Add test for Type.Kind().

message/kind.go

@@ -30,16 +30,7 @@ func (k Kind) Symbol() string {
 }
 
 func (k Kind) String() string {
-	switch k {
-	case CommandKind:
-		return "command"
-	case EventKind:
-		return "event"
-	case TimeoutKind:
-		return "timeout"
-	default:
-		panic("invalid kind")
-	}
+	return MapKind(k, "command", "event", "timeout")
 }
 
 // KindFor returns the [Kind] of the message with type T.

message/type_test.go

@@ -77,6 +77,19 @@ var _ = Describe("type Type", func() {
 		})
 	})
 
+	Describe("func Kind()", func() {
+		It("returns the kind of the message", func() {
+			mt := TypeOf(CommandA1)
+			Expect(mt.Kind()).To(Equal(CommandKind))
+		})
+
+		It("panics if the type is the zero-value", func() {
+			Expect(func() {
+				Type{}.Kind()
+			}).To(Panic())
+		})
+	})
+
 	Describe("func ReflectType()", func() {
 		It("returns the reflect.Type for the message", func() {
 			mt := TypeOf(CommandA1)