Add unit test for issue sphinx-doc#11110 as fixed by sphinx-doc#11113

tests/roots/test-ext-imgmockconverter/conf.py

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+import os
+import sys
+
+sys.path.insert(0, os.path.abspath('.'))
+extensions = ['mocksvgconverter']

tests/roots/test-ext-imgmockconverter/index.rst

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+test-ext-imgconverter
+=====================
+
+.. image:: ./1/svgimg.svg
+.. image:: ./2/svgimg.svg
+

tests/roots/test-ext-imgmockconverter/mocksvgconverter.py

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+"""
+    Does foo.svg --> foo.pdf with no change to the file.
+"""
+
+import shutil
+
+from sphinx.transforms.post_transforms.images import ImageConverter
+
+if False:
+    # For type annotation
+    from typing import Any, Dict  # NOQA
+
+    from sphinx.application import Sphinx  # NOQA
+
+class MyConverter(ImageConverter):
+    conversion_rules = [
+        ('image/svg+xml', 'application/pdf'),
+    ]
+
+    def is_available(self):
+        # type: () -> bool
+        return True
+
+    def convert(self, _from, _to):
+        # type: (unicode, unicode) -> bool
+        """Mock converts the image from SVG to PDF."""
+        shutil.copyfile(_from, _to)
+        return True
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[unicode, Any]
+    app.add_post_transform(MyConverter)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

tests/test_ext_imgmockconverter.py

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+"""Test image converter with identical basenames"""
+
+import pytest
+
+
+@pytest.mark.sphinx('latex', testroot='ext-imgmockconverter')
+def test_ext_imgmockconverter(app, status, warning):
+    app.builder.build_all()
+
+    content = (app.outdir / 'python.tex').read_text(encoding='utf8')
+
+    # check identical basenames give distinct files
+    assert '\\sphinxincludegraphics{{svgimg}.pdf}' in content
+    assert '\\sphinxincludegraphics{{svgimg1}.pdf}' in content
+    assert not (app.outdir / 'svgimg.svg').exists()
+    assert (app.outdir / 'svgimg.pdf').exists()
+    assert (app.outdir / 'svgimg1.pdf').exists()