diff --git a/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf-tests.yml b/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf-tests.yml
new file mode 100644
index 00000000000..49d9c71fad9
--- /dev/null
+++ b/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf-tests.yml
@@ -0,0 +1,12 @@
+- doc: |
+    INLINE_UDT_BASIC: Cat through a single inline user-defined tool step.
+    Input file content round-trips to the workflow output unchanged.
+  job:
+    input1:
+      class: File
+      contents: "hello inline udt\n"
+  outputs:
+    wf_output:
+      asserts:
+        - that: has_text
+          text: "hello inline udt"
diff --git a/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf.yml b/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf.yml
new file mode 100644
index 00000000000..03a6c30f048
--- /dev/null
+++ b/lib/galaxy_test/workflow/inline_user_defined_tool.gxwf.yml
@@ -0,0 +1,34 @@
+class: GalaxyWorkflow
+doc: |
+  Workflow with one inline user-defined tool (UDT) step. Exercises the
+  end-to-end path through Galaxy: format2 normalization (including
+  _expand_format2 pass-through for GalaxyUserToolStub, gxformat2 PR #218),
+  workflow import with tool_representation, on-import DynamicTool
+  registration, and execution via the YAML tool runtime.
+inputs:
+  input1:
+    type: data
+outputs:
+  wf_output:
+    outputSource: udt_cat/output1
+steps:
+  udt_cat:
+    run:
+      class: GalaxyUserTool
+      id: cat_user_defined
+      version: "0.1"
+      name: cat_user_defined
+      description: concatenates a file
+      container: busybox
+      shell_command: cat '$(inputs.input1.path)' > output.txt
+      inputs:
+        - name: input1
+          type: data
+          format: txt
+      outputs:
+        - name: output1
+          type: data
+          format: txt
+          from_work_dir: output.txt
+    in:
+      input1: input1