Add pytest tests for CLI

Author: rhpvorderman

tests/test_igzip_cli.py

@@ -0,0 +1,69 @@
+# Copyright (c) 2020 Leiden University Medical Center
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import gzip
+import io
+import sys
+
+from isal import igzip
+
+import pytest
+
+DATA = b'This is a simple test with igzip'
+COMPRESSED_DATA = gzip.compress(DATA)
+
+
+@pytest.mark.parametrize("level", range(1, 10))
+def test_decompress_stdin_stdout(capsysbinary, level):
+    """Test if the command line can decompress data that has been compressed
+    by gzip at all levels."""
+    mock_stdin = io.BytesIO(gzip.compress(DATA, level))
+    sys.stdin = io.TextIOWrapper(mock_stdin)
+    sys.argv = ["", "-d"]
+    igzip.main()
+    out, err = capsysbinary.readouterr()
+    assert out == DATA
+
+
+@pytest.mark.parametrize("level", [str(x) for x in range(4)])
+def test_compress_stdin_stdout(capsysbinary, level):
+    mock_stdin = io.BytesIO(DATA)
+    sys.stdin = io.TextIOWrapper(mock_stdin)
+    sys.argv = ["", f"-{level}"]
+    igzip.main()
+    out, err = capsysbinary.readouterr()
+    assert gzip.decompress(out) == DATA
+
+
+def test_decompress_infile_outfile(tmp_path):
+    test_file = tmp_path / "test"
+    compressed_temp = test_file.with_suffix(".gz")
+    compressed_temp.write_bytes(gzip.compress(DATA))
+    sys.argv = ['', '-d', str(compressed_temp)]
+    igzip.main()
+    assert test_file.read_bytes() == DATA
+
+
+def test_compress_infile_outfile(tmp_path):
+    test_file = tmp_path / "test"
+    test_file.write_bytes(DATA)
+    sys.argv = ['', str(test_file)]
+    igzip.main()
+    assert gzip.decompress(test_file.with_suffix(".gz").read_bytes()) == DATA