.Assertions.assertNotNull
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.getBean
 

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

@@ -16,8 +16,8 @@
 
 package org.springframework.ui
 
-import org.junit.Assert.assertEquals
-import org.junit.Assert.assertTrue
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 
 /**