Remove test checking for a list of checksums for single file

Some time ago it was supported to have a list of checksums for a single
file which all must match. This is no longer the case as the checking
code expects a tuple.
Fix this and add tests for specifying `None` and tuples as values in the dict.

test/framework/type_checking.py

@@ -200,9 +200,6 @@ def test_check_type_of_param_value_checksums(self):
             [('md5', md5_checksum), ('sha256', sha256_checksum1)],
             # checksum as dict (file to checksum mapping)
             [{'foo.txt': sha256_checksum1, 'bar.txt': sha256_checksum2}],
-            # list of checksums for a single file
-            [[md5_checksum]],
-            [[sha256_checksum1, sha256_checksum2, sha256_checksum3]],
             # in the mix (3 files, each a different kind of checksum spec)...
             [
                 sha256_checksum1,
@@ -211,20 +208,30 @@ def test_check_type_of_param_value_checksums(self):
             ],
             # each item can be a list of checksums for a single file, which can be of different types...
             [
-                # two checksums for a single file, *both* should match
-                [sha256_checksum1, md5_checksum],
-                # three checksums for a single file, *all* should match
-                [sha256_checksum1, ('md5', md5_checksum), {'foo.txt': sha256_checksum1}],
+                # two alternative checksums for a single file
+                (sha256_checksum1, md5_checksum),
+                # three alternative checksums for a single file
+                (sha256_checksum1, ('md5', md5_checksum), {'foo.txt': sha256_checksum1}),
                 # single checksum for a single file
                 sha256_checksum1,
                 # filename-to-checksum mapping
                 {'foo.txt': sha256_checksum1, 'bar.txt': sha256_checksum2},
-                # 3 alternative checksums for a single file, one match is sufficient
+                # 3 alternative checksums for a single file
                 (sha256_checksum1, sha256_checksum2, sha256_checksum3),
-            ]
+            ],
+            [
+                # Normal checksum
+                sha256_checksum1,
+                # None is allowed to skip checksum checking
+                None,
+                # Also in mappings
+                {'foo.txt': sha256_checksum1, 'bar.txt': None},
+                # alternative checksums are also allowed
+                {'foo.txt': (sha256_checksum2, sha256_checksum3), 'bar.txt': (sha256_checksum1, md5_checksum)},
+            ],
         ]
         for inp in inputs:
-            self.assertEqual(check_type_of_param_value('checksums', inp), (True, inp))
+            self.assertTrue(check_type_of_param_value('checksums', inp), 'Failed for ' + str(inp))
 
     def test_check_type_of_param_value_patches(self):
         """Test check_type_of_param_value function for patches."""