diff --git a/src/main/groovy/nebula/test/dependencies/Coordinate.groovy b/src/main/groovy/nebula/test/dependencies/Coordinate.groovy
index 62fd231..d4d8596 100644
--- a/src/main/groovy/nebula/test/dependencies/Coordinate.groovy
+++ b/src/main/groovy/nebula/test/dependencies/Coordinate.groovy
@@ -22,9 +22,22 @@ class Coordinate {
     String group
     String artifact
     String version
+    String classifier
+    String extension
 
     @Override
     String toString() {
-        "${group}:${artifact}:${version}"
+        def sb = "${group}:${artifact}:${version}"
+        if (classifier) sb <<= ":${classifier}"
+        if (extension) sb <<= "@${extension}"
+        return sb
+    }
+
+    public static Coordinate of(String s) {
+        def (substr, extension) = s.trim().tokenize("@")
+
+        def (group, artifact, version, classifier) = substr.tokenize(':')
+        return new Coordinate(
+                group: group, artifact: artifact, version: version, classifier: classifier, extension: extension)
     }
 }
diff --git a/src/main/groovy/nebula/test/dependencies/DependencyGraph.groovy b/src/main/groovy/nebula/test/dependencies/DependencyGraph.groovy
index 8ae0d06..b3dbfe9 100644
--- a/src/main/groovy/nebula/test/dependencies/DependencyGraph.groovy
+++ b/src/main/groovy/nebula/test/dependencies/DependencyGraph.groovy
@@ -31,11 +31,10 @@ class DependencyGraph {
     }
     
     private DependencyGraphNode parseNode(String s) {
-        // Don't use tokenize, it'll make each character a possible delimeter, e.g. \t\n would tokenize on both
+        // Don't use tokenize, it'll make each character a possible delimiter, e.g. \t\n would tokenize on both
         // \t OR \n, not the combination of \t\n.
         def parts = s.split('->')
-        def (group, artifact, version) = parts[0].trim().tokenize(':')
-        def coordinate = new Coordinate(group: group, artifact: artifact, version: version)
+        def coordinate = Coordinate.of(parts[0])
         def dependencies = (parts.size() > 1) ? parseDependencies(parts[1]) : []
 
         new DependencyGraphNode(coordinate: coordinate, dependencies: dependencies)
@@ -44,8 +43,7 @@ class DependencyGraph {
     private List<Coordinate> parseDependencies(String s) {
         List<Coordinate> dependencies = []
         s.tokenize('|').each { String dependency ->
-            def (group, artifact, version) = dependency.trim().tokenize(':')
-            dependencies << new Coordinate(group: group, artifact: artifact, version: version)
+            dependencies << Coordinate.of(dependency)
         }
 
         dependencies
diff --git a/src/main/groovy/nebula/test/dependencies/DependencyGraphBuilder.groovy b/src/main/groovy/nebula/test/dependencies/DependencyGraphBuilder.groovy
index 582b3ca..b57977e 100644
--- a/src/main/groovy/nebula/test/dependencies/DependencyGraphBuilder.groovy
+++ b/src/main/groovy/nebula/test/dependencies/DependencyGraphBuilder.groovy
@@ -3,20 +3,30 @@ package nebula.test.dependencies
 class DependencyGraphBuilder {
     Map<String, DependencyGraphNode> modules = [:]
 
-    DependencyGraphBuilder addModule(String coordinate) {
-        def (group, artifact, version) = coordinate.trim().tokenize(':')
-        addModule(group, artifact, version)
+    DependencyGraphBuilder addModule(String coordinateString) {
+        Coordinate coordinate = Coordinate.of(coordinateString)
+        modules[coordinate.toString()] = new DependencyGraphNode(coordinate: coordinate)
+
+        this
     }
 
