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+++ b/tests/test_sphinx/sourcedirs/substitutions/index.md
@@ -0,0 +1,56 @@
+---
+myst:
+  substitutions:
+    text: "- text"
+    text_with_nest: >
+      output
+      with *Markdown*
+      {{ nested }}
+    nested: nested substitution
+    admonition: |
+      prefix
+
+      ```{note}
+      A note {{ nested }}
+      ```
+    inline_admonition: |
+      ```{note}
+      Inline note
+      ```
+    override: Overridden by front matter
+
+---
+
+{{ text_with_nest }}
+
+{{ admonition }}
+
+a {{ text }} b
+
+c {{ text_with_nest }} d
+
+e {{ inline_admonition }} f
+
+{{ conf }}
+
+{{ override }}
+
+This will process the substitution
+
+```{parsed-literal}
+{{ text_with_nest }}
+```
+
+This will not process the substitution
+
+```python
+{{ text_with_nest }}
+```
+
+Using env and filters:
+
+{{ env.docname | upper }}
+
+```{toctree}
+other.md
+```