1 files changed, 58 insertions, 0 deletions
diff --git a/tests/test_builders/test_build_html_maths.py b/tests/test_builders/test_build_html_maths.py
new file mode 100644
index 0000000..900846b
--- /dev/null
+++ b/tests/test_builders/test_build_html_maths.py
@@ -0,0 +1,58 @@
+import pytest
+
+from sphinx.errors import ConfigError
+
+
+@pytest.mark.sphinx('html', testroot='basic')
+def test_default_html_math_renderer(app, status, warning):
+    assert app.builder.math_renderer_name == 'mathjax'
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinx.ext.mathjax']})
+def test_html_math_renderer_is_mathjax(app, status, warning):
+    assert app.builder.math_renderer_name == 'mathjax'
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinx.ext.imgmath']})
+def test_html_math_renderer_is_imgmath(app, status, warning):
+    assert app.builder.math_renderer_name == 'imgmath'
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinxcontrib.jsmath',
+                                                  'sphinx.ext.imgmath']})
+def test_html_math_renderer_is_duplicated(make_app, app_params):
+    args, kwargs = app_params
+    with pytest.raises(
+        ConfigError,
+        match='Many math_renderers are registered. But no math_renderer is selected.',
+    ):
+        make_app(*args, **kwargs)
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinx.ext.imgmath',
+                                                  'sphinx.ext.mathjax']})
+def test_html_math_renderer_is_duplicated2(app, status, warning):
+    # case of both mathjax and another math_renderer is loaded
+    assert app.builder.math_renderer_name == 'imgmath'  # The another one is chosen
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinxcontrib.jsmath',
+                                                  'sphinx.ext.imgmath'],
+                                   'html_math_renderer': 'imgmath'})
+def test_html_math_renderer_is_chosen(app, status, warning):
+    assert app.builder.math_renderer_name == 'imgmath'
+
+
+@pytest.mark.sphinx('html', testroot='basic',
+                    confoverrides={'extensions': ['sphinxcontrib.jsmath',
+                                                  'sphinx.ext.mathjax'],
+                                   'html_math_renderer': 'imgmath'})
+def test_html_math_renderer_is_mismatched(make_app, app_params):
+    args, kwargs = app_params
+    with pytest.raises(ConfigError, match="Unknown math_renderer 'imgmath' is given."):
+        make_app(*args, **kwargs)