fix: try to have boa read the filename as the contract name

boa/interpret.py

@@ -239,8 +239,16 @@ def loads_partial(
     dedent: bool = True,
     compiler_args: dict = None,
 ) -> VyperDeployer:
-    name = name or "VyperContract"
-    filename = filename or "<unknown>"
+    if filename is None:
+        filename = "<unknown>"
+
+    if name is None:
+        if isinstance(filename, Path) or (
+            isinstance(filename, str) and filename != "<unknown>"
+        ):
+            name = Path(filename).stem
+        else:
+            name = "VyperContract"
 
     if dedent:
         source_code = textwrap.dedent(source_code)

tests/unitary/contracts/vyper/test_vyper_contract.py

@@ -87,5 +87,15 @@ def foo() -> bool:
 
     c = boa.loads(code, filename="a/b/return_one.vy")
 
-    assert c.contract_name == "VyperContract"
+    assert c.contract_name == "return_one"
     assert c.filename == "a/b/return_one.vy"
+
+    c = boa.loads(code, filename=None, name="dummy_name")
+
+    assert c.contract_name == "dummy_name"
+    assert c.filename == "<unknown>"
+
+    c = boa.loads(code, filename=None, name=None)
+
+    assert c.contract_name == "VyperContract"
+    assert c.filename == "<unknown>"