diff --git a/src/spectator/dsl/matchers.cr b/src/spectator/dsl/matchers.cr
index 0e779c3..572aea6 100644
--- a/src/spectator/dsl/matchers.cr
+++ b/src/spectator/dsl/matchers.cr
@@ -703,33 +703,33 @@ module Spectator
     # # Is equivalent to:
     # expect("foobar".has_back_references?).to_not be_true
     # ```
-    macro method_missing(call)
-      {% if call.name.starts_with?("be_") %}
-        # Remove `be_` prefix.
-        {% method_name = call.name[3..-1] %}
-        {% matcher = "PredicateMatcher" %}
-      {% elsif call.name.starts_with?("have_") %}
-        # Remove `have_` prefix.
-        {% method_name = call.name[5..-1] %}
-        {% matcher = "HavePredicateMatcher" %}
-      {% else %}
-        {% raise "Undefined local variable or method '#{call}'" %}
-      {% end %}
-
-      descriptor = { {{method_name}}: Tuple.new({{call.args.splat}}) }
-      label = String::Builder.new({{method_name.stringify}})
-      {% unless call.args.empty? %}
-        label << '('
-        {% for arg, index in call.args %}
-          label << {{arg}}
-          {% if index < call.args.size - 1 %}
-            label << ", "
-          {% end %}
-        {% end %}
-        label << ')'
-      {% end %}
-      test_value = ::Spectator::TestValue.new(descriptor, label.to_s)
-      ::Spectator::Matchers::{{matcher.id}}.new(test_value)
-    end
+    # macro method_missing(call)
+    #   {% if call.name.starts_with?("be_") %}
+    #     # Remove `be_` prefix.
+    #     {% method_name = call.name[3..-1] %}
+    #     {% matcher = "PredicateMatcher" %}
+    #   {% elsif call.name.starts_with?("have_") %}
+    #     # Remove `have_` prefix.
+    #     {% method_name = call.name[5..-1] %}
+    #     {% matcher = "HavePredicateMatcher" %}
+    #   {% else %}
+    #     {% raise "Undefined local variable or method '#{call}'" %}
+    #   {% end %}
+    #
+    #   descriptor = { {{method_name}}: Tuple.new({{call.args.splat}}) }
+    #   label = String::Builder.new({{method_name.stringify}})
+    #   {% unless call.args.empty? %}
+    #     label << '('
+    #     {% for arg, index in call.args %}
+    #       label << {{arg}}
+    #       {% if index < call.args.size - 1 %}
+    #         label << ", "
+    #       {% end %}
+    #     {% end %}
+    #     label << ')'
+    #   {% end %}
+    #   test_value = ::Spectator::TestValue.new(descriptor, label.to_s)
+    #   ::Spectator::Matchers::{{matcher.id}}.new(test_value)
+    # end
   end
 end
diff --git a/src/spectator/dsl/mocks.cr b/src/spectator/dsl/mocks.cr
index afcb681..be05616 100644
--- a/src/spectator/dsl/mocks.cr
+++ b/src/spectator/dsl/mocks.cr
@@ -1,13 +1,11 @@
-require "../double"
-require "../generic_method_stub"
-require "../open_mock"
+require "../mocks"
 
 module Spectator::DSL
   macro double(name, &block)
     {% if block.is_a?(Nop) %}
       Double{{name.id}}.new(self)
     {% else %}
-      class Double{{name.id}} < ::Spectator::Double
+      class Double{{name.id}} < ::Spectator::Mocks::Double
         def initialize(@spectator_test : {{@type.id}})
           super({{name.id.symbolize}})
         end
@@ -19,12 +17,12 @@ module Spectator::DSL
     {% end %}
   end
 
