Add a test to check that Factory is binary-compatible

Author: smarter

binary-compat/new/src/main/scala/org.example/Lib.scala

@@ -1,3 +1,15 @@
 package org.example
 
-object Lib
+import scala.collection.generic._
+import scala.collection.compat._
+
+object Lib {
+  def id[A, C[X] <: Iterable[X]](x: C[A])(implicit factory: Factory[A, C[A]]) = {
+    val builder = factory.newBuilder
+    builder ++= x
+    builder.result
+  }
+
+  def test1 =
+    id(List(1, 2, 3))
+}

binary-compat/old/src/main/scala/org.example/Lib.scala

@@ -1,3 +1,14 @@
 package org.example
 
-object Lib
+import scala.collection.generic._
+
+object Lib {
+  def id[A, C[X] <: Iterable[X]](x: C[A])(implicit cbf: CanBuildFrom[C[A], A, C[A]]) = {
+    val builder = cbf()
+    builder ++= x
+    builder.result
+  }
+
+  def test1 =
+    id(List(1, 2, 3))
+}

binary-compat/test/src/test/scala/BinaryCompaTest.scala

@@ -11,6 +11,6 @@ class BinaryCompaTest {
     Config.setup("foo", Array(oldClasspath, newClasspath))
     val mima = new MiMaLib(Config.baseClassPath)
     val allProblems = mima.collectProblems(oldClasspath, newClasspath)
-    Assert.assertTrue(allProblems.isEmpty)
+    Assert.assertEquals(allProblems, Nil)
   }
-}
+}