test: add semantic indent test cases to pre-commit test

Author: KyleKing

tests/pre-commit-test-align_semantic_breaks_in_numbered_lists.md

@@ -1,4 +1,6 @@
-# Semantic Line Indents
+# Testing `--align-semantic-breaks-in-numbered-lists`
+
+## Semantic Line Indents
 
 See discussion on: https://github.com/KyleKing/mdformat-mkdocs/issues/4
 
@@ -12,3 +14,27 @@ See discussion on: https://github.com/KyleKing/mdformat-mkdocs/issues/4
    five (three). It needs to be so, because
 
    Otherwise this next paragraph doesn't belong in the same list item.
+
+## Code block in semantic indent
+
+From: https://github.com/KyleKing/mdformat-mkdocs/issues/6
+
+1. Item 1
+   with a semantic line feed
+
+   ```bash
+   echo "I get moved around by prettier/mdformat, originally I am 3 spaces deep"
+   ```
+
+1. Item 2
+
+1. Item 3
+
+## Nested semantic lines
+
+From: https://github.com/KyleKing/mdformat-mkdocs/issues/7
+
+1. Line
+   semantic line 1 (3 spaces deep)
+    - Bullet (4 spaces deep)
+      semantic line 2 (6 spaces deep)