Fixed #4901 -- Modified assertContains to provide a default check of 'any instances of text in content'. Thanks for the suggestion, nis@superlativ.dk.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5731 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/test/testcases.py

@@ -73,19 +73,23 @@ class TestCase(unittest.TestCase):
             "Couldn't retrieve redirection page '%s': response code was %d (expected %d)" % 
                 (path, redirect_response.status_code, target_status_code))
     
-    def assertContains(self, response, text, count=1, status_code=200):
+    def assertContains(self, response, text, count=None, status_code=200):
         """Assert that a response indicates that a page was retreived successfully,
         (i.e., the HTTP status code was as expected), and that ``text`` occurs ``count``
-        times in the content of the response.
+        times in the content of the response. If ``count`` is None, the count doesn't
+        matter - the assertion is true if the text occurs at least once in the response.
         
         """
         self.assertEqual(response.status_code, status_code,
             "Couldn't retrieve page: Response code was %d (expected %d)'" % 
                 (response.status_code, status_code))
         real_count = response.content.count(text)
-        self.assertEqual(real_count, count,
+        if count:
-            "Found %d instances of '%s' in response (expected %d)" % (real_count, text, count))
+            self.assertEqual(real_count, count,
-    
+                "Found %d instances of '%s' in response (expected %d)" % (real_count, text, count))
+        else:
+            self.assertTrue(real_count != 0, "Couldn't find '%s' in response" % text)
+                
     def assertFormError(self, response, form, field, errors):
         "Assert that a form used to render the response has a specific field error"
         if not response.context:

docs/testing.txt

@@ -481,10 +481,11 @@ Normal Python unit tests have a wide range of assertions, such as
 ``django.TestCase`` adds to these, providing some assertions
 that can be useful in testing the behavior of web sites.
 
-``assertContains(response, text, count=1, status_code=200)``
+``assertContains(response, text, count=None, status_code=200)``
     Assert that a response indicates that a page could be retrieved and
-    produced the nominated status code, and that ``text`` occurs ``count``
+    produced the nominated status code, and that ``text`` in the content 
-    times in the content of the response.
+    of the response. If ``count`` is provided, ``text`` must occur exactly 
+    ``count`` times in the response.
 
 ``assertFormError(response, form, field, errors)``
     Assert that a field on a form raised the provided list of errors when

tests/regressiontests/test_client_regress/models.py

@@ -6,6 +6,36 @@ from django.test import Client, TestCase
 from django.core import mail
 import os
 
+class AssertContainsTests(TestCase):
+    def test_contains(self):
+        "Reponses can be inspected for content, including counting repeated substrings"
+        response = self.client.get('/test_client_regress/no_template_view/')
+        
+        self.assertContains(response, 'once')
+        self.assertContains(response, 'once', 1)
+        self.assertContains(response, 'twice')
+        self.assertContains(response, 'twice', 2)
+
+        try:
+            self.assertContains(response, 'once', 2)
+        except AssertionError, e:
+            self.assertEquals(str(e), "Found 1 instances of 'once' in response (expected 2)")
+        
+        try:
+            self.assertContains(response, 'twice', 1)
+        except AssertionError, e:
+            self.assertEquals(str(e), "Found 2 instances of 'twice' in response (expected 1)")
+        
+        try:
+            self.assertContains(response, 'thrice')
+        except AssertionError, e:
+            self.assertEquals(str(e), "Couldn't find 'thrice' in response")
+
+        try:
+            self.assertContains(response, 'thrice', 3)
+        except AssertionError, e:
+            self.assertEquals(str(e), "Found 0 instances of 'thrice' in response (expected 3)")
+        
 class AssertTemplateUsedTests(TestCase):
     fixtures = ['testdata.json']
     

tests/regressiontests/test_client_regress/views.py

@@ -4,7 +4,7 @@ from django.shortcuts import render_to_response
 
 def no_template_view(request):
     "A simple view that expects a GET request, and returns a rendered template"
-    return HttpResponse("No template used")
+    return HttpResponse("No template used. Sample content: twice once twice. Content ends.")
 
 def file_upload_view(request):
     """