we can pass assert_pass ..., model_at:, invoke_method:.

lib/trailblazer/test/assertion.rb

@@ -1,10 +1,19 @@
 module Trailblazer
   module Test
+    # Top-level entry points for end users.
+    # These methods expose the syntax sugar, not the logic.
     module Assertion
       # DISCUSS: move to Assertion::Minitest?
       # Test case instance method. Specific to Minitest.
-      def assert_pass(activity, options, assertion: AssertPass, **kws, &block)
-        assertion.(activity, options, test: self, user_block: block, **kws) # Forward {#assert_pass} to {AssertPass.call} or wherever your implementation sits.
+      def assert_pass(activity, options, assertion: AssertPass, model_at: :model, invoke_method: :call, **kws, &block)
+        # DISCUSS: {:model_at} and {:invoke_method} block actual attributes.
+        assertion.(activity, options,
+          test: self,
+          user_block: block,
+          expected_model_attributes: kws,
+          model_at: model_at,
+          invoke_method: invoke_method,
+        ) # Forward {#assert_pass} to {AssertPass.call} or wherever your implementation sits.
       end
 
       # DISCUSS: move to Assertion::Minitest?

lib/trailblazer/test/assertion/assert_pass.rb

@@ -4,7 +4,7 @@ module Assertion
       module AssertPass
         module_function
 
-        def call(activity, ctx, invoke_method: :call, model_at: :model, test:, user_block:, **expected_model_attributes)
+        def call(activity, ctx, invoke_method: :call, model_at: :model, test:, user_block:, expected_model_attributes:)
           result, ctx, kws = call_operation(ctx, operation: activity, invoke_method: invoke_method)
 
           assert_pass_with_model(result, ctx, expected_model_attributes: expected_model_attributes, test: test, user_block: user_block, model_at: model_at, operation: activity)

lib/trailblazer/test/assertion/suite.rb

@@ -50,14 +50,16 @@ def assert_pass(params_fragment, expected_attributes_to_merge, use_wtf=false, de
 
             activity = kws[:operation]  # FIXME.
             model_at = kws[:model_at]  # FIXME.
+            # invoke_method = kws[:invoke_method] if kws.key?(:invoke_method) # FIXME.
 
-            assertion.(activity, ctx, use_wtf: use_wtf, test: test, model_at: model_at, user_block: user_block, **expected_attributes)
+            assertion.(activity, ctx, invoke_method: invoke_method, test: test, model_at: model_at, user_block: user_block, **expected_attributes)
           end
 
           def assert_fail(params_fragment, expected_errors, use_wtf=false, assertion:, **kws)
             ctx, kws = normalize_for(params_fragment, use_wtf, **kws)
 
             activity = kws[:operation]  # FIXME.
+            # invoke_method = kws[:invoke_method]  # FIXME.
 
             assertion.(activity, ctx, expected_errors, **kws)
           end
@@ -75,7 +77,7 @@ def ctx_for_params_fragment(params_fragment, key_in_params:, default_ctx:, **)
           # Gather all test case configuration. This involves reading all test `let` directives.
           def normalize_kws(use_wtf, user_block:, test:, operation: test.operation, expected_attributes: test.expected_attributes, contract_name: "default", model_at: :model, **options)
             kws = {
-              user_block:           user_block,
+              # user_block:           user_block,
               operation:            operation,
               expected_attributes:  expected_attributes,
               test:                 test,

test/assertion_test.rb

@@ -73,7 +73,8 @@ def validate(ctx, params:, **)
         include Trailblazer::Test::Assertion
         include Trailblazer::Test::Assertion::AssertExposes
   it "#assert_pass" do
-    # assert_pass Create, {params: {title: 1}}, id: 1, invoke_method: :wtf?
+# FIXME: test that assert_* returns {ctx}
+# assert_pass Create, {params: {title: "Somewhere Far Beyond"}}, title: "Somewhere Far Beyond", invoke_method: :wtf?
 
     test =
       Class.new(Test) do
@@ -117,13 +118,29 @@ def validate(ctx, params:, **)
         end
 
         # test_0005_anonymous
+        # We accept {:invoke_method} as a first level kw arg, currently.
         it do
           stdout, _ = capture_io do
             assert_pass Create, {params: {title: "Somewhere Far Beyond"}}, title: "Somewhere Far Beyond", invoke_method: :wtf?
           end
 
           assert_equal stdout, %(`-- AssertionsTest::Create\n    |-- \e[32mStart.default\e[0m\n    |-- \e[32mmodel\e[0m\n    `-- End.success\n)
         end
+
+        # test_0006_anonymous
+        # We accept {:model_at} as a first level kw arg, currently.
+        it do
+          create = Class.new(Trailblazer::Operation) do
+            step :model
+
+            def model(ctx, params:, **)
+              ctx[:song] = Record.new(**params)
+            end
+          end
+
+          assert_pass create, {params: {title: "Somewhere Far Beyond"}}, title: "Somewhere Far Beyond", model_at: :song
+          # assert_pass Create, {params: {title: "Somewhere Far Beyond"}}, {invoke_method: :wtf?, model_at: }, {...} # DISCUSS: this would be an alternative syntax.
+        end
       end
 
     test_1 = test.new(:test_0001_anonymous)
@@ -155,6 +172,10 @@ def validate(ctx, params:, **)
     test_5 = test.new(:test_0005_anonymous)
     failures = test_5.()
     assert_equal failures.size, 0
+
+    test_6 = test.new(:test_0006_anonymous)
+    failures = test_6.()
+    assert_equal failures.size, 0
   end
 
           include Trailblazer::Test::Assertion