test: Add output path and name resolution tests.

tests/test_output_args.py

@@ -0,0 +1,52 @@
+# vim:set et sw=4 ts=4:
+"""
+Test sanitisation of --output arg
+"""
+
+import os
+import pytest
+from pathlib import Path
+
+from tartex.tartex import TarTeX
+
+
+@pytest.fixture
+def sample_tex():
+    return "sample.tex"
+
+def test_output_default(sample_tex):
+    """
+    Check correct tar suffix set when output arg ext is not specified
+    """
+    t = TarTeX([sample_tex, "-o", "main"])
+    assert t.tar_file.name == "main.tar"
+
+def test_output_nontar(sample_tex):
+    """
+    Check correct tar file name is set when output arg does have an extension
+    but not one that matches .tar.?z
+    """
+    out = "main.foo.bar" # Output should be "main.foo.bar.tar.XX", not
+                         # "main.foo.tar.XX"
+    t = TarTeX([sample_tex, "-o", out])
+    assert t.tar_file.name == out + ".tar"
+
+def test_output_gz_eqv(sample_tex):
+    """
+    Check that the three kinds of output file names lead to same final tar file
+    """
+    common_opts = [sample_tex, "-o"]
+    out = "main"
+    t1 = TarTeX(common_opts + [out])
+    t2 = TarTeX(common_opts + [out + ".gz"])
+    t3 = TarTeX(common_opts + [out + ".tar.gz"])
+
+    assert t1.tar_file == t2.tar_file
+    assert t2.tar_file == t3.tar_file
+
+def test_tilde_exp(sample_tex):
+    """
+    Check that '~' specified for output arg expands to user home
+    """
+    t = TarTeX([sample_tex, "-o", "~/main.tar.xz"])
+    assert str(t.tar_file) == os.getenv("HOME") + "/main.tar"