conf: fix undefined variable and improve test coverage

rust2rpm/conf.py

@@ -38,15 +38,15 @@ class Rust2RpmConf:
         conf = configparser.ConfigParser(interpolation=configparser.ExtendedInterpolation())
         confs = conf.read(filenames)
 
-        if len(confs) > 1:
+        if len(confs) > 1:  # pragma nocover
             raise FileExistsError
 
         # clean up configuration files with deprecated names
-        if ".rust2rpm.conf" in confs:
+        if ".rust2rpm.conf" in confs:  # pragma nocover
             os.rename(".rust2rpm.conf", "rust2rpm.conf")
             log.info("Renamed deprecated, hidden .rust2rpm.conf file to rust2rpm.conf.")
 
-        if "_rust2rpm.conf" in confs:
+        if "_rust2rpm.conf" in confs:  # pragma nocover
             os.rename("_rust2rpm.conf", "rust2rpm.conf")
             log.info("Renamed deprecated _rust2rpm.conf file to rust2rpm.conf.")
 
@@ -81,7 +81,8 @@ class Rust2RpmConf:
         # parse configuration and validate settings
         settings = dict()
 
-        if all_features := merged.getboolean("all-features") and all_features is not None:
+        all_features = merged.getboolean("all-features")
+        if all_features is not None:
             settings["all_features"] = all_features
 
         if unwanted_features := merged.get("unwanted-features"):

rust2rpm/metadata.py

@@ -39,7 +39,7 @@ def guess_main_package(metadata: Metadata, hint: Optional[str] = None, interacti
     if len(with_bin) == 1:
         return with_bin[0]
 
-    if interactive:
+    if interactive:  # pragma nocover
         choices = [package.name for package in with_bin] + [package.name for package in with_cdylib]
         log.warn(
             'Heuristic for determining the "main" crate of the workspace failed. '

rust2rpm/tests/samples/chrono-0.4.23.rust2rpm.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+all-features = true
+unwanted-features =
+  __doctest

rust2rpm/tests/test_conf.py

@@ -9,6 +9,16 @@ from rust2rpm.conf import Rust2RpmConf
 @pytest.mark.parametrize(
     "filename,features,all_features,unwanted_features,buildrequires,testrequires,bin_requires,lib_requires",
     [
+        (
+            "chrono-0.4.23.rust2rpm.conf",
+            {"__doctest"},
+            True,
+            ["__doctest"],
+            list(),
+            list(),
+            list(),
+            dict(),
+        ),
         (
             "libsqlite3-sys-0.25.2.rust2rpm.conf",
             {"sqlcipher"},