     DependencyGraphBuilder addModule(String group, String artifact, String version) {
-        String key = "${group}:${artifact}:${version}".toString()
-        modules[key] = new DependencyGraphNode(coordinate: new Coordinate(group: group, artifact: artifact, version: version))
+        Coordinate coordinate = new Coordinate(group: group, artifact: artifact, version: version);
+        modules[coordinate.toString()] = new DependencyGraphNode(coordinate: coordinate)
+
+        this
+    }
+
+    DependencyGraphBuilder addModule(String group, String artifact, String version, String classifier, String extension) {
+        Coordinate coordinate = new Coordinate(
+                group: group, artifact: artifact, version: version, classifier: classifier, extension: extension);
+        modules[coordinate.toString()] = new DependencyGraphNode(coordinate: coordinate)
 
         this
     }
 
     DependencyGraphBuilder addModule(DependencyGraphNode node) {
-        modules[node.toString()] = node
+        modules[node.coordinate.toString()] = node
 
         node.dependencies.each { Coordinate dep ->
             if (!modules.containsKey(dep.toString())) {
diff --git a/src/main/groovy/nebula/test/dependencies/DependencyGraphNode.groovy b/src/main/groovy/nebula/test/dependencies/DependencyGraphNode.groovy
index 1dcbd9d..706b8a2 100644
--- a/src/main/groovy/nebula/test/dependencies/DependencyGraphNode.groovy
+++ b/src/main/groovy/nebula/test/dependencies/DependencyGraphNode.groovy
@@ -24,6 +24,6 @@ class DependencyGraphNode {
 
     @Override
     String toString() {
-        "${group}:${artifact}:${version}"
+        coordinate.toString()
     }
 }
diff --git a/src/main/groovy/nebula/test/dependencies/GradleDependencyGenerator.groovy b/src/main/groovy/nebula/test/dependencies/GradleDependencyGenerator.groovy
index c46092b..e01ae88 100644
--- a/src/main/groovy/nebula/test/dependencies/GradleDependencyGenerator.groovy
+++ b/src/main/groovy/nebula/test/dependencies/GradleDependencyGenerator.groovy
@@ -24,6 +24,9 @@ class GradleDependencyGenerator {
             apply plugin: 'ivy-publish'
             apply plugin: 'java'
 
+            task sourceJar(type: Jar) {
+            }
+
             publishing {
                 repositories {
                     maven {
@@ -43,11 +46,25 @@ class GradleDependencyGenerator {
                         artifactId artifactName
 
                         from components.java
+
+                        if (classifierName != null || extensionName != 'jar') {
+                            artifact(sourceJar) {
+                                classifier classifierName
+                                extension extensionName
+                            }
+                        }
                     }
                     ivy(IvyPublication) {
                         module artifactName
 
                         from components.java
+
+                        if (classifierName != null || extensionName != 'jar') {
+                            artifact(sourceJar) {
+                                classifier classifierName
+                                extension extensionName
+                            }
+                        }
                     }
                 }
             }
@@ -156,6 +173,8 @@ class GradleDependencyGenerator {
             version = '${node.version}'
             ext {
                 artifactName = '${node.artifact}'
+                extensionName = '${node.extension? node.extension: 'jar'}'
+                classifierName = ${node.classifier? "'${node.classifier}'": null}
             }
         """.stripIndent() + block.toString()
     }
diff --git a/src/main/groovy/nebula/test/dependencies/ModuleBuilder.groovy b/src/main/groovy/nebula/test/dependencies/ModuleBuilder.groovy
index a146aa6..459e6f9 100644
--- a/src/main/groovy/nebula/test/dependencies/ModuleBuilder.groovy
+++ b/src/main/groovy/nebula/test/dependencies/ModuleBuilder.groovy
@@ -5,23 +5,34 @@ class ModuleBuilder {
     List<Coordinate> dependencies = []
 
     ModuleBuilder(String coordinate) {
-        def (group, artifact, version) = coordinate.tokenize(':')
-        module = new Coordinate(group: group, artifact: artifact, version: version)
+        module = Coordinate.of(coordinate)
     }
 
     ModuleBuilder(String group, String artifact, String version) {
         module = new Coordinate(group: group, artifact: artifact, version: version)
     }
 
