Add tests for :dedent: option of code-block directive

tests/test_directive_code.py

@@ -580,3 +580,29 @@ def test_linenothreshold(app, status, warning):
     # literal include not using linenothreshold (no line numbers)
     assert ('<span></span><span class="c1"># Very small literal include '
             '(linenothreshold check)</span>' in html)
+
+@pytest.mark.sphinx('dummy', testroot='directive-code')
+def test_code_block_dedent(app, status, warning):
+    app.builder.build(['dedent'])
+    doctree = app.env.get_doctree('dedent')
+    codeblocks = list(doctree.traverse(nodes.literal_block))
+    # Note: comparison string should not have newlines at the beginning or end
+    text_0_indent = '''First line
+Second line
+    Third line
+Fourth line'''
+    text_2_indent = '''  First line
+  Second line
+      Third line
+  Fourth line'''
+    text_4_indent = '''    First line
+    Second line
+        Third line
+    Fourth line'''
+
+    assert codeblocks[0].astext() == text_0_indent
+    assert codeblocks[1].astext() == text_0_indent
+    assert codeblocks[2].astext() == text_4_indent
+    assert codeblocks[3].astext() == text_2_indent
+    assert codeblocks[4].astext() == text_4_indent
+    assert codeblocks[5].astext() == text_0_indent