Rename WorkflowTest

This class name is already used elsewhere, so causes a
`superclass mismatch` error when both tests are run in the same
test run.

lib/engines/content_block_manager/test/unit/app/controllers/concerns/workflow/step_test.rb

@@ -0,0 +1,44 @@
+require "test_helper"
+
+class ContentBlockManager::ContentBlock::Workflow::StepTest < ActiveSupport::TestCase
+  extend Minitest::Spec::DSL
+
+  describe ".by_name" do
+    it "returns a step by its name" do
+      step = Workflow::Step.by_name("review_links")
+
+      assert_equal step&.name, :review_links
+    end
+  end
+
+  describe "#next_step" do
+    [
+      %i[edit_draft review_links],
+      %i[review_links schedule_publishing],
+      %i[schedule_publishing internal_note],
+      %i[internal_note change_note],
+      %i[change_note review],
+      %i[review confirmation],
+    ].each do |current_step, expected_step|
+      it "returns #{expected_step} step when the current step is #{current_step}" do
+        step = Workflow::Step.by_name(current_step)
+        assert_equal step&.next_step&.name, expected_step
+      end
+    end
+  end
+
+  describe "#previous_step" do
+    [
+      %i[review_links edit_draft],
+      %i[schedule_publishing review_links],
+      %i[internal_note schedule_publishing],
+      %i[change_note internal_note],
+      %i[review change_note],
+    ].each do |current_step, expected_step|
+      it "returns #{expected_step} step when the current step is #{current_step}" do
+        step = Workflow::Step.by_name(current_step)
+        assert_equal step&.previous_step&.name, expected_step
+      end
+    end
+  end
+end