Fixed #23768 -- Rewrote template tests as unit tests.

tests/template_tests/syntax_tests/test_numpy.py

@@ -0,0 +1,41 @@
+from unittest import skipIf
+
+from django.conf import settings
+from django.test import TestCase
+
+from .utils import render, setup
+
+try:
+    import numpy
+except ImportError:
+    numpy = False
+
+
+@skipIf(numpy is False, "Numpy must be installed to run these tests.")
+class NumpyTests(TestCase):
+
+    @setup({'numpy-array-index01': '{{ var.1 }}'})
+    def test_numpy_array_index01(self):
+        """
+        Numpy's array-index syntax allows a template to access a certain
+        item of a subscriptable object.
+        """
+        output = render(
+            'numpy-array-index01',
+            {'var': numpy.array(["first item", "second item"])},
+        )
+        self.assertEqual(output, 'second item')
+
+    @setup({'numpy-array-index02': '{{ var.5 }}'})
+    def test_numpy_array_index02(self):
+        """
+        Fail silently when the array index is out of range.
+        """
+        output = render(
+            'numpy-array-index02',
+            {'var': numpy.array(["first item", "second item"])},
+        )
+        if settings.TEMPLATE_STRING_IF_INVALID:
+            self.assertEqual(output, 'INVALID')
+        else:
+            self.assertEqual(output, '')