Update testing documentation and improve test structure

tests/test_license_processor.py

@@ -0,0 +1,62 @@
+import pytest
+from doi2dataset import LicenseProcessor, License
+
+def test_license_processor_cc_by():
+    """Test processing a CC BY license"""
+    data = {
+        "primary_location": {
+            "license": "cc-by"
+        }
+    }
+    license_obj = LicenseProcessor.process_license(data)
+    assert isinstance(license_obj, License)
+    assert license_obj.short == "cc-by"
+    assert license_obj.name == "CC BY 4.0"
+    assert license_obj.uri == "https://creativecommons.org/licenses/by/4.0/"
+
+def test_license_processor_cc0():
+    """Test processing a CC0 license"""
+    data = {
+        "primary_location": {
+            "license": "cc0"
+        }
+    }
+    license_obj = LicenseProcessor.process_license(data)
+    assert isinstance(license_obj, License)
+    assert license_obj.short == "cc0"
+    assert license_obj.name == "CC0 1.0"
+    assert license_obj.uri == "https://creativecommons.org/publicdomain/zero/1.0/"
+
+def test_license_processor_unknown_license():
+    """Test processing an unknown license"""
+    data = {
+        "primary_location": {
+            "license": "unknown-license"
+        }
+    }
+    license_obj = LicenseProcessor.process_license(data)
+    assert isinstance(license_obj, License)
+    assert license_obj.short == "unknown-license"
+    # Verify properties exist and have expected values based on implementation
+    assert license_obj.name == "unknown-license" or license_obj.name == ""
+    assert hasattr(license_obj, "uri")
+
+def test_license_processor_no_license():
+    """Test processing with no license information"""
+    data = {
+        "primary_location": {}
+    }
+    license_obj = LicenseProcessor.process_license(data)
+    assert isinstance(license_obj, License)
+    assert license_obj.short == "unknown"
+    assert license_obj.name == ""
+    assert license_obj.uri == ""
+
+def test_license_processor_no_primary_location():
+    """Test processing with no primary location"""
+    data = {}
+    license_obj = LicenseProcessor.process_license(data)
+    assert isinstance(license_obj, License)
+    assert license_obj.short == "unknown"
+    assert license_obj.name == ""
+    assert license_obj.uri == ""