-  def allow(double : ::Spectator::Double)
-    OpenMock.new(double)
+  def allow(double : ::Spectator::Mocks::Double)
+    Mocks::OpenMock.new(double)
   end
 
   macro receive(method_name, _source_file = __FILE__, _source_line = __LINE__)
     %source = ::Spectator::Source.new({{_source_file}}, {{_source_line}})
-    ::Spectator::GenericMethodStub(Nil).new({{method_name.symbolize}}, %source, ->{ nil })
+    ::Spectator::Mocks::GenericMethodStub(Nil).new({{method_name.symbolize}}, %source, ->{ nil })
   end
 end
diff --git a/src/spectator/includes.cr b/src/spectator/includes.cr
index d103cfa..4425f99 100644
--- a/src/spectator/includes.cr
+++ b/src/spectator/includes.cr
@@ -29,8 +29,7 @@ require "./example_group"
 require "./nested_example_group"
 require "./root_example_group"
 
-require "./mock"
-require "./double"
+require "./mocks"
 
 require "./config"
 require "./config_builder"
diff --git a/src/spectator/matchers/receive_matcher.cr b/src/spectator/matchers/receive_matcher.cr
index 89b627c..7bb8756 100644
--- a/src/spectator/matchers/receive_matcher.cr
+++ b/src/spectator/matchers/receive_matcher.cr
@@ -1,4 +1,4 @@
-require "../double"
+require "../mocks/double"
 require "./standard_matcher"
 
 module Spectator::Matchers
@@ -11,7 +11,7 @@ module Spectator::Matchers
     end
 
     def match?(actual : TestExpression(T)) : Bool forall T
-      double = actual.value.as(Double)
+      double = actual.value.as(Mocks::Double)
       calls = double.spectator_stub_calls(@expected.value)
       !calls.empty?
     end
diff --git a/src/spectator/mocks.cr b/src/spectator/mocks.cr
new file mode 100644
index 0000000..f50bf9e
--- /dev/null
+++ b/src/spectator/mocks.cr
@@ -0,0 +1,7 @@
+require "./mocks/*"
+
+module Spectator
+  # Functionality for mocking existing types.
+  module Mocks
+  end
+end
diff --git a/src/spectator/double.cr b/src/spectator/mocks/double.cr
similarity index 83%
rename from src/spectator/double.cr
rename to src/spectator/mocks/double.cr
index 424f850..83c3679 100644
--- a/src/spectator/double.cr
+++ b/src/spectator/mocks/double.cr
@@ -1,7 +1,7 @@
 require "./generic_method_call"
 require "./generic_method_stub"
 
-module Spectator
+module Spectator::Mocks
   abstract class Double
     @spectator_stubs = Deque(MethodStub).new
     @spectator_stub_calls = Deque(MethodCall).new
@@ -37,20 +37,20 @@ module Spectator
       %}
 
       def {{name}}({{params.splat}}){% if definition.is_a?(TypeDeclaration) %} : {{definition.type}}{% end %}
-        %call = ::Spectator::GenericMethodCall.create({{name.symbolize}}{% unless args.empty? %}, {{args.splat}}{% end %})
+        %call = ::Spectator::Mocks::GenericMethodCall.create({{name.symbolize}}{% unless args.empty? %}, {{args.splat}}{% end %})
         @spectator_stub_calls << %call
         if (%stub = @spectator_stubs.find(&.callable?(%call)))
-          %stub.as(::Spectator::GenericMethodStub(typeof(%method({{args.splat}})))).call(%call)
+          %stub.as(::Spectator::Mocks::GenericMethodStub(typeof(%method({{args.splat}})))).call(%call)
         else
           %method({{args.splat}})
         end
       end
 
