add autogenerated tests.

test/docs/autogenerated/activity_basics_test.rb

@@ -0,0 +1,72 @@
+# THIS FILE IS AUTOGENERATED FROM trailblazer-activity-dsl-linear/test/docs/activity_basics_test.rb
+require "test_helper"
+
+module X
+  class DocsActivityTest < Minitest::Spec
+    it "basic activity" do
+      Memo = Struct.new(:options) do
+        def save
+          true
+        end
+      end
+
+      #:memo-create
+      module Memo::Operation
+        class Create < Trailblazer::Operation
+          step :validate
+          #~body
+          step :save
+          left :handle_errors
+          step :notify
+          #~meths
+          include T.def_steps(:validate, :save, :handle_errors, :notify)
+
+          #:save
+          def save(ctx, params:, **)
+            memo = Memo.new(params[:memo])
+            memo.save
+
+            ctx[:model] = memo # you can write to the {ctx}.
+          end
+          #:save end
+
+          def notify(ctx, **)
+            true
+          end
+
+          #~body end
+          def validate(ctx, params:, **) # home-made validation
+            params.key?(:memo) &&
+            params[:memo].key?(:text) &&
+            params[:memo][:text].size > 9
+            # return value matters!
+          end
+          #~meths end
+        end
+      end
+      #:memo-create end
+
+      #:memo-call
+      result = Memo::Operation::Create.(
+        params: {memo: {text: "Do not forget!"}}
+      )
+
+      result.success? # => true
+      puts result.terminus.to_h[:semantic] #=> :success
+      #:memo-call end
+
+      #:memo-call-model
+      result = Memo::Operation::Create.(
+        params: {memo: {text: "Do not forget!"}}
+      )
+
+      #~ctx_to_result
+      puts result[:model] #=> #<Memo id: 1 text: "Do not forget!">
+      #:memo-call-model end
+      #~ctx_to_result end
+
+      assert_equal result.terminus.inspect, %(#<Trailblazer::Activity::Railway::End::Success semantic=:success>)
+      #~ignore end
+    end
+  end
+end