diagnostic: add test for IPv6 minimum prefix

src/diagnostic.rs

@@ -720,7 +720,7 @@ impl AnalyzerModule for StyleAnalyzer {
 
 impl StyleAnalyzer {
     /// Analyzes line issues in nftables configuration
-    /// 
+    ///
     /// Detects:
     /// - Lines exceeding maximum length
     /// - Trailing whitespace at end of lines
@@ -768,7 +768,7 @@ impl StyleAnalyzer {
     }
 
     /// Analyzes whitespace issues in nftables configuration
-    /// 
+    ///
     /// Detects:
     /// - Too many consecutive empty lines
     /// - Trailing empty lines at end of file
@@ -935,7 +935,7 @@ impl AnalyzerModule for SemanticAnalyzer {
 
 impl SemanticAnalyzer {
     /// Validates table declarations in nftables configuration
-    /// 
+    ///
     /// Checks for:
     /// - Valid table family (ip, ip6, inet, arp, bridge, netdev)
     /// - Duplicate table names
@@ -1609,5 +1609,14 @@ mod tests {
                 .iter()
                 .any(|d| d.code == DiagnosticCode::InvalidCidrNotation)
         );
+
+        // Test edge case: IPv6 minimum prefix
+        let source_ipv6_zero = "ip6 saddr ::/0 accept";
+        let diagnostics_ipv6_zero = analyzer.validate_cidr_notation(source_ipv6_zero);
+        assert!(
+            !diagnostics_ipv6_zero
+                .iter()
+                .any(|d| d.code == DiagnosticCode::InvalidCidrNotation)
+        );
     }
 }