Fix #3859: manpage: code-block captions are not displayed correctly

tests/test_build_manpage.py

@@ -25,3 +25,24 @@ def test_all(app, status, warning):
     # term of definition list including nodes.strong
     assert '\n.B term1\n' in content
     assert '\nterm2 (\\fBstronged partially\\fP)\n' in content
+
+
+@pytest.mark.sphinx('man', testroot='directive-code')
+def test_captioned_code_block(app, status, warning):
+    app.builder.build_all()
+    content = (app.outdir / 'python.1').text()
+
+    assert ('.sp\n'
+            'caption \\fItest\\fP rb\n'
+            '.INDENT 0.0\n'
+            '.INDENT 3.5\n'
+            '.sp\n'
+            '.nf\n'
+            '.ft C\n'
+            'def ruby?\n'
+            '    false\n'
+            'end\n'
+            '.ft P\n'
+            '.fi\n'
+            '.UNINDENT\n'
+            '.UNINDENT\n' in content)