[refactor] Pass builder via marker

pyproject.toml

@@ -57,4 +57,4 @@ check_flake8 = "flake8 src tests"
 check_mypy = "mypy src tests"
 
 [tool.pytest.ini_options]
-markers = ["sphinx_build_in_tempdir"]
+markers = ["sphinx_builder", "sphinx_build_in_tempdir"]

tests/conftest.py

@@ -28,13 +28,14 @@ def parsed_built_html(
     rootdir: Path,
 ):
     directory_name = get_marker_value(request, "sphinx_build_in_tempdir")
+    builder = get_marker_value(request, "sphinx_builder")
 
     srcdir = sphinx_test_tempdir / directory_name
     if not srcdir.exists():
         testroot_path = rootdir / f"test-{directory_name}"
         shutil.copytree(testroot_path, srcdir)
 
-    app = make_app("html", srcdir=srcdir)
+    app = make_app(builder, srcdir=srcdir)
     app.build()
 
     html = (app.outdir / "index.html").read_text()

tests/test_show_external_link_icon.py

@@ -7,6 +7,7 @@ def assert_is_external(reference, expected_url: str) -> None:
     assert reference["rel"] == ["noopener", "noreferrer"]
 
 
+@pytest.mark.sphinx_builder("html")
 @pytest.mark.sphinx_build_in_tempdir("external-link-icon")
 def test_see_external_link_icon(parsed_built_html):
     references = parsed_built_html.find_all("a", {"class": "reference"})
@@ -17,6 +18,7 @@ def test_see_external_link_icon(parsed_built_html):
     assert_is_external(ref, "https://pypi.org/project/sphinx-new-tab-link/")
 
 
+@pytest.mark.sphinx_builder("html")
 @pytest.mark.sphinx_build_in_tempdir("external-link-icon")
 def test_can_see_icon_with_image_directive_target(parsed_built_html):
     # https://github.com/ftnext/sphinx-new-tab-link/issues/16
@@ -32,6 +34,7 @@ def test_can_see_icon_with_image_directive_target(parsed_built_html):
     assert ref.svg
 
 
+@pytest.mark.sphinx_builder("html")
 @pytest.mark.sphinx_build_in_tempdir("external-link-icon")
 def test_can_see_icon_with_figure_directive_target(parsed_built_html):
     references = parsed_built_html.find_all("a", {"class": "reference"})