diff --git a/tests/check_added_large_files_test.py b/tests/check_added_large_files_test.py
index 99c60cb..ce15f5c 100644
--- a/tests/check_added_large_files_test.py
+++ b/tests/check_added_large_files_test.py
@@ -80,11 +80,18 @@ xfailif_no_gitlfs = pytest.mark.xfail(
 def test_allows_gitlfs(temp_git_dir):  # pragma: no cover
     with temp_git_dir.as_cwd():
         # Work around https://github.com/github/git-lfs/issues/913
-        cmd_output('git', 'commit', '--allow-empty', '-m', 'foo')
+        cmd_output(
+            'git',
+            'commit',
+            '--no-gpg-sign',
+            '--allow-empty',
+            '-m',
+            'foo',
+        )
         cmd_output('git', 'lfs', 'install')
         temp_git_dir.join('f.py').write('a' * 10000)
         cmd_output('git', 'lfs', 'track', 'f.py')
-        cmd_output('git', 'add', '.')
+        cmd_output('git', 'add', '--', '.')
         # Should succeed
         assert main(('--maxkb', '9', 'f.py')) == 0
 
@@ -96,8 +103,8 @@ def test_moves_with_gitlfs(temp_git_dir):  # pragma: no cover
         cmd_output('git', 'lfs', 'track', 'a.bin', 'b.bin')
         # First add the file we're going to move
         temp_git_dir.join('a.bin').write('a' * 10000)
-        cmd_output('git', 'add', '.')
-        cmd_output('git', 'commit', '-am', 'foo')
+        cmd_output('git', 'add', '--', '.')
+        cmd_output('git', 'commit', '--no-gpg-sign', '-am', 'foo')
         # Now move it and make sure the hook still succeeds
         cmd_output('git', 'mv', 'a.bin', 'b.bin')
         assert main(('--maxkb', '9', 'b.bin')) == 0
diff --git a/tests/check_case_conflict_test.py b/tests/check_case_conflict_test.py
index b5f538a..077b41b 100644
--- a/tests/check_case_conflict_test.py
+++ b/tests/check_case_conflict_test.py
@@ -41,7 +41,7 @@ def test_file_conflicts_with_committed_file(temp_git_dir):
     with temp_git_dir.as_cwd():
         temp_git_dir.join('f.py').write("print('hello world')")
         cmd_output('git', 'add', 'f.py')
-        cmd_output('git', 'commit', '--no-verify', '-m', 'Add f.py')
+        cmd_output('git', 'commit', '--no-gpg-sign', '-n', '-m', 'Add f.py')
 
         temp_git_dir.join('F.py').write("print('hello world')")
         cmd_output('git', 'add', 'F.py')
diff --git a/tests/check_merge_conflict_test.py b/tests/check_merge_conflict_test.py
index a7dbea3..8141ade 100644
--- a/tests/check_merge_conflict_test.py
+++ b/tests/check_merge_conflict_test.py
@@ -23,23 +23,23 @@ def f1_is_a_conflict_file(tmpdir):
     repo2 = tmpdir.join('repo2')
     repo2_f1 = repo2.join('f1')
 
-    cmd_output('git', 'init', repo1.strpath)
+    cmd_output('git', 'init', '--', repo1.strpath)
     with repo1.as_cwd():
         repo1_f1.ensure()
-        cmd_output('git', 'add', repo1_f1.strpath)
-        cmd_output('git', 'commit', '-m', 'commit1')
+        cmd_output('git', 'add', '--', repo1_f1.strpath)
+        cmd_output('git', 'commit', '--no-gpg-sign', '-m', 'commit1')
 
     cmd_output('git', 'clone', repo1.strpath, repo2.strpath)
 
     # Commit in master
     with repo1.as_cwd():
         repo1_f1.write('parent\n')
-        cmd_output('git', 'commit', '-am', 'master commit2')
+        cmd_output('git', 'commit', '--no-gpg-sign', '-am', 'master commit2')
 
     # Commit in clone and pull
     with repo2.as_cwd():
         repo2_f1.write('child\n')
-        cmd_output('git', 'commit', '-am', 'clone commit2')
+        cmd_output('git', 'commit', '--no-gpg-sign', '-am', 'clone commit2')
         cmd_output('git', 'pull', retcode=None)
         # We should end up in a merge conflict!
         f1 = repo2_f1.read()
@@ -73,21 +73,21 @@ def repository_is_pending_merge(tmpdir):
     cmd_output('git', 'init', repo1.strpath)
     with repo1.as_cwd():
         repo1_f1.ensure()
-        cmd_output('git', 'add', repo1_f1.strpath)
-        cmd_output('git', 'commit', '-m' 'commit1')
+        cmd_output('git', 'add', '--', repo1_f1.strpath)
+        cmd_output('git', 'commit', '--no-gpg-sign', '-m', 'commit1')
 
     cmd_output('git', 'clone', repo1.strpath, repo2.strpath)
 
     # Commit in master
     with repo1.as_cwd():
         repo1_f1.write('parent\n')
-        cmd_output('git', 'commit', '-am', 'master commit2')
+        cmd_output('git', 'commit', '--no-gpg-sign', '-am', 'master commit2')
 
     # Commit in clone and pull without committing
     with repo2.as_cwd():
         repo2_f2.write('child\n')
-        cmd_output('git', 'add', repo2_f2.strpath)
-        cmd_output('git', 'commit', '-m', 'clone commit2')
+        cmd_output('git', 'add', '--', repo2_f2.strpath)
+        cmd_output('git', 'commit', '--no-gpg-sign', '-m', 'clone commit2')
         cmd_output('git', 'pull', '--no-commit')
         # We should end up in a pending merge
         assert repo2_f1.read() == 'parent\n'
diff --git a/tests/conftest.py b/tests/conftest.py
index c3dc342..87fec70 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -10,5 +10,5 @@ from pre_commit_hooks.util import cmd_output
 @pytest.yield_fixture
 def temp_git_dir(tmpdir):
     git_dir = tmpdir.join('gits')
-    cmd_output('git', 'init', git_dir.strpath)
+    cmd_output('git', 'init', '--', git_dir.strpath)
     yield git_dir