Make tests pass for python 3.6

setup.cfg

@@ -29,10 +29,10 @@ install_requires =
 
 setup_requires = setuptools>=44; setuptools_scm[toml]>=3.4.3
 include_package_data = True
-tests_require = pytest; typeguard; pygments>=2.16.0; littleutils
+tests_require = pytest; typeguard; pygments; littleutils
 
 [options.extras_require]
-tests = pytest; typeguard; pygments>=2.16.0; littleutils; cython
+tests = pytest; typeguard; pygments; littleutils; cython
 
 [coverage:run]
 relative_files = True

tests/__init__.py

@@ -1,7 +1,10 @@
 import os
 
 import pyximport
-from typeguard import install_import_hook
+try:
+    from typeguard import install_import_hook
+except ImportError:
+    from typeguard.importhook import install_import_hook
 
 pyximport.install(language_level=3)
 

tests/test_serializer.py

@@ -39,4 +39,4 @@ def test_example():
         )
 
 
-    compare_to_file_json(result, "serialize")
+    compare_to_file_json(result, "serialize", pygmented=True)

tests/utils.py

@@ -1,9 +1,19 @@
 import os
 
+import pygments
 from littleutils import string_to_file, file_to_string, json_to_file, file_to_json
 
 
+def parse_version(version: str):
+    return tuple(int(x) for x in version.split("."))
+
+
+old_pygments = parse_version(pygments.__version__) < (2, 16, 1)
+
+
 def compare_to_file(text, name):
+    if old_pygments and "pygment" in name:
+        return
     filename = os.path.join(
         os.path.dirname(__file__),
         'golden_files',
@@ -16,7 +26,9 @@ def compare_to_file(text, name):
         assert text == expected_output
 
 
-def compare_to_file_json(data, name):
+def compare_to_file_json(data, name, *, pygmented):
+    if old_pygments and pygmented:
+        return
     filename = os.path.join(
         os.path.dirname(__file__),
         'golden_files',