Spock (#5952)

* BAEL-2364: Adds Spring Boot IntegrationTests with Spock Framework

* Adds o.b.boot.controller.rest.WebController as example controller
* Adds one Load Application Context Test
* Adds one WebMvcTest

* updated pom.xml's and README

* fixed module name

spring-boot-testing/src/test/groovy/org/baeldung/boot/LoadContextTest.groovy

@@ -0,0 +1,23 @@
+package org.baeldung.boot
+
+import org.baeldung.boot.controller.rest.WebController
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import spock.lang.Narrative
+import spock.lang.Specification
+import spock.lang.Title
+
+@Title("Application Specification")
+@Narrative("Specification which beans are expected")
+@SpringBootTest
+class LoadContextTest extends Specification {
+
+    @Autowired(required = false)
+    private WebController webController
+
+
+    def "when context is loaded then all expected beans are created"() {
+        expect: "the WebController is created"
+        webController
+    }
+}

spring-boot-testing/src/test/groovy/org/baeldung/boot/WebControllerTest.groovy

@@ -0,0 +1,43 @@
+package org.baeldung.boot
+
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers
+import spock.lang.Narrative
+import spock.lang.Specification
+import spock.lang.Title
+
+@Title("WebController Specification")
+@Narrative("The Specification of the behaviour of the WebController. It can greet a person, change the name and reset it to 'world'")
+@AutoConfigureMockMvc
+@WebMvcTest
+class WebControllerTest extends Specification {
+
+    @Autowired
+    private MockMvc mvc
+
+    def "when get is performed then the response has status 200 and content is 'Hello world!'"() {
+        expect: "Status is 200 and the response is 'Hello world!'"
+        mvc.perform(MockMvcRequestBuilders.get("/hello")).andExpect(MockMvcResultMatchers.status().isOk()).andReturn().response.contentAsString == "Hello world!"
+    }
+
+    def "when set and delete are performed then the response has status 204 and content changes as expected"() {
+        given: "a new name"
+        def NAME = "Emmy"
+
+        when: "the name is set"
+        mvc.perform(MockMvcRequestBuilders.put("/hello").content(NAME)).andExpect(MockMvcResultMatchers.status().isNoContent())
+
+        then: "the salutation uses the new name"
+        mvc.perform(MockMvcRequestBuilders.get("/hello")).andExpect(MockMvcResultMatchers.status().isOk()).andReturn().response.contentAsString == "Hello $NAME!"
+
+        when: "the name is deleted"
+        mvc.perform(MockMvcRequestBuilders.delete("/hello")).andExpect(MockMvcResultMatchers.status().isNoContent())
+
+        then: "the salutation uses the default name"
+        mvc.perform(MockMvcRequestBuilders.get("/hello")).andExpect(MockMvcResultMatchers.status().isOk()).andReturn().response.contentAsString == "Hello world!"
+    }
+}