Added option of multiple test base classes

without this change the user was forced to use a single base class for all of the generated tests. It could become problematic after some time.

With this change we provide a range of options of providing different base classes for different contracts.

fixes #16

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

@@ -112,11 +112,38 @@ class ContractVerifierExtension {
 	 */
 	boolean contractsWorkOffline
 
+	/**
+	 * A package that contains all the base clases for generated tests. If your contract resides in a location
+	 * {@code src/test/resources/contracts/com/example/v1/} and you provide the {@code packageWithBaseClasses}
+	 * value to {@code com.example.contracts.base} then we will search for a test source file that will
+	 * have the package {@code com.example.contracts.base} and name {@code ExampleV1Base}. As you can see
+	 * it will take the two last folders to and attach {@code Base} to its name.
+	 */
+	String packageWithBaseClasses
+
+	/**
+	 * A way to override any base class mappings. The keys are regular expressions on the package name
+	 * and the values FQN to a base class for that given expression.
+	 * </p>
+	 * Example of a mapping
+	 * </p>
+	 * {@code .*.com.example.v1..*} -> {@code com.example.SomeBaseClass}
+	 * </p>
+	 * When a contract's package matches the provided regular expression then extending class will be the one
+	 * provided in the map - in this case {@code com.example.SomeBaseClass}
+	 */
+	Map<String, String> baseClassMappings = [:]
+
 	void contractDependency(@DelegatesTo(Dependency) Closure closure) {
 		closure.delegate = contractDependency
 		closure.call()
 	}
 
+	void baseClassMappings(@DelegatesTo(BaseClassMapping) Closure closure) {
+		closure.delegate = new BaseClassMapping(baseClassMappings)
+		closure.call()
+	}
+
 	static class Dependency {
 		String groupId
 		String artifactId
@@ -124,4 +151,20 @@ class ContractVerifierExtension {
 		String version
 		String stringNotation
 	}
+
+	static class BaseClassMapping {
+		private final Map<String, String> delegate
+
+		BaseClassMapping(Map<String, String> delegate) {
+			this.delegate = delegate
+		}
+
+		void baseClassMapping(String packageRegex, String fqnBaseClass) {
+			this.delegate[packageRegex] = fqnBaseClass
+		}
+
+		void baseClassMapping(Map mapping) {
+			this.delegate.putAll(mapping)
+		}
+	}
 }

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

@@ -25,7 +25,9 @@ class ExtensionToProperties {
 				generatedTestSourcesDir: extension.generatedTestSourcesDir,
 				stubsOutputDir: extension.stubsOutputDir,
 				stubsSuffix: extension.stubsSuffix,
-				assertJsonSize: extension.assertJsonSize
+				assertJsonSize: extension.assertJsonSize,
+				packageWithBaseClasses: extension.packageWithBaseClasses,
+				baseClassMappings: extension.baseClassMappings
 		)
 	}
 }

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

@@ -33,8 +33,8 @@ abstract class ContractVerifierIntegrationSpec extends Specification {
 
 	public static final String SPOCK = "targetFramework = 'Spock'"
 	public static final String JUNIT = "targetFramework = 'JUnit'"
-	public static final String MVC_SPEC = "baseClassForTests = 'org.springframework.cloud.MvcSpec'"
-	public static final String MVC_TEST = "baseClassForTests = 'org.springframework.cloud.MvcTest'"
+	public static final String MVC_SPEC = "'org.springframework.cloud.MvcSpec'"
+	public static final String MVC_TEST = "'org.springframework.cloud.MvcTest'"
 	protected static final boolean WORK_OFFLINE = Boolean.parseBoolean(System.getProperty('WORK_OFFLINE', 'false'))
 
 	File testProjectDir

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

@@ -138,4 +138,25 @@ class ContractVerifierSpec extends Specification {
 				it.group == "org.assertj" && it.name == "assertj-core"
 			} != null
 	}
+
+	def "should compile"() {
+		given:
+			ContractVerifierExtension extension = new ContractVerifierExtension()
+			extension.with {
+
+				// tag::package_with_base_classes[]
+				packageWithBaseClasses = 'com.example.base'
+				// end::package_with_base_classes[]
+
+				// tag::base_class_mappings[]
+				baseClassForTests = "com.example.FooBase"
+				baseClassMappings {
+					baseClassMapping('.*/com/.*', 'com.example.ComBase')
+					baseClassMapping('.*/bar/.*':'com.example.BarBase')
+				}
+				// end::base_class_mappings[]
+			}
+		expect:
+			extension
+	}
 }

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/src/test/resources/functionalTest/scenarioProject/build.gradle

@@ -81,7 +81,12 @@ configure([project(':fraudDetectionService'), project(':loanApplicationService')
 		targetFramework = 'Spock'
 		// end::target_framework[]
 		testMode = 'MockMvc'
-		baseClassForTests = 'org.springframework.cloud.MvcSpec'
+		//baseClassForTests = 'org.springframework.cloud.MvcSpec'
+		// tag::base_class_mapping[]
+		baseClassMappings {
+			baseClassMapping('.*', 'org.springframework.cloud.MvcSpec')
+		}
+		// end::base_class_mapping[]
 		contractsDslDir = file("${project.projectDir.absolutePath}/mappings/")
 		generatedTestSourcesDir = file("${project.buildDir}/generated-test-sources/")
 		stubsOutputDir = stubsOutputDirRoot