py3: Remove Python 2 tests

Tests don't need to support Python 2 any longer. Do not run tests with
Python 2.

.github/workflows/tests.yml

@@ -52,8 +52,6 @@ jobs:
         python-version: [3.6, 3.9]
         include:
           # on Ubuntu run these as well
-          - os: ubuntu-20.04
-            python-version: 2.7
           - os: ubuntu-20.04
             python-version: 3.7
           - os: ubuntu-20.04

tests/fixtures.py

@@ -8,7 +8,6 @@
 # See the License for the specific language governing permissions and limitations under the License.
 
 import os
-import sys
 import os.path
 import binascii
 import contextlib

tests/test_freeze.py

@@ -5,7 +5,6 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the License
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
-import sys
 import textwrap
 
 import pytest
@@ -174,7 +173,6 @@ def test_serialize_features():
     roundtrip_feature(capa.features.file.Import("#11"))
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
 def test_freeze_sample(tmpdir, z9324d_extractor):
     # tmpdir fixture handles cleanup
     o = tmpdir.mkdir("capa").join("test.frz").strpath
@@ -182,7 +180,6 @@ def test_freeze_sample(tmpdir, z9324d_extractor):
     assert capa.features.freeze.main([path, o, "-v"]) == 0
 
 
-@pytest.mark.xfail(sys.version_info >= (3, 0), reason="vivsect only works on py2")
 def test_freeze_load_sample(tmpdir, z9324d_extractor):
     o = tmpdir.mkdir("capa").join("test.frz")
 

tests/test_helpers.py

@@ -12,8 +12,6 @@ from capa.features.extractors import helpers
 
 
 def test_all_zeros():
-    # Python 2: <str>
-    # Python 3: <bytes>
     a = b"\x00\x00\x00\x00"
     b = codecs.decode("00000000", "hex")
     c = b"\x01\x00\x00\x00"

tests/test_main.py

@@ -6,7 +6,6 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the License
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
-import sys
 import json
 import textwrap
 
@@ -58,10 +57,6 @@ def test_main_single_rule(z9324d_extractor, tmpdir):
 
 
 def test_main_non_ascii_filename(pingtaest_extractor, tmpdir, capsys):
-    # on py2.7, need to be careful about str (which can hold bytes)
-    #  vs unicode (which is only unicode characters).
-    # on py3, this should not be needed.
-    #
     # here we print a string with unicode characters in it
     # (specifically, a byte string with utf-8 bytes in it, see file encoding)
     assert capa.main.main(["-q", pingtaest_extractor.path]) == 0
@@ -69,20 +64,14 @@ def test_main_non_ascii_filename(pingtaest_extractor, tmpdir, capsys):
     std = capsys.readouterr()
     # but here, we have to use a unicode instance,
     # because capsys has decoded the output for us.
-    if sys.version_info >= (3, 0):
-        assert pingtaest_extractor.path in std.out
-    else:
-        assert pingtaest_extractor.path.decode("utf-8") in std.out
+    assert pingtaest_extractor.path in std.out
 
 
 def test_main_non_ascii_filename_nonexistent(tmpdir, caplog):
     NON_ASCII_FILENAME = "täst_not_there.exe"
     assert capa.main.main(["-q", NON_ASCII_FILENAME]) == -1
 
-    if sys.version_info >= (3, 0):
-        assert NON_ASCII_FILENAME in caplog.text
-    else:
-        assert NON_ASCII_FILENAME.decode("utf-8") in caplog.text
+    assert NON_ASCII_FILENAME in caplog.text
 
 
 def test_main_shellcode(z499c2_extractor):
@@ -370,16 +359,15 @@ def test_not_render_rules_also_matched(z9324d_extractor, capsys):
 
 # It tests main works with different backends
 def test_backend_option(capsys):
-    if sys.version_info > (3, 0):
-        path = get_data_path_by_name("pma16-01")
-        assert capa.main.main([path, "-j", "-b", capa.main.BACKEND_VIV]) == 0
-        std = capsys.readouterr()
-        std_json = json.loads(std.out)
-        assert std_json["meta"]["analysis"]["extractor"] == "VivisectFeatureExtractor"
-        assert len(std_json["rules"]) > 0
+    path = get_data_path_by_name("pma16-01")
+    assert capa.main.main([path, "-j", "-b", capa.main.BACKEND_VIV]) == 0
+    std = capsys.readouterr()
+    std_json = json.loads(std.out)
+    assert std_json["meta"]["analysis"]["extractor"] == "VivisectFeatureExtractor"
+    assert len(std_json["rules"]) > 0
 
-        assert capa.main.main([path, "-j", "-b", capa.main.BACKEND_SMDA]) == 0
-        std = capsys.readouterr()
-        std_json = json.loads(std.out)
-        assert std_json["meta"]["analysis"]["extractor"] == "SmdaFeatureExtractor"
-        assert len(std_json["rules"]) > 0
+    assert capa.main.main([path, "-j", "-b", capa.main.BACKEND_SMDA]) == 0
+    std = capsys.readouterr()
+    std_json = json.loads(std.out)
+    assert std_json["meta"]["analysis"]["extractor"] == "SmdaFeatureExtractor"
+    assert len(std_json["rules"]) > 0

tests/test_smda_features.py

@@ -15,7 +15,6 @@ from fixtures import *
     FEATURE_PRESENCE_TESTS,
     indirect=["sample", "scope"],
 )
-@pytest.mark.xfail(sys.version_info < (3, 0), reason="SMDA only works on py3")
 @pytest.mark.xfail(sys.platform == "win32", reason="SMDA bug: https://github.com/danielplohmann/smda/issues/20")
 def test_smda_features(sample, scope, feature, expected):
     do_test_feature_presence(get_smda_extractor, sample, scope, feature, expected)
@@ -27,5 +26,4 @@ def test_smda_features(sample, scope, feature, expected):
     indirect=["sample", "scope"],
 )
 def test_smda_feature_counts(sample, scope, feature, expected):
-    with xfail(sys.version_info < (3, 0), reason="SMDA only works on py3"):
-        do_test_feature_count(get_smda_extractor, sample, scope, feature, expected)
+    do_test_feature_count(get_smda_extractor, sample, scope, feature, expected)