+    ModuleBuilder(String group, String artifact, String version, String classifier, String extension) {
+        module = new Coordinate(
+                group: group, artifact: artifact, version: version, classifier: classifier, extension: extension)
+    }
+
     ModuleBuilder addDependency(String dependency) {
-        def (group, artifact, version) = dependency.tokenize(':')
-        dependencies << new Coordinate(group: group, artifact: artifact, version: version)
+        dependencies << Coordinate.of(dependency)
 
         this
     }
 
     ModuleBuilder addDependency(String group, String artifact, String version) {
-        dependencies << new Coordinate(group: group, artifact: artifact, version: version)
+        dependencies <<  new Coordinate(
+                group: group, artifact: artifact, version: version)
+
+        this
+    }
+
+    ModuleBuilder addDependency(String group, String artifact, String version, String classifier, String extension) {
+        dependencies <<  new Coordinate(
+                group: group, artifact: artifact, version: version, classifier: classifier, extension: extension)
 
         this
     }
diff --git a/src/test/groovy/nebula/test/dependencies/DependencyGraphBuilderSpec.groovy b/src/test/groovy/nebula/test/dependencies/DependencyGraphBuilderSpec.groovy
index 42dbf50..fdcf990 100644
--- a/src/test/groovy/nebula/test/dependencies/DependencyGraphBuilderSpec.groovy
+++ b/src/test/groovy/nebula/test/dependencies/DependencyGraphBuilderSpec.groovy
@@ -16,6 +16,59 @@ class DependencyGraphBuilderSpec extends Specification {
         foo.group == 'test.nebula'
         foo.artifact == 'foo'
         foo.version == '1.0.0'
+        foo.classifier == null
+        foo.extension == null
+    }
+
+    def 'add one dependency with classifier'() {
+        def builder = new DependencyGraphBuilder()
+        builder.addModule('test.nebula:foo:1.0.0:bar')
+
+        when:
+        DependencyGraph graph = builder.build()
+
+        then:
+        graph.nodes.size() == 1
+        Coordinate foo = graph.nodes.find().coordinate
+        foo.group == 'test.nebula'
+        foo.artifact == 'foo'
+        foo.version == '1.0.0'
+        foo.classifier == 'bar'
+        foo.extension == null
+    }
+
+    def 'add one dependency with extension'() {
+        def builder = new DependencyGraphBuilder()
+        builder.addModule('test.nebula:foo:1.0.0@zip')
+
+        when:
+        DependencyGraph graph = builder.build()
+
+        then:
+        graph.nodes.size() == 1
+        Coordinate foo = graph.nodes.find().coordinate
+        foo.group == 'test.nebula'
+        foo.artifact == 'foo'
+        foo.version == '1.0.0'
+        foo.classifier == null
+        foo.extension == 'zip'
+    }
+
+    def 'add one dependency with classifier, extension'() {
+        def builder = new DependencyGraphBuilder()
+        builder.addModule('test.nebula:foo:1.0.0:bar@zip')
+
+        when:
+        DependencyGraph graph = builder.build()
+
+        then:
+        graph.nodes.size() == 1
+        Coordinate foo = graph.nodes.find().coordinate
+        foo.group == 'test.nebula'
+        foo.artifact == 'foo'
+        foo.version == '1.0.0'
+        foo.classifier == 'bar'
+        foo.extension == 'zip'
     }
 
     def 'add one dependency with group, artifact, version syntax'() {
@@ -31,6 +84,25 @@ class DependencyGraphBuilderSpec extends Specification {
         foo.group == 'test.nebula'
         foo.artifact == 'foo'
         foo.version == '1.0.0'
+        foo.classifier == null
+        foo.extension == null
+    }
+
+    def 'add one dependency with group, artifact, version, classifier, extension syntax'() {
+        def builder = new DependencyGraphBuilder()
+        builder.addModule('test.nebula', 'foo', '1.0.0', 'bar', 'zip')
+
+        when:
+        DependencyGraph graph = builder.build()
+
+        then:
+        graph.nodes.size() == 1
+        Coordinate foo = graph.nodes.find().coordinate
+        foo.group == 'test.nebula'
+        foo.artifact == 'foo'
+        foo.version == '1.0.0'
+        foo.classifier == 'bar'
+        foo.extension == 'zip'
     }
 
     def 'add multiple dependencies'() {
@@ -47,10 +119,14 @@ class DependencyGraphBuilderSpec extends Specification {
         foo.group == 'test.nebula'
         foo.artifact == 'foo'
         foo.version == '1.0.0'
+        foo.classifier == null
+        foo.extension == null
         Coordinate bar = graph.nodes.find { it.coordinate.artifact == 'bar' }.coordinate
         bar.group == 'a.nebula'
         bar.artifact == 'bar'
         bar.version == '2.0.0'
+        bar.classifier == null
+        bar.extension == null
     }
 
