Introduce Kotlin examples for Bean Overrides (@⁠MockitoBean, etc.)

This commit introduces Kotlin examples in the reference manual for
@⁠MockitoBean, @⁠MockitoSpyBean, and @⁠TestBean.

Closes gh-36541

framework-docs/modules/ROOT/pages/testing/annotations/integration-spring/annotation-mockitobean.adoc

@@ -140,6 +140,21 @@ Java::
 	}
 ----
 <1> Replace the bean with type `CustomService` with a Mockito mock.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	class BeanOverrideTests {
+
+		@MockitoBean // <1>
+		lateinit var customService: CustomService
+
+		// tests...
+	}
+----
+<1> Replace the bean with type `CustomService` with a Mockito mock.
 ======
 
 In the example above, we are creating a mock for `CustomService`. If more than one bean
@@ -168,6 +183,22 @@ Java::
 	}
 ----
 <1> Replace the bean named `service` with a Mockito mock.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	class BeanOverrideTests {
+
+		@MockitoBean("service") // <1>
+		lateinit var customService: CustomService
+
+		// tests...
+
+	}
+----
+<1> Replace the bean named `service` with a Mockito mock.
 ======
 
 The following `@SharedMocks` annotation registers two mocks by-type and one mock by-name.
@@ -187,6 +218,19 @@ Java::
 ----
 <1> Register `OrderService` and `UserService` mocks by-type.
 <2> Register `PrintingService` mock by-name.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Target(AnnotationTarget.CLASS)
+	@Retention(AnnotationRetention.RUNTIME)
+	@MockitoBean(types = [OrderService::class, UserService::class]) // <1>
+	@MockitoBean(name = "ps1", types = [PrintingService::class]) // <2>
+	annotation class SharedMocks
+----
+<1> Register `OrderService` and `UserService` mocks by-type.
+<2> Register `PrintingService` mock by-name.
 ======
 
 The following demonstrates how `@SharedMocks` can be used on a test class.
@@ -217,6 +261,34 @@ Java::
 ----
 <1> Register common mocks via the custom `@SharedMocks` annotation.
 <2> Optionally inject mocks to _stub_ or _verify_ them.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	@SharedMocks // <1>
+	class BeanOverrideTests {
+
+		@Autowired
+		lateinit var orderService: OrderService // <2>
+
+		@Autowired
+		lateinit var userService: UserService // <2>
+
+		@Autowired
+		lateinit var ps1: PrintingService // <2>
+
+		// Inject other components that rely on the mocks.
+
+		@Test
+		fun testThatDependsOnMocks() {
+			// ...
+		}
+	}
+----
+<1> Register common mocks via the custom `@SharedMocks` annotation.
+<2> Optionally inject mocks to _stub_ or _verify_ them.
 ======
 
 TIP: The mocks can also be injected into `@Configuration` classes or other test-related
@@ -246,6 +318,21 @@ Java::
 	}
 ----
 <1> Wrap the bean with type `CustomService` with a Mockito spy.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	class BeanOverrideTests {
+
+		@MockitoSpyBean // <1>
+		lateinit var customService: CustomService
+
+		// tests...
+	}
+----
+<1> Wrap the bean with type `CustomService` with a Mockito spy.
 ======
 
 In the example above, we are wrapping the bean with type `CustomService`. If more than
@@ -271,6 +358,21 @@ Java::
 	}
 ----
 <1> Wrap the bean named `service` with a Mockito spy.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	class BeanOverrideTests {
+
+		@MockitoSpyBean("service") // <1>
+		lateinit var customService: CustomService
+
+		// tests...
+	}
+----
+<1> Wrap the bean named `service` with a Mockito spy.
 ======
 
 The following `@SharedSpies` annotation registers two spies by-type and one spy by-name.
@@ -290,6 +392,19 @@ Java::
 ----
 <1> Register `OrderService` and `UserService` spies by-type.
 <2> Register `PrintingService` spy by-name.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Target(AnnotationTarget.CLASS)
+	@Retention(AnnotationRetention.RUNTIME)
+	@MockitoSpyBean(types = [OrderService::class, UserService::class]) // <1>
+	@MockitoSpyBean(name = "ps1", types = [PrintingService::class]) // <2>
+	annotation class SharedSpies
+----
+<1> Register `OrderService` and `UserService` spies by-type.
+<2> Register `PrintingService` spy by-name.
 ======
 
 The following demonstrates how `@SharedSpies` can be used on a test class.
@@ -320,6 +435,34 @@ Java::
 ----
 <1> Register common spies via the custom `@SharedSpies` annotation.
 <2> Optionally inject spies to _stub_ or _verify_ them.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@SpringJUnitConfig(TestConfig::class)
+	@SharedSpies // <1>
+	class BeanOverrideTests {
+
+		@Autowired
+		lateinit var orderService: OrderService // <2>
+
+		@Autowired
+		lateinit var userService: UserService // <2>
+
+		@Autowired
+		lateinit var ps1: PrintingService // <2>
+
+		// Inject other components that rely on the spies.
+
+		@Test
+		fun testThatDependsOnMocks() {
+			// ...
+		}
+	}
+----
+<1> Register common spies via the custom `@SharedSpies` annotation.
+<2> Optionally inject spies to _stub_ or _verify_ them.
 ======
 
 TIP: The spies can also be injected into `@Configuration` classes or other test-related

framework-docs/modules/ROOT/pages/testing/annotations/integration-spring/annotation-testbean.adoc

@@ -73,6 +73,27 @@ Java::
 ----
 <1> Mark a field for overriding the bean with type `CustomService`.
 <2> The result of this static method will be used as the instance and injected into the field.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	class OverrideBeanTests {
+		@TestBean // <1>
+		lateinit var customService: CustomService
+
+		// test case body...
+
+		companion object {
+			@JvmStatic
+			fun customService(): CustomService { // <2>
+				return MyFakeCustomService()
+			}
+		}
+	}
+----
+<1> Mark a field for overriding the bean with type `CustomService`.
+<2> The result of this static method will be used as the instance and injected into the field.
 ======
 
 In the example above, we are overriding the bean with type `CustomService`. If more than
@@ -102,6 +123,28 @@ Java::
 <1> Mark a field for overriding the bean with name `service`, and specify that the
     factory method is named `createCustomService`.
 <2> The result of this static method will be used as the instance and injected into the field.
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	class OverrideBeanTests {
+		@TestBean(name = "service", methodName = "createCustomService") // <1>
+		lateinit var customService: CustomService
+
+		// test case body...
+
+		companion object {
+			@JvmStatic
+			fun createCustomService(): CustomService { // <2>
+				return MyFakeCustomService()
+			}
+		}
+	}
+----
+<1> Mark a field for overriding the bean with name `service`, and specify that the
+    factory method is named `createCustomService`.
+<2> The result of this static method will be used as the instance and injected into the field.
 ======
 
 [TIP]