Add method to clear recorded calls

src/spectator/mocks/double.cr

@@ -121,6 +121,10 @@ module Spectator
       @calls
     end
 
+    def _spectator_clear_calls : Nil
+      @calls.clear
+    end
+
     # Returns the double's name formatted for user output.
     private def _spectator_stubbed_name : String
       {% if anno = @type.annotation(StubbedName) %}

src/spectator/mocks/mocked.cr

@@ -46,6 +46,10 @@ module Spectator
       _spectator_calls.select { |call| call.method == method }
     end
 
+    def _spectator_clear_calls : Nil
+      _spectator_calls.clear
+    end
+
     # Method called when a stub isn't found.
     #
     # The received message is captured in *call*.

src/spectator/mocks/stubbable.cr

@@ -38,6 +38,9 @@ module Spectator
     # Retrieves all previously saved calls.
     abstract def _spectator_calls
 
+    # Clears all previously saved calls.
+    abstract def _spectator_clear_calls : Nil
+
     # Method called when a stub isn't found.
     #
     # The received message is captured in *call*.
@@ -387,6 +390,8 @@ module Spectator
       extend StubbedType
 
       private class_getter _spectator_stubs : Array(::Spectator::Stub) = [] of ::Spectator::Stub
+
+      class_getter _spectator_calls : Array(::Spectator::MethodCall) = [] of ::Spectator::MethodCall
     end
   end
 end

src/spectator/mocks/stubbed_type.cr

@@ -28,8 +28,8 @@ module Spectator
       _spectator_calls << call
     end
 
-    def _spectator_calls
-      [] of MethodCall
+    def _spectator_clear_calls : Nil
+      _spectator_calls.clear
     end
 
     def _spectator_stub_fallback(call : MethodCall, &)