Allow parallel execution of tests in `test_search` (#11292)

Add various ``app.builder.build_all()`` calls.

tests/test_directive_code.py

@@ -456,7 +456,7 @@ def test_literalinclude_file_whole_of_emptyline(app, status, warning):
 
 @pytest.mark.sphinx('html', testroot='directive-code')
 def test_literalinclude_caption_html(app, status, warning):
-    app.builder.build('index')
+    app.builder.build_all()
     html = (app.outdir / 'caption.html').read_text(encoding='utf8')
     caption = ('<div class="code-block-caption">'
                '<span class="caption-number">Listing 2 </span>'

tests/test_search.py

@@ -110,6 +110,7 @@ def test_stemmer_does_not_remove_short_words(app):
 
 @pytest.mark.sphinx(testroot='search')
 def test_stemmer(app):
+    app.builder.build_all()
     searchindex = load_searchindex(app.outdir / 'searchindex.js')
     print(searchindex)
     assert is_registered_term(searchindex, 'findthisstemmedkei')
@@ -118,6 +119,7 @@ def test_stemmer(app):
 
 @pytest.mark.sphinx(testroot='search')
 def test_term_in_heading_and_section(app):
+    app.builder.build_all()
     searchindex = (app.outdir / 'searchindex.js').read_text(encoding='utf8')
     # if search term is in the title of one doc and in the text of another
     # both documents should be a hit in the search index as a title,
@@ -128,6 +130,7 @@ def test_term_in_heading_and_section(app):
 
 @pytest.mark.sphinx(testroot='search')
 def test_term_in_raw_directive(app):
+    app.builder.build_all()
     searchindex = load_searchindex(app.outdir / 'searchindex.js')
     assert not is_registered_term(searchindex, 'raw')
     assert is_registered_term(searchindex, 'rawword')