[TASK] Add test to prove proper error handling for plantuml

refs #965

Author: jaapio

tests/Integration/tests/graphs/plantuml-server-error/expected/index.html

@@ -0,0 +1,11 @@
+<!-- content start -->
+<div class="section" id="uml-directive">
+    <h1>Uml Directive</h1>
+    <figure
+            class="uml-diagram"
+            style="width: 1000"    ><figcaption>Figure 1-1: Application flow</figcaption></figure>
+    <figure
+            class="uml-diagram"
+            style="width: 1000"    ><figcaption>Figure 1-1: Application flow</figcaption></figure>
+</div>
+<!-- content end -->

tests/Integration/tests/graphs/plantuml-server-error/expected/logs/warning.log

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+app.WARNING: Failed to render diagram using url: https://example.com/svg/u-9ApaaiBbRGjLF8Byb8BN86ywmKSbEBYnFJKxcu0000. The server returned status code 500.  {"rst-file":"index"} []
+app.WARNING: Failed to render diagram using url: https://example.com/svg/u-9ApaaiBbRGjLF8Byb8BN86ywmKSbEBYnFJKxcu0000. The server returned status code 500.  {"rst-file":"index"} []

tests/Integration/tests/graphs/plantuml-server-error/input/Plantuml/something.plantuml

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+@startuml
+
+class -> otherClass : message
+
+@enduml

tests/Integration/tests/graphs/plantuml-server-error/input/guides.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<guides xmlns="https://www.phpdoc.org/guides"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="https://www.phpdoc.org/guides packages/guides-cli/resources/schema/guides.xsd">
+    <extension class="phpDocumentor\Guides\Graphs">
+        <renderer>plantuml-server</renderer>
+        <plantuml-server>https://example.com</plantuml-server>
+    </extension>
+</guides>

tests/Integration/tests/graphs/plantuml-server-error/input/index.rst

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+==============
+Uml Directive
+==============
+
+.. uml:: /Plantuml/something.plantuml
+   :align: center
+   :caption: Figure 1-1: Application flow
+   :width: 1000
+
+
+.. uml:: Plantuml/something.plantuml
+   :align: center
+   :caption: Figure 1-1: Application flow
+   :width: 1000