TST: deactivated zip file test for outdated eln and added simple zip test

unittests/test_zipfile_converter.py

@@ -50,6 +50,12 @@ def converter_registry():
     return converter_registry
 
 
+@pytest.mark.xfail(
+    reason="The example files for PASTA have not yet been updated in:"
+    "https://github.com/TheELNConsortium/TheELNFileFormat/tree/master/examples/PASTA"
+    "However, there was the announcement that these files are going to follow the"
+    "flattened structure soon: https://github.com/TheELNConsortium/TheELNFileFormat/issues/98"
+)
 def test_zipfile_converter(converter_registry):
     zipfile = File("PASTA.eln", os.path.join(UNITTESTDIR, "eln_files", "PASTA.eln"))
     zip_conv = ZipFileConverter(yaml.safe_load("""
@@ -77,3 +83,29 @@ match: ^PASTA$
         assert isinstance(children[i], Directory)
     for i in range(2, 5):
         assert isinstance(children[i], File)
+
+
+def test_zipfile_minimal(converter_registry):
+    zipfile = File("empty.zip", os.path.join(UNITTESTDIR, "zip_minimal", "empty.zip"))
+    zip_conv = ZipFileConverter(yaml.safe_load("""
+type: ZipFile
+match: .*$
+"""), "TestZipFileConverter", converter_registry)
+
+    match = zip_conv.match(zipfile)
+    assert match is not None
+
+    children = zip_conv.create_children(GeneralStore(), zipfile)
+    assert len(children) == 2
+    assert children[1].name == "empty.txt"
+
+    dir_conv = DirectoryConverter(yaml.safe_load("""
+type: Directory
+match: ^folder$
+"""), "TestDirectory", converter_registry)
+    match = dir_conv.match(children[0])
+    assert match is not None
+    children = dir_conv.create_children(GeneralStore(), children[0])
+    assert len(children) == 3
+    for i in range(3):
+        assert isinstance(children[i], File)