test: check content and slide number

Author: mcanouil

tests/docs/smoke-all/2025/02/01/11896.qmd

@@ -0,0 +1,23 @@
+---
+title: Pagebreak should have no effect on slide count
+format: pptx
+_quarto:
+  tests:
+    pptx:
+      ensurePptxMaxSlides:
+        - 2
+      ensurePptxXpath:
+        - 
+          - 1
+          - 
+            - '<a:t>Before</a:t></a:r></a:p><a:p><a:pPr lvl="0" indent="0" marL="0"><a:buNone /></a:pPr><a:r><a:rPr /><a:t>After</a:t>'
+          - []
+---
+
+## Slide 
+
+Before
+
+{{< pagebreak >}}
+
+After