Added cobertura plugin to compute code coverage by spock tests

A new task "cobertura" is added to generate the code coverage report.

Also, fixed the unusedClassImports error by CodeNarc.

References #175

build.gradle

@@ -4,12 +4,14 @@ plugins {
     id 'com.github.johnrengelman.shadow' version '1.2.0'
     id "com.github.samueltbrown.cucumber" version "0.8"
     id "com.github.tkruse.groovysh" version "1.0.4"
+    id "net.saliman.cobertura" version "2.2.8"
 }
 
 apply plugin: 'eclipse'
 apply plugin: 'groovy'
 apply plugin: 'application'
 apply plugin: 'codenarc'
+apply plugin: 'cobertura'
 
 version = '0.3.0'
 group = 'com.github.lookout'
@@ -90,6 +92,17 @@ codenarc {
     configFile = file('gradle/codenarc/codenarc.xml')
 }
 
+cobertura {
+    coverageSourceDirs = [sourceSets.main.groovy.srcDirs]
+    coverageTestTasks {
+        project.tasks.matching {
+            it.name.contains("test")
+        }
+    }
+    coverageIgnoreTrivial = true
+    coverageIgnores = ['org.slf4j.Logger.*']
+}
+
 cucumber {
     formats = ['pretty',
                 // .toString() required here to make sure we convert a Groovy

src/test/groovy/deploydb/IntegrationModelHelper.groovy

@@ -1,6 +1,5 @@
 package deploydb
 
-import deploydb.models.Artifact
 import javax.ws.rs.core.Response
 
 class IntegrationModelHelper {

src/test/groovy/deploydb/WorkFlowSpec.groovy

@@ -2,7 +2,6 @@ package deploydb
 
 import deploydb.dao.FlowDAO
 import deploydb.dao.ModelConfigDAO
-import deploydb.models.Flow
 import spock.lang.*
 
 class WorkFlowSpec extends Specification {

src/test/groovy/deploydb/auth/LdapAuthenticatorSpec.groovy

@@ -4,7 +4,6 @@ import com.google.common.base.Optional
 import deploydb.IntegrationModelHelper
 import deploydb.IntegrationTestAppHelper
 import deploydb.ModelConfigHelper
-import dropwizardintegtest.TestLdapServer
 import io.dropwizard.auth.basic.BasicCredentials
 import javax.naming.AuthenticationException
 import javax.naming.NamingEnumeration
@@ -14,7 +13,6 @@ import javax.naming.directory.InitialDirContext
 import javax.naming.directory.SearchResult
 import spock.lang.*
 
-import javax.validation.OverridesAttribute
 
 class LdapAuthenticatorSpec extends Specification {
 

src/test/groovy/deploydb/models/EnvironmentSpec.groovy

@@ -1,12 +1,10 @@
 package deploydb.models
 
-import spock.lang.*
-import com.fasterxml.jackson.annotation.JsonProperty
 import io.dropwizard.configuration.ConfigurationParsingException
 import io.dropwizard.configuration.ConfigurationValidationException 
 import deploydb.ModelLoader
 import deploydb.registry.ModelRegistry
-import deploydb.models.Environment
+import spock.lang.*
 
 class EnvironmentSpec extends Specification {
     def "ensure Environment object can be instantiated"() {

src/test/groovy/deploydb/models/ServiceSpec.groovy

@@ -1,12 +1,11 @@
 package deploydb.models
 
-import spock.lang.*
-import com.fasterxml.jackson.annotation.JsonProperty
 import io.dropwizard.configuration.ConfigurationParsingException
 import io.dropwizard.configuration.ConfigurationValidationException 
 import deploydb.ModelLoader
 import deploydb.registry.ModelRegistry
-import deploydb.models.Service
+import spock.lang.*
+
 
 class ServiceSpec extends Specification {
     def "ensure Service object can be instantiated"() {

src/test/groovy/deploydb/models/promotion/PromotionSpec.groovy

@@ -5,9 +5,9 @@ import deploydb.auth.User
 import deploydb.registry.ModelRegistry
 import io.dropwizard.configuration.ConfigurationParsingException
 import io.dropwizard.configuration.ConfigurationValidationException
-import spock.lang.Ignore
 import spock.lang.Specification
 
+
 class PromotionSpec extends Specification {
     def "ensure Promotion object can be instantiated"() {
         when:

src/test/groovy/deploydb/models/webhooks/WebhookSpec.groovy

@@ -1,17 +1,10 @@
 package deploydb.models
 
-
-import spock.lang.*
-import com.fasterxml.jackson.annotation.JsonProperty
 import io.dropwizard.configuration.ConfigurationParsingException
-import io.dropwizard.configuration.ConfigurationValidationException
 import deploydb.ModelLoader
-import deploydb.registry.ModelRegistry
 import deploydb.models.Webhook.Webhook
-import deploydb.models.Webhook.Deployment
+import spock.lang.*
 
-import org.slf4j.Logger
-import org.slf4j.LoggerFactory
 
 class WebhookSpec extends Specification {
     def "ensure Webhook object can be instantiated"() {

src/test/groovy/deploydb/resources/DeploymentResourceSpec.groovy

@@ -6,17 +6,17 @@ import deploydb.Status
 import deploydb.WorkFlow
 import deploydb.auth.User
 import deploydb.models.Artifact
-import io.dropwizard.testing.junit.ResourceTestRule
-import javax.ws.rs.client.Client
-import org.junit.Rule
-import spock.lang.*
 import deploydb.models.Deployment
 import deploydb.dao.DeploymentDAO
-import io.dropwizard.auth.Auth
 import io.dropwizard.auth.AuthFactory
 import io.dropwizard.auth.Authenticator
 import io.dropwizard.auth.basic.BasicAuthFactory
 import io.dropwizard.auth.basic.BasicCredentials
+import io.dropwizard.testing.junit.ResourceTestRule
+import javax.ws.rs.client.Client
+import org.junit.Rule
+import spock.lang.*
+
 
 class DeploymentResourceSpec extends Specification {
     def app = new DeployDBApp()