Squash some PITest mutants

Author: jqno

equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/reflection/PackageScanner.java

@@ -62,7 +62,7 @@ private static Stream<File> processResource(URL resource, String packagePath, Pa
         return rethrow(() -> switch (resource.toURI().getScheme()) {
             case "file" -> processDirectory(resource, options.scanRecursively());
             case "jar" -> options.ignoreExternalJars()
-                    ? Stream.of()
+                    ? Stream.empty()
                     : walkJar(resource, packagePath, options.scanRecursively());
             default -> throw new ReflectionException(
                     "Could not resolve " + resource.toURI().getScheme() + " resource " + resource);
@@ -76,7 +76,7 @@ private static Stream<File> processDirectory(URL resource, boolean scanRecursive
 
     private static Stream<File> walkDirectory(File dir, boolean scanRecursively) {
         if (!dir.exists()) {
-            return Stream.of();
+            return Stream.empty();
         }
         return Arrays
                 .stream(dir.listFiles())

equalsverifier-core/src/test/java/nl/jqno/equalsverifier/internal/reflection/PackageScannerTest.java

@@ -152,6 +152,14 @@ void jarPackageWithIgnore() {
         assertThat(classes).isEmpty();
     }
 
+    @Test
+    void jarPackageDontReturnEntireJar() {
+        List<Class<?>> classes = PackageScanner.getClassesIn("org.objenesis.instantiator", opts);
+        assertThat(classes)
+                .noneMatch(c -> "org.objenesis.Objenesis".equals(c.getName()))
+                .anyMatch(c -> "org.objenesis.instantiator.ObjectInstantiator".equals(c.getName()));
+    }
+
     private void sort(List<Class<?>> classes) {
         classes.sort(Comparator.comparing(Class::getName));
     }