ENH: Tests can be run as script

The tests can now be run individually as a script.

pphelper/tests/test_image.py

@@ -33,3 +33,8 @@
 #     assert np.allclose(fft, fft_expected)
 #     assert np.allclose(amplitude, amplitude_expected)
 #     assert np.allclose(phase, phase_expected)
+
+
+if __name__=='__main__':
+    import pytest
+    pytest.main()

pphelper/tests/test_racemodel.py

@@ -1497,3 +1497,8 @@ def test_gen_cdfs_from_dataframe():
     ).equals(result_expected)
 
     assert result.index.equals(result_expected.index)
+
+
+if __name__=='__main__':
+    import pytest
+    pytest.main()

pphelper/tests/test_sdt.py

@@ -73,3 +73,8 @@ def test_criterion_strict():
     result_expected = 0.82920933172271627
     result = criterion(hits, fas, n)
     assert np.allclose(result, result_expected)
+
+
+if __name__=='__main__':
+    import pytest
+    pytest.main()

pphelper/tests/test_utils.py

@@ -46,3 +46,8 @@ def test_get_max_from_list():
     result = get_max_from_list(data)
 
     assert result == result_expected
+
+
+if __name__=='__main__':
+    import pytest
+    pytest.main()