Add failing test

shared/src/test/scala/org/scalamock/test/scalatest/AbstractOverrideMethodTest.scala

@@ -0,0 +1,18 @@
+package org.scalamock.test.scalatest
+
+import org.scalamock.scalatest.MockFactory
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class AbstractOverrideMethodTest extends AnyFlatSpec with Matchers with MockFactory {
+  class A extends B with D
+  trait B extends C { def foo(): Int = 1 }
+  trait C { def foo(): Int }
+  trait D extends C { abstract override def foo(): Int = super.foo() * 2 }
+
+  "ScalaTest suite" should "permit mocking classes build with stackable trait pattern" in {
+    val mockedClass = mock[A]
+    (mockedClass.foo _).expects().returning(42)
+    mockedClass.foo() shouldBe 42
+  }
+}