     def 'add module with dependencies'() {
@@ -81,6 +157,8 @@ class DependencyGraphBuilderSpec extends Specification {
         dep.group == 'test.nebula'
         dep.artifact == 'baz'
         dep.version == '23.1.3'
+        dep.classifier == null
+        dep.extension == null
     }
 
     def 'add module with dependencies, verify modules are not replaced with placeholder'() {
@@ -100,5 +178,7 @@ class DependencyGraphBuilderSpec extends Specification {
         dep.group == 'test.nebula'
         dep.artifact == 'baz'
         dep.version == '23.1.3'
+        dep.classifier == null
+        dep.extension == null
     }
 }
diff --git a/src/test/groovy/nebula/test/dependencies/DependencyGraphSpec.groovy b/src/test/groovy/nebula/test/dependencies/DependencyGraphSpec.groovy
index 4a411c9..53b9929 100644
--- a/src/test/groovy/nebula/test/dependencies/DependencyGraphSpec.groovy
+++ b/src/test/groovy/nebula/test/dependencies/DependencyGraphSpec.groovy
@@ -28,13 +28,15 @@ class DependencyGraphSpec extends Specification {
         node.group == 'test'
         node.artifact == 'foo'
         node.version == '1.0.0'
+        node.classifier == null
+        node.extension == null
         node.dependencies.size() == 0
         node.toString() == 'test:foo:1.0.0'
     }
 
     def 'node with dependencies'() {
         when:
-        def graph = new DependencyGraph(['test:foo:1.0.0 -> test:bar:1.+'])
+        def graph = new DependencyGraph(['test:foo:1.0.0:baz@zip -> test:bar:1.+:bat@jar'])
 
         then:
         graph.nodes.size() == 1
@@ -42,11 +44,15 @@ class DependencyGraphSpec extends Specification {
         node.group == 'test'
         node.artifact == 'foo'
         node.version == '1.0.0'
+        node.classifier == 'baz'
+        node.extension == 'zip'
         node.dependencies.size() == 1 
         Coordinate dependency = node.dependencies[0]
         dependency.group == 'test'
         dependency.artifact == 'bar'
-        dependency.version == '1.+'   
+        dependency.version == '1.+'
+        dependency.classifier == 'bat'
+        dependency.extension == 'jar'
     }
 
     def 'node with multiple dependencies'() {
diff --git a/src/test/groovy/nebula/test/dependencies/GradleDependencyGeneratorSpec.groovy b/src/test/groovy/nebula/test/dependencies/GradleDependencyGeneratorSpec.groovy
index f27e7e5..2c6362a 100644
--- a/src/test/groovy/nebula/test/dependencies/GradleDependencyGeneratorSpec.groovy
+++ b/src/test/groovy/nebula/test/dependencies/GradleDependencyGeneratorSpec.groovy
@@ -33,6 +33,45 @@ class GradleDependencyGeneratorSpec extends Specification {
         new File(mavenRepo, 'test/maven/foo/1.0.0/foo-1.0.0.jar').exists()
     }
 
+    def 'generate a maven repo with a classifier'() {
+        def directory = 'build/testdependencies/testmavenrepo'
+        def graph = ['test.maven:foo:1.0.0:bat']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestMavenRepo()
+
+        then:
+        def mavenRepo = new File(directory + '/mavenrepo')
+        new File(mavenRepo, 'test/maven/foo/1.0.0/foo-1.0.0-bat.jar').exists()
+    }
+
+    def 'generate a maven repo with a extension'() {
+        def directory = 'build/testdependencies/testmavenrepo'
+        def graph = ['test.maven:foo:1.0.0@zip']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestMavenRepo()
+
+        then:
+        def mavenRepo = new File(directory + '/mavenrepo')
+        new File(mavenRepo, 'test/maven/foo/1.0.0/foo-1.0.0.zip').exists()
+    }
+
+    def 'generate a maven repo with a classifier and extension'() {
+        def directory = 'build/testdependencies/testmavenrepo'
+        def graph = ['test.maven:foo:1.0.0:bar@zip']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestMavenRepo()
+
+        then:
+        def mavenRepo = new File(directory + '/mavenrepo')
+        new File(mavenRepo, 'test/maven/foo/1.0.0/foo-1.0.0-bar.zip').exists()
+    }
+
     def 'generate a maven repo with a SNAPSHOT'() {
         def directory = 'build/testdependencies/testmavenreposnapshot'
         def graph = ['test.maven:foo:1.0.1-SNAPSHOT']
@@ -62,6 +101,19 @@ class GradleDependencyGeneratorSpec extends Specification {
         new File(ivyRepo, 'test/ivy/foo/1.0.0/foo-1.0.0.jar').exists()
     }
 
