Test config file

Author: Bachmann1234

coverage/config.py

@@ -372,7 +372,7 @@ def from_file(self, filename, our_file):
         # [json]
         ('json_output', 'json:output'),
         ('json_pretty_print', 'json:pretty_print', 'boolean'),
-        ('show_contexts', 'json:show_contexts', 'boolean'),
+        ('json_show_contexts', 'json:show_contexts', 'boolean'),
     ]
 
     def _set_attr_from_config_option(self, cp, attr, where, type_=''):

tests/test_config.py

@@ -502,6 +502,17 @@ def test_non_ascii(self):
         self.assertEqual(cov.config.exclude_list, ["first", "✘weirdo", "third"])
         self.assertEqual(cov.config.html_title, "tabblo & «ταБЬℓσ» # numbers")
 
+    def test_json_config(self):
+        self.make_file(".coveragerc", """\
+            [json]
+            pretty_print = True
+            show_contexts = True
+            """)
+        cov = coverage.Coverage()
+
+        self.assertEqual(cov.config.json_show_contexts, True)
+        self.assertEqual(cov.config.json_pretty_print, True)
+
     def test_unreadable_config(self):
         # If a config file is explicitly specified, then it is an error for it
         # to not be readable.