tests: use tabulate to compare tables (#38067)

Comparing strings with assert gives better diffs thant comparing list of
lists when using the pytest's `-vv` option.

tests/test_schema2.py

@@ -1,7 +1,9 @@
 import json
 import os
+import re
 
 import pytest
+from tabulate import tabulate
 
 from utils import login, get_table
 
@@ -20,6 +22,14 @@ def pytest_generate_tests(metafunc):
             metafunc.parametrize(['visualization'], [[x] for x in tables])
 
 
+def assert_equal_tables(table1, table2):
+    t1 = tabulate(table1)
+    t2 = tabulate(table2)
+    t1 = re.sub(' +', ' ', t1)
+    t2 = re.sub(' +', ' ', t2)
+    assert t1 == t2
+
+
 @pytest.fixture(autouse=True)
 def freezetime(freezer):
     freezer.move_to('2018-12-07 16:53:00')
@@ -31,4 +41,7 @@ def test_simple(schema2, app, admin, visualization):
 
     visualization_page = response.click(lambda x: x == visualization)
     assert 'big-msg-info' not in visualization_page
-    assert schema2['tables'][visualization] == get_table(visualization_page)
+    table = get_table(visualization_page)
+    assert_equal_tables(
+        schema2['tables'][visualization],
+        table)

tox.ini

@@ -24,6 +24,7 @@ deps =
 	WebTest
 	django-webtest<1.9.3
 	pyquery
+	tabulate
 commands =
         dj111: py.test {posargs: --junitxml=test_{envname}_results.xml --cov-report xml --cov-report html --cov=bijoe tests/}
 [pytest]