+    def 'generate an ivy repo with classifier and extension'() {
+        def directory = 'build/testdependencies/testivyrepo'
+        def graph = ['test.ivy:foo:1.0.0:baz@zip']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestIvyRepo()
+
+        then:
+        def ivyRepo = new File(directory + '/ivyrepo')
+        new File(ivyRepo, 'test/ivy/foo/1.0.0/foo-1.0.0-baz.zip').exists()
+    }
+
     def 'check ivy status'() {
         def directory = 'build/testdependencies/ivyxml'
         def graph = ['test.ivy:foo:1.0.0']
@@ -103,6 +155,22 @@ class GradleDependencyGeneratorSpec extends Specification {
         new File(repo, 'ivyrepo/test/ivy/foo/1.0.0/foo-1.0.0-ivy.xml').text.contains '<dependency org="test.ivy" name="bar" rev="1.1.0" conf="compile-&gt;default"/>'
     }
 
+    def 'check ivy xml with dependency with classifier and extension'() {
+        def directory = 'build/testdependencies/ivyxml'
+        def graph = ['test.ivy:foo:1.0.0 -> test.ivy:bar:1.1.0:baz@zip']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestIvyRepo()
+
+        then:
+        def repo = new File(directory)
+        new File(repo, 'test.ivy.foo_1_0_0/build.gradle').text.contains 'compile \'test.ivy:bar:1.1.0:baz@zip\''
+        def xml = new File(repo, 'ivyrepo/test/ivy/foo/1.0.0/foo-1.0.0-ivy.xml').text
+        xml.contains '<dependency org="test.ivy" name="bar" rev="1.1.0" conf="compile-&gt;default" transitive="false">'
+        xml.contains '<artifact name="bar" type="zip" ext="zip" m:classifier="baz"/>'
+    }
+
     def 'check maven pom'() {
         def directory = 'build/testdependencies/mavenpom'
         def graph = ['test.maven:foo:1.0.0 -> test.maven:bar:1.+']
@@ -121,6 +189,26 @@ class GradleDependencyGeneratorSpec extends Specification {
         pom.contains '<scope>compile</scope>'
     }
 
