Add a unit test for the 'scala-jar' mapping.

ivy/src/test/resources/test-maven-repo/com/test/test-artifact/1.0.0-SNAPSHOT/test-artifact-1.0.0-SNAPSHOT.pom

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+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.test</groupId>
+    <artifactId>test-artifact</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>scala-jar</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

ivy/src/test/scala/CustomPomParserTest.scala

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+import java.io.File
+import org.apache.ivy.core.module.descriptor.{ Artifact => IvyArtifact }
+import org.apache.ivy.core.module.id.ModuleRevisionId
+import org.apache.ivy.core.resolve.ResolveOptions
+import org.specs2.mutable.Specification
+import sbt._
+import IO.withTemporaryDirectory
+
+object CustomPomParserTest extends Specification {
+
+  "CustomPomParser" should {
+    "resolve an artifact with packaging 'scala-jar' as a regular jar file." in {
+      val log = ConsoleLogger()
+      withTemporaryDirectory { cacheDir =>
+        val repoUrl = getClass.getResource("/test-maven-repo")
+        val local = MavenRepository("Test Repo", repoUrl.toExternalForm)
+        val paths = new IvyPaths(new File("."), Some(cacheDir))
+        val conf = new InlineIvyConfiguration(paths, Seq(local), Nil, Nil, false, None, Seq("sha1", "md5"), None, log)
+        val ivySbt = new IvySbt(conf)
+        val resolveOpts = new ResolveOptions().setConfs(Array("default"))
+        val mrid = ModuleRevisionId.newInstance("com.test", "test-artifact", "1.0.0-SNAPSHOT")
+
+        val resolveReport = ivySbt.withIvy(log) { ivy =>
+          ivy.resolve(mrid, resolveOpts, true)
+        }
+
+        resolveReport.hasError must beFalse
+        resolveReport.getArtifacts.size() must beEqualTo(1)
+        val artifact: IvyArtifact = resolveReport.getArtifacts.asInstanceOf[java.util.List[IvyArtifact]].get(0)
+        artifact.getModuleRevisionId must beEqualTo(mrid)
+        artifact.getExt must beEqualTo("jar")
+      }
+
+    }
+  }
+
+}