Preserve case and quoted spaces in dependency requirements

Signed-off-by: Ali Zulfiqar <codewithfourtix@gmail.com>

Author: codewithfourtix

src/python_inspector/dependencies.py

@@ -65,7 +65,7 @@ def get_dependency(specifier) -> DependentPackage:
     >>> dep = get_dependency("foo==1.2.3")
     >>> assert dep.purl == "pkg:pypi/foo@1.2.3"
     """
-    specifier = specifier and "".join(specifier.lower().split())
+    specifier = specifier and specifier.strip()
     assert specifier, f"specifier is required but empty:{specifier!r}"
 
     requirement = Requirement(requirement_string=specifier)

tests/test_requirement_text.py

@@ -0,0 +1,12 @@
+import pytest
+
+from python_inspector.dependencies import get_dependency
+
+@pytest.mark.parametrize(
+    "text",
+    ['Demo==1.2; sys_platform == "Windows Server"', "Demo @ https://example.org/Release/Demo.whl"],
+)
+def test_dependency_preserves_requirement_text(text):
+    dependency = get_dependency("  " + text + "  ")
+    assert dependency.extracted_requirement == text
+    assert dependency.purl.startswith("pkg:pypi/demo")