Updated plugin to explicitly include Gradle Groovy plugin, so that this plugin can properly evaluate when included in a Gradle project that does not currently apply the Groovy plugin. Additionally, added unit tests to verify functionality provided by the plugin. Fixes gh-65 (#66)

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/src/main/groovy/org/springframework/cloud/contract/verifier/plugin/SpringCloudContractVerifierGradlePlugin.groovy

@@ -19,6 +19,7 @@ package org.springframework.cloud.contract.verifier.plugin
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.Task
+import org.gradle.api.plugins.GroovyPlugin
 import org.gradle.api.publish.maven.MavenPublication
 import org.gradle.api.publish.maven.plugins.MavenPublishPlugin
 import org.gradle.api.tasks.Copy
@@ -59,6 +60,9 @@ class SpringCloudContractVerifierGradlePlugin implements Plugin<Project> {
 	@Override
 	void apply(Project project) {
 		this.project = project
+
+		project.plugins.apply(GroovyPlugin)
+
 		ContractVerifierConfigProperties extension = project.extensions.create(EXTENSION_NAME, ContractVerifierConfigProperties)
 
 		project.check.dependsOn(GENERATE_SERVER_TESTS_TASK_NAME)

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/src/test/groovy/org/springframework/cloud/contract/verifier/plugin/ContractVerifierSpec.groovy

@@ -0,0 +1,136 @@
+package org.springframework.cloud.contract.verifier.plugin
+
+import org.gradle.api.Project
+import org.gradle.api.Task
+import org.gradle.api.plugins.GroovyPlugin
+import org.gradle.api.publish.PublishingExtension
+import org.gradle.api.publish.maven.plugins.MavenPublishPlugin
+import org.gradle.testfixtures.ProjectBuilder
+import org.springframework.cloud.contract.verifier.config.ContractVerifierConfigProperties
+import spock.lang.Specification
+
+class ContractVerifierSpec extends Specification {
+    protected Project project
+
+    def setup() {
+        def dateString = new Date().format("yyyy-MM-dd_HH-mm-ss")
+        def testFolder = new File("build/generated-tests/${getClass().simpleName}/${dateString}")
+        testFolder.mkdirs()
+        project = ProjectBuilder.builder().withProjectDir(testFolder).build()
+    }
+
+    def "Applies groovy plugin"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.plugins.hasPlugin(GroovyPlugin)
+    }
+
+    def "Creates contracts extension"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.extensions.findByType(ContractVerifierConfigProperties) != null
+    }
+
+    def "Creates generateContractTests task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.findByName("generateContractTests") != null
+    }
+
+    def "Configures generateContractTests task as a dependency of the check task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.check.getDependsOn().contains("generateContractTests")
+    }
+
+    def "Creates generateWireMockClientStubs task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.findByName("generateWireMockClientStubs") != null
+    }
+
+    def "Creates verifierStubsJar task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.findByName("verifierStubsJar") != null
+    }
+
+    def "Configures generateWireMockClientStubs task as a dependency of the verifierStubsJar task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.verifierStubsJar.getDependsOn().contains("generateWireMockClientStubs")
+    }
+
+    def "Creates copyContracts task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.tasks.findByName("copyContracts") != null
+    }
+
+    def "Configures copyContracts task as a dependency of the verifierStubsJar task"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+        Task copyContracts = project.tasks.copyContracts
+        assert copyContracts != null
+
+        expect:
+        project.tasks.verifierStubsJar.getDependsOn().contains(copyContracts)
+    }
+
+    /**
+     * project.evaluate() is used here in order to trigger the evaluation lifecycle of a project.
+     * This method is currently exposed via the internal API and is subject to change, however, Gradle
+     * does not yet expose a way to test this portion of the lifecycle.
+     */
+    def "Configures maven-publish plugin, if available"() {
+        given:
+        project.plugins.apply(MavenPublishPlugin)
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+        project.evaluate() // Currently internal method to trigger afterEvaluate blocks.
+
+        expect:
+        def publications = project.extensions.getByType(PublishingExtension).publications
+        publications.size() > 0
+        publications.findByName("stubs") != null
+    }
+
+    def "Adds wiremock as a testCompile dependency"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.configurations.testCompile.dependencies.find { it.group == "com.github.tomakehurst" && it.name == "wiremock" } != null
+    }
+
+    def "Adds jsonassert as a testCompile dependency"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.configurations.testCompile.dependencies.find { it.group == "com.toomuchcoding.jsonassert" && it.name == "jsonassert" } != null
+    }
+
+    def "Adds assertj-core as a testCompile dependency"() {
+        given:
+        project.plugins.apply(SpringCloudContractVerifierGradlePlugin)
+
+        expect:
+        project.configurations.testCompile.dependencies.find { it.group == "org.assertj" && it.name == "assertj-core" } != null
+    }
+}