Introduce _spectator_stub_for_method? utility method

src/spectator/mocks/double.cr

@@ -110,6 +110,10 @@ module Spectator
       stub
     end
 
+    private def _spectator_stub_for_method?(method : Symbol) : Bool
+      @stubs.any? { |stub| stub.method == method }
+    end
+
     # Returns the double's name formatted for user output.
     private def _spectator_stubbed_name : String
       {% if anno = @type.annotation(StubbedName) %}
@@ -130,7 +134,7 @@ module Spectator
 
     private def _spectator_abstract_stub_fallback(call : MethodCall)
       Log.info do
-        break unless @stubs.any? { |stub| stub.method == call.method }
+        break unless _spectator_stub_for_method?(call.method)
 
         "Stubs are defined for #{call.method.inspect}, but none matched (no argument constraints met)."
       end

src/spectator/mocks/lazy_double.cr

@@ -32,7 +32,7 @@ module Spectator
     end
 
     private def _spectator_stub_fallback(call : MethodCall, &)
-      if @stubs.any? { |stub| stub.method == call.method }
+      if _spectator_stub_for_method?(call.method)
         Log.info { "Stubs are defined for #{call.method.inspect}, but none matched (no argument constraints met)." }
         raise UnexpectedMessage.new("#{_spectator_stubbed_name} received unexpected message #{call}")
       else

src/spectator/mocks/mock.cr

@@ -23,10 +23,14 @@ module Spectator
           @_spectator_stubs.unshift(stub)
         end
 
-        def _spectator_find_stub(call : ::Spectator::MethodCall) : ::Spectator::Stub?
+        private def _spectator_find_stub(call : ::Spectator::MethodCall) : ::Spectator::Stub?
           @_spectator_stubs.find &.===(call)
         end
 
+        private def _spectator_stub_for_method?(method : Symbol) : Bool
+          @_spectator_stubs.any? { |stub| stub.method == method }
+        end
+
         # Returns the mock's name formatted for user output.
         private def _spectator_stubbed_name : String
           \{% if anno = @type.annotation(::Spectator::StubbedName) %}

src/spectator/mocks/null_double.cr

@@ -24,7 +24,7 @@ module Spectator
     end
 
     private def _spectator_abstract_stub_fallback(call : MethodCall)
-      if @stubs.any? { |stub| stub.method == call.method }
+      if _spectator_stub_for_method?(call.method)
         Log.info { "Stubs are defined for #{call.method.inspect}, but none matched (no argument constraints met)." }
         raise UnexpectedMessage.new("#{_spectator_stubbed_name} received unexpected message #{call}")
       else
@@ -40,7 +40,7 @@ module Spectator
 
     # Default implementation that raises a `TypeCastError` since the return type isn't self.
     private def _spectator_abstract_stub_fallback(call : MethodCall, type)
-      if @stubs.any? { |stub| stub.method == call.method }
+      if _spectator_stub_for_method?(call.method)
         Log.info { "Stubs are defined for #{call.method.inspect}, but none matched (no argument constraints met)." }
         raise UnexpectedMessage.new("#{_spectator_stubbed_name} received unexpected message #{call}")
       else

src/spectator/mocks/stubbable.cr

@@ -22,6 +22,9 @@ module Spectator
     # or nil if no stubs satisfy it.
     abstract def _spectator_find_stub(call : MethodCall) : Stub?
 
+    # Utility method that looks for stubs for methods with the name specified.
+    abstract def _spectator_stub_for_method?(method : Symbol) : Bool
+
     # Defines a stub to change the behavior of a method.
     abstract def _spectator_define_stub(stub : Stub) : Nil