Close #4683: i18n: make explicit titles in toctree translatable

tests/roots/test-intl/toctree.txt

@@ -0,0 +1,10 @@
+i18n with toctree
+=================
+
+.. toctree::
+   :caption: caption
+
+   figure <figure>
+   table
+   https://www.sphinx-doc.org/
+   self

tests/roots/test-intl/xx/LC_MESSAGES/toctree.po

@@ -0,0 +1,31 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) 
+# This file is distributed under the same license as the Sphinx intl <Tests> package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: Sphinx intl <Tests> 2013.120\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2019-11-01 10:24+0900\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: ../../toctree.txt:4
+msgid "figure"
+msgstr "FIGURE"
+
+#: ../../toctree.txt:4
+#: ../../toctree.txt:4
+msgid "caption"
+msgstr "CAPTION"
+
+#: ../../toctree.txt:2
+msgid "i18n with toctree"
+msgstr "I18N WITH TOCTREE"
+

tests/test_intl.py

@@ -465,6 +465,30 @@ def test_text_table(app):
         assert expect_msg.string in result
 
 
+@sphinx_intl
+@pytest.mark.sphinx('gettext')
+@pytest.mark.test_params(shared_result='test_intl_gettext')
+def test_gettext_toctree(app):
+    app.build()
+    # --- toctree
+    expect = read_po(app.srcdir / 'xx' / 'LC_MESSAGES' / 'toctree.po')
+    actual = read_po(app.outdir / 'toctree.pot')
+    for expect_msg in [m for m in expect if m.id]:
+        assert expect_msg.id in [m.id for m in actual if m.id]
+
+
+@sphinx_intl
+@pytest.mark.sphinx('text')
+@pytest.mark.test_params(shared_result='test_intl_basic')
+def test_text_toctree(app):
+    app.build()
+    # --- toctree
+    result = (app.outdir / 'toctree.txt').text()
+    expect = read_po(app.srcdir / 'xx' / 'LC_MESSAGES' / 'toctree.po')
+    for expect_msg in [m for m in expect if m.id]:
+        assert expect_msg.string in result
+
+
 @sphinx_intl
 @pytest.mark.sphinx('gettext')
 @pytest.mark.test_params(shared_result='test_intl_gettext')