Fix file installation for wheels with no Requires-Dist (#1322)

poetry/utils/inspector.py

@@ -49,7 +49,7 @@ class Inspector:
             "version": "",
             "summary": "",
             "requires_python": None,
-            "requires_dist": None,
+            "requires_dist": [],
         }
 
         try:

tests/installation/fixtures/with-wheel-dependency-no-requires-dist.test

+[[package]]
+name = "demo"
+version = "0.1.0"
+description = ""
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.source]
+type = "file"
+reference = ""
+url = "tests/fixtures/wheel_with_no_requires_dist/demo-0.1.0-py2.py3-none-any.whl"
+
+[metadata]
+python-versions = "*"
+content-hash = "123456789"
+
+[metadata.hashes]
+demo = ["c25eb81459126848a1788eb3520d1a32014eb51ce3d3bae88c56bfdde4ce02db"]

tests/installation/test_installer.py

@@ -677,6 +677,21 @@ def test_run_installs_with_local_file(installer, locker, repo, package):
     assert len(installer.installer.installs) == 2
 
 
+def test_run_installs_wheel_with_no_requires_dist(installer, locker, repo, package):
+    file_path = Path(
+        "tests/fixtures/wheel_with_no_requires_dist/demo-0.1.0-py2.py3-none-any.whl"
+    )
+    package.add_dependency("demo", {"file": str(file_path)})
+
+    installer.run()
+
+    expected = fixture("with-wheel-dependency-no-requires-dist")
+
+    assert locker.written_data == expected
+
+    assert len(installer.installer.installs) == 1
+
+
 def test_run_installs_with_local_poetry_directory_and_extras(
     installer, locker, repo, package, tmpdir
 ):