check-in acceptance test for configuration cache (#54)

* and by the way update spock to used groovy version

Signed-off-by: Andreas Schmid <service@aaschmid.de>

build.gradle

@@ -46,7 +46,7 @@ dependencies {
 
     integTestImplementation "org.assertj:assertj-core:3.13.2"
     integTestImplementation "org.junit.vintage:junit-vintage-engine:5.5.2"
-    integTestImplementation("org.spockframework:spock-core:1.3-groovy-2.4") {
+    integTestImplementation("org.spockframework:spock-core:1.3-groovy-2.5") {
         exclude module: "groovy-all"
     }
 }

src/integTest/groovy/de/aaschmid/gradle/plugins/cpd/test/CpdAcceptanceTest.groovy

@@ -658,4 +658,45 @@ class CpdAcceptanceTest extends IntegrationBaseSpec {
         secondResult.output.contains("BUILD SUCCESSFUL")
         !(secondResult.output =~ /CPD found duplicate code\. See the report at file:\/\/.*\/cpdCheck.vs/)
     }
+
+    @Issue("https://github.com/aaschmid/gradle-cpd-plugin/issues/54")
+    def "Cpd task can be loaded from the configuration cache"() {
+        given:
+        buildFileWithPluginAndRepos() << """
+            cpdCheck{
+                reports{
+                    csv.enabled = true
+                    xml.enabled = false
+                }
+                source files(${testPath(JAVA, 'de/aaschmid/clazz')})
+            }
+            """.stripIndent()
+
+        when:
+        def result = runWithoutDebug('--configuration-cache', 'cpdCheck')
+
+        then:
+        result.task(':cpdCheck').outcome == SUCCESS
+        result.output.contains('BUILD SUCCESSFUL')
+        result.output.contains('Configuration cache entry stored.')
+
+        def report = file('build/reports/cpd/cpdCheck.csv')
+        report.exists()
+        report.text == "lines,tokens,occurrences\n" // empty
+
+        when:
+        report.delete() // remove report in order to force re-execution of `cpdCheck`
+
+        and:
+        def result2 = runWithoutDebug('--configuration-cache', 'cpdCheck')
+
+        then:
+        result2.task(':cpdCheck').outcome == SUCCESS
+        result2.output.contains("BUILD SUCCESSFUL")
+        result2.output.contains('Configuration cache entry reused.')
+
+        def report2 = file('build/reports/cpd/cpdCheck.csv')
+        report2.exists()
+        report.text == "lines,tokens,occurrences\n" // empty
+    }
 }

src/integTest/groovy/de/aaschmid/gradle/plugins/cpd/test/IntegrationBaseSpec.groovy

@@ -84,6 +84,19 @@ abstract class IntegrationBaseSpec extends Specification {
         }
     }
 
+    protected BuildResult runWithoutDebug(String... arguments) {
+        try {
+            return GradleRunner.create()
+                .withProjectDir(testProjectDir.root)
+                .withArguments(arguments)
+                .withPluginClasspath()
+                .withDebug(false) // `true` fails if `--configuration-cache`, see https://github.com/gradle/gradle/issues/14125
+                .build()
+        } catch (UnexpectedBuildResultException e) {
+            return e.buildResult
+        }
+    }
+
     /**
      * As the Gradle test kit does not support the old plugin mechanism, this method generates a {@code buildscript}
      * code block with the same dependencies as {@link org.gradle.testkit.runner.GradleRunner#withPluginClasspath()} or