Add test for #4066 latex \index indent fix

tests/roots/test-latex-index/conf.py

@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+
+master_doc = 'index'

tests/roots/test-latex-index/index.rst

@@ -0,0 +1,12 @@
+test-latex-index
+================
+
+A :index:`famous` :index:`equation`:
+
+.. math::
+
+   E = m c^2
+
+.. index:: Einstein, relativity
+
+and some text.

tests/test_build_latex.py

@@ -1020,3 +1020,12 @@ def test_latex_remote_images(app, status, warning):
     assert '\\sphinxincludegraphics{{NOT_EXIST}.PNG}' not in result
     assert ('WARNING: Could not fetch remote image: '
             'http://example.com/NOT_EXIST.PNG [404]' in warning.getvalue())
+
+
+@pytest.mark.sphinx('latex', testroot='latex-index')
+def test_latex_index(app, status, warning):
+    app.builder.build_all()
+
+    result = (app.outdir / 'Python.tex').text(encoding='utf8')
+    assert 'A \\index{famous}famous \\index{equation}equation:\n' in result
+    assert '\n\\index{Einstein}\\index{relativity}\\ignorespaces \nand' in result