Fix existing mock DSL macros

Initial code for mock DSL.

spec/spectator/dsl/mocks/mock_spec.cr

@@ -0,0 +1,38 @@
+require "../../../spec_helper"
+
+Spectator.describe "Mock DSL", :smoke do
+  context "with a concrete class" do
+    class ConcreteClass
+      def method1
+        "original"
+      end
+
+      def method2 : Symbol
+        :original
+      end
+    end
+
+    context "specifying methods as keyword args" do
+      mock(ConcreteClass, method1: "stubbed", method2: :stubbed)
+      subject(fake) { mock(ConcreteClass) }
+
+      it "defines a mock with methods" do
+        aggregate_failures do
+          expect(fake.method1).to eq("stubbed")
+          expect(fake.method2).to eq(:stubbed)
+        end
+      end
+
+      it "defines a subclass" do
+        expect(fake).to be_a(ConcreteClass)
+      end
+
+      it "compiles types without unions" do
+        aggregate_failures do
+          expect(fake.method1).to compile_as(String)
+          expect(fake.method2).to compile_as(Symbol)
+        end
+      end
+    end
+  end
+end