Fix typo in check_missing_methods! (#364)

Fix typo in `check_missing_methods!`

lib/statesman/adapters/active_record_queries.rb

@@ -3,7 +3,7 @@ module Adapters
     module ActiveRecordQueries
       def self.check_missing_methods!(base)
         missing_methods = %i[transition_class initial_state].
-          reject { |_method| base.respond_to?(:method) }
+          reject { |m| base.respond_to?(m) }
         return if missing_methods.none?
 
         raise NotImplementedError,

spec/statesman/adapters/active_record_queries_spec.rb

@@ -212,4 +212,32 @@ class UnknownModelTransition < OtherActiveRecordModelTransition; end
       end
     end
   end
+
+  describe "check_missing_methods!" do
+    subject(:check_missing_methods!) { described_class.check_missing_methods!(base) }
+
+    context "when base has no missing methods" do
+      let(:base) do
+        Class.new do
+          def self.transition_class; end
+
+          def self.initial_state; end
+        end
+      end
+
+      it "does not raise an error" do
+        expect { check_missing_methods! }.to_not raise_exception(NotImplementedError)
+      end
+    end
+
+    context "when base has missing methods" do
+      let(:base) do
+        Class.new
+      end
+
+      it "raises an error" do
+        expect { check_missing_methods! }.to raise_exception(NotImplementedError)
+      end
+    end
+  end
 end