tests: load json with no fallback

The json module should be available in Python 2.6 or newer.

tests/hghave.py

@@ -335,21 +335,6 b' def has_pygments():'
     except ImportError:
         return False
 
-@check("json", "some json module available")
-def has_json():
-    try:
-        import json
-        json.dumps
-        return True
-    except ImportError:
-        try:
-            import simplejson as json
-            json.dumps
-            return True
-        except ImportError:
-            pass
-    return False
-
 @check("outer-repo", "outer repo")
 def has_outer_repo():
     # failing for other reasons than 'no repo' imply that there is a repo

tests/run-tests.py

@@ -48,6 +48,7 b' from __future__ import print_function'
 from distutils import version
 import difflib
 import errno
+import json
 import optparse
 import os
 import shutil
@@ -69,15 +70,6 b' from xml.dom import minidom'
 import unittest
 
 osenvironb = getattr(os, 'environb', os.environ)
-
-try:
-    import json
-except ImportError:
-    try:
-        import simplejson as json
-    except ImportError:
-        json = None
-
 processlock = threading.Lock()
 
 if sys.version_info > (3, 5, 0):
@@ -1725,8 +1717,6 b' class TextTestRunner(unittest.TextTestRu'
                     xuf.write(doc.toprettyxml(indent='  ', encoding='utf-8'))
 
             if self._runner.options.json:
-                if json is None:
-                    raise ImportError("json module not installed")
                 jsonpath = os.path.join(self._runner._testdir, 'report.json')
                 with open(jsonpath, 'w') as fp:
                     timesd = {}

tests/test-hgweb-json.t

@@ -1,4 +1,3 b''
-#require json
 #require serve
 
   $ request() {

tests/test-run-tests.t

@@ -530,8 +530,6 b" Missing skips or blacklisted skips don't"
           "result": "skip"
       }
   } (no-eol)
-#if json
-
 test for --json
 ==================
 
@@ -634,8 +632,6 b' Test that failed test accepted through i'
   } (no-eol)
   $ mv backup test-failure.t
 
-#endif
-
 backslash on end of line with glob matching is handled properly
 
   $ cat > test-glob-backslash.t << EOF