       def {{name}}({{params.splat}}){% if definition.is_a?(TypeDeclaration) %} : {{definition.type}}{% end %}
-        %call = ::Spectator::GenericMethodCall.create({{name.symbolize}}{% unless args.empty? %}, {{args.splat}}{% end %})
+        %call = ::Spectator::Mocks::GenericMethodCall.create({{name.symbolize}}{% unless args.empty? %}, {{args.splat}}{% end %})
         @spectator_stub_calls << %call
         if (%stub = @spectator_stubs.find(&.callable?(%call)))
-          %stub.as(::Spectator::GenericMethodStub(typeof(%method({{args.splat}}) { |*%yield_args| yield *%yield_args }))).call(%call)
+          %stub.as(::Spectator::Mocks::GenericMethodStub(typeof(%method({{args.splat}}) { |*%yield_args| yield *%yield_args }))).call(%call)
         else
           %method({{args.splat}}) do |*%yield_args|
             yield *%yield_args
diff --git a/src/spectator/generic_method_call.cr b/src/spectator/mocks/generic_method_call.cr
similarity index 95%
rename from src/spectator/generic_method_call.cr
rename to src/spectator/mocks/generic_method_call.cr
index 75050ce..f413537 100644
--- a/src/spectator/generic_method_call.cr
+++ b/src/spectator/mocks/generic_method_call.cr
@@ -1,6 +1,6 @@
 require "./method_call"
 
-module Spectator
+module Spectator::Mocks
   class GenericMethodCall(T, NT) < MethodCall
     getter args : T
 
diff --git a/src/spectator/generic_method_stub.cr b/src/spectator/mocks/generic_method_stub.cr
similarity index 91%
rename from src/spectator/generic_method_stub.cr
rename to src/spectator/mocks/generic_method_stub.cr
index 0c752ab..c3349ae 100644
--- a/src/spectator/generic_method_stub.cr
+++ b/src/spectator/mocks/generic_method_stub.cr
@@ -1,8 +1,8 @@
+require "../source"
 require "./method_call"
 require "./method_stub"
-require "./source"
 
-module Spectator
+module Spectator::Mocks
   class GenericMethodStub(ReturnType) < MethodStub
     def initialize(name : Symbol, source : Source, @proc : -> ReturnType)
       super(name, source)
diff --git a/src/spectator/method_call.cr b/src/spectator/mocks/method_call.cr
similarity index 81%
rename from src/spectator/method_call.cr
rename to src/spectator/mocks/method_call.cr
index 719b608..7c85862 100644
--- a/src/spectator/method_call.cr
+++ b/src/spectator/mocks/method_call.cr
@@ -1,4 +1,4 @@
-module Spectator
+module Spectator::Mocks
   abstract class MethodCall
     getter name : Symbol
 
diff --git a/src/spectator/method_stub.cr b/src/spectator/mocks/method_stub.cr
similarity index 80%
rename from src/spectator/method_stub.cr
rename to src/spectator/mocks/method_stub.cr
index 856ed1e..3bc3790 100644
--- a/src/spectator/method_stub.cr
+++ b/src/spectator/mocks/method_stub.cr
@@ -1,6 +1,6 @@
-require "./source"
+require "../source"
 
-module Spectator
+module Spectator::Mocks
   abstract class MethodStub
     def initialize(@name : Symbol, @source : Source)
     end
diff --git a/src/spectator/mock.cr b/src/spectator/mocks/mock.cr
similarity index 98%
rename from src/spectator/mock.cr
rename to src/spectator/mocks/mock.cr
index 76df55b..e46b6a9 100644
--- a/src/spectator/mock.cr
+++ b/src/spectator/mocks/mock.cr
@@ -1,4 +1,4 @@
-module Spectator
+module Spectator::Mocks
   module Mock
     macro included
       {% for meth in @type.methods %}
diff --git a/src/spectator/open_mock.cr b/src/spectator/mocks/open_mock.cr
similarity index 86%
rename from src/spectator/open_mock.cr
rename to src/spectator/mocks/open_mock.cr
index 64068ce..b4549f9 100644
--- a/src/spectator/open_mock.cr
+++ b/src/spectator/mocks/open_mock.cr
@@ -1,4 +1,4 @@
-module Spectator
+module Spectator::Mocks
   struct OpenMock
     def initialize(@mock : Double)
     end