cstamas commented on code in PR #1694:
URL: https://github.com/apache/maven-resolver/pull/1694#discussion_r2571586014


##########
maven-resolver-impl/src/test/java/org/eclipse/aether/internal/impl/filter/ruletree/GroupTreeTest.java:
##########
@@ -50,5 +50,59 @@ void smoke() {
 
         assertTrue(groupTree.acceptedGroupId("org.apache.baz"));
         assertFalse(groupTree.acceptedGroupId("org.apache.baz.aaa"));
+
+        assertFalse(groupTree.acceptedGroupId("not.in.list.but.uses.default"));
+    }
+
+    @Test
+    void smokeWithPositiveDefault() {
+        GroupTree groupTree = new GroupTree("root");
+        groupTree.loadNodes(Stream.of(
+                "# comment",
+                "",
+                "org.apache.maven",
+                "!=org.apache.maven.foo",
+                "!org.apache.maven.bar",
+                "=org.apache.baz",
+                "*"));
+        assertTrue(groupTree.acceptedGroupId("org.apache.maven"));
+        assertTrue(groupTree.acceptedGroupId("org.apache.maven.aaa"));
+
+        assertFalse(groupTree.acceptedGroupId("org.apache.maven.foo"));
+        assertTrue(groupTree.acceptedGroupId("org.apache.maven.foo.aaa"));
+
+        assertFalse(groupTree.acceptedGroupId("org.apache.maven.bar"));
+        assertFalse(groupTree.acceptedGroupId("org.apache.maven.bar.aaa"));
+
+        assertTrue(groupTree.acceptedGroupId("org.apache.baz"));
+        assertFalse(groupTree.acceptedGroupId("org.apache.baz.aaa"));

Review Comment:
   Nope, is not the `=`... simply, the logic to reject was coded in tree. What 
is needed is "fallback to root allow" and a change to make root always have 
`allow` set (before it was `allow != null && allow`, which is `false` if 
`allow` was `null`), now root `allow` is explicitly set to `false` or flipped 
if `*` present.



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