feature: fix the binary compatibility regression and added tests for beEmpty

Author: etorreborre

common/shared/src/main/scala/org/specs2/collection/IsEmpty.scala

@@ -18,18 +18,30 @@ object IsEmpty extends IsEmptyLowPriority1:
     def isEmpty(t: Array[T]): Boolean =
       t.isEmpty
 
+  given seqIsEmpty[T]: IsEmpty[Seq[T]] with
+    def isEmpty(t: Seq[T]): Boolean =
+      t.isEmpty
+
 trait IsEmptyLowPriority1 extends IsEmptyLowPriority2:
 
-  given iterableOnceIsEmpty: IsEmpty[IterableOnce[?]] with
-    def isEmpty(t: IterableOnce[?]): Boolean =
-      t.iterator.isEmpty
+  given listIsEmpty[T]: IsEmpty[List[T]] with
+    def isEmpty(t: List[T]): Boolean =
+      t.isEmpty
+
+  given optionIsEmpty[T]: IsEmpty[Option[T]] with
+    def isEmpty(t: Option[T]): Boolean =
+      !t.isDefined
 
   given eitherIsEmpty[E, T]: IsEmpty[Either[E, T]] with
     def isEmpty(t: Either[E, T]): Boolean =
       !t.toOption.isDefined
 
 trait IsEmptyLowPriority2:
 
+  given iterableOnceIsEmpty: IsEmpty[IterableOnce[?]] with
+    def isEmpty(t: IterableOnce[?]): Boolean =
+      t.iterator.isEmpty
+
   given stringIsEmpty: IsEmpty[String] with
     def isEmpty(t: String): Boolean =
       t.isEmpty

tests/jvm/src/test/scala/org/specs2/matcher/AnyMatchersSpec.scala

@@ -35,6 +35,18 @@ class AnyMatchersSpec
   ${false must beFalse}
   ${(true must beFalse).message must ===("the value is true")}
 
+  beEmpty matches empty values
+  ${"" must beEmpty}
+  ${"x" must not(beEmpty)}
+  ${None must beEmpty}
+  ${Some(1) must not(beEmpty)}
+  ${Seq() must beEmpty}
+  ${Seq(1) must not(beEmpty)}
+  ${Map() must beEmpty}
+  ${Map(1 -> 2) must not(beEmpty)}
+  ${Set() must beEmpty}
+  ${Set(1) must not(beEmpty)}
+
   beLike matches objects against a pattern
   ${List(1, 2) must beLike { case List(a, b) => ok }}
   ${List(1, 2) must beLike { case List(a, b) => (a + b) must ===(3) }}