+    def 'check maven pom with dependency with classifier and extension'() {
+        def directory = 'build/testdependencies/mavenpom'
+        def graph = ['test.maven:foo:1.0.0 -> test.maven:bar:1.+:baz@zip']
+        def generator = new GradleDependencyGenerator(new DependencyGraph(graph), directory)
+
+        when:
+        generator.generateTestMavenRepo()
+
+        then:
+        def repo = new File(directory)
+        new File(repo, 'test.maven.foo_1_0_0/build.gradle').text.contains 'compile \'test.maven:bar:1.+:baz@zip\''
+        def pom = new File(repo, 'mavenrepo/test/maven/foo/1.0.0/foo-1.0.0.pom').text
+        pom.contains '<groupId>test.maven</groupId>'
+        pom.contains '<artifactId>bar</artifactId>'
+        pom.contains '<version>1.+</version>'
+        pom.contains '<scope>compile</scope>'
+        pom.contains '<classifier>baz</classifier>'
+        pom.contains '<type>zip</type>'
+    }
+
     def 'multiple libraries with dependencies'() {
         def graph = ['integration.test:foo:1.0.0', 
                 'integration.test:foo:1.0.1',
diff --git a/src/test/groovy/nebula/test/dependencies/ModuleBuilderSpec.groovy b/src/test/groovy/nebula/test/dependencies/ModuleBuilderSpec.groovy
index 54250b7..0f41508 100644
--- a/src/test/groovy/nebula/test/dependencies/ModuleBuilderSpec.groovy
+++ b/src/test/groovy/nebula/test/dependencies/ModuleBuilderSpec.groovy
@@ -13,6 +13,54 @@ class ModuleBuilderSpec extends Specification {
         module.group == 'test.modulebuilder'
         module.artifact == 'foo'
         module.version == '1.0.0'
+        module.classifier == null
+        module.extension == null
+        module.dependencies.size() == 0
+    }
+
+    def 'build module with classifier with no dependencies'() {
+        def builder = new ModuleBuilder('test.modulebuilder:foo:1.0.0:bar')
+
+        when:
+        DependencyGraphNode module = builder.build()
+
+        then:
+        module.group == 'test.modulebuilder'
+        module.artifact == 'foo'
+        module.version == '1.0.0'
+        module.classifier == 'bar'
+        module.extension == null
+        module.dependencies.size() == 0
+    }
+
+
+    def 'build module with extension with no dependencies'() {
+        def builder = new ModuleBuilder('test.modulebuilder:foo:1.0.0@zip')
+
+        when:
+        DependencyGraphNode module = builder.build()
+
+        then:
+        module.group == 'test.modulebuilder'
+        module.artifact == 'foo'
+        module.version == '1.0.0'
+        module.classifier == null
+        module.extension == 'zip'
+        module.dependencies.size() == 0
+    }
+
+    def 'build module with classifier and extension with no dependencies'() {
+        def builder = new ModuleBuilder('test.modulebuilder:foo:1.0.0:bar@zip')
+
+        when:
+        DependencyGraphNode module = builder.build()
+
+        then:
+        module.group == 'test.modulebuilder'
+        module.artifact == 'foo'
+        module.version == '1.0.0'
+        module.classifier == 'bar'
+        module.extension == 'zip'
         module.dependencies.size() == 0
     }
 
@@ -26,6 +74,23 @@ class ModuleBuilderSpec extends Specification {
         module.group == 'test.modulebuilder'
         module.artifact == 'foo'
         module.version == '1.0.0'
+        module.classifier == null
+        module.extension == null
+        module.dependencies.size() == 0
+    }
+    
+    def 'build module with no dependencies separate group, artifact, version, classifer, extension'() {
+        def builder = new ModuleBuilder('test.modulebuilder', 'foo', '1.0.0', 'bar', 'zip')
+
+        when:
+        DependencyGraphNode module = builder.build()
+
+        then:
+        module.group == 'test.modulebuilder'
+        module.artifact == 'foo'
+        module.version == '1.0.0'
+        module.classifier == 'bar'
+        module.extension == 'zip'
         module.dependencies.size() == 0
     }
 
@@ -42,12 +107,31 @@ class ModuleBuilderSpec extends Specification {
         dep.group == 'test.dependency'
         dep.artifact == 'baz'
         dep.version == '2.0.1'
+        dep.classifier == null
+        dep.extension == null
+    }
+
+    def 'add dependency with classifier, extension'() {
+        def builder = new ModuleBuilder('test.modulebuilder', 'bar', '1.0.0')
+        builder.addDependency('test.dependency', 'baz', '2.0.1', 'bar', 'zip')
+
+        when:
+        DependencyGraphNode module = builder.build()
+
+        then:
+        module.dependencies.size() == 1
+        def dep = module.dependencies.find()
+        dep.group == 'test.dependency'
+        dep.artifact == 'baz'
+        dep.version == '2.0.1'
+        dep.classifier == 'bar'
+        dep.extension == 'zip'
     }
 
     def 'add dependencies'() {
         def builder = new ModuleBuilder('test.modulebuilder', 'bar', '1.0.0')
         builder.addDependency('test.dependency', 'baz', '2.0.1')
-                .addDependency('test.dependency:qux:42.13.0')
+                .addDependency('test.dependency:qux:42.13.0:bar@zip')
 
         when:
         DependencyGraphNode module = builder.build()
@@ -58,9 +142,13 @@ class ModuleBuilderSpec extends Specification {
         baz.group == 'test.dependency'
         baz.artifact == 'baz'
         baz.version == '2.0.1'
+        baz.classifier == null
+        baz.extension == null
         def qux = module.dependencies.find { it.artifact == 'qux' }
         qux.group == 'test.dependency'
         qux.artifact == 'qux'
         qux.version == '42.13.0'
+        qux.classifier == 'bar'
+        qux.extension == 'zip'
     }
 }