fix: resolve typing violation and ETS cache race in tests

- Use pattern match assertion in towerops_native_test to satisfy type checker
- Clear ETS whitelist cache in brute_force_test setup to prevent cross-test leakage

test/towerops/security/brute_force_test.exs

@@ -4,6 +4,19 @@ defmodule Towerops.Security.BruteForceTest do
   alias Towerops.Security.BruteForce
   alias Towerops.Security.IpBlock
 
+  setup do
+    # Clear the global ETS whitelist cache so each test gets a fresh load
+    # from its own Ecto sandbox. Without this, stale entries from other
+    # async test processes can leak through the shared cache.
+    try do
+      :ets.delete(:brute_force_whitelist_cache)
+    rescue
+      ArgumentError -> :ok
+    end
+
+    :ok
+  end
+
   describe "whitelist management" do
     test "check_whitelist/1 returns false for non-whitelisted IP" do
       refute BruteForce.check_whitelist("192.168.1.100")

test/towerops_native_test.exs

@@ -104,14 +104,8 @@ defmodule ToweropsNativeTest do
 
     test "handles MODULE::name format" do
       # net-snmp natively supports MODULE::name format
-      oid1 = ToweropsNative.resolve_oid("SNMPv2-MIB::sysDescr")
-      oid2 = ToweropsNative.resolve_oid("sysDescr")
-
-      # Both should resolve to the same OID (dialyzer can't infer these always succeed)
-      assert is_binary(oid1)
-      assert is_binary(oid2)
-      assert oid1 == oid2
-      assert oid1 == "1.3.6.1.2.1.1.1"
+      assert "1.3.6.1.2.1.1.1" = ToweropsNative.resolve_oid("SNMPv2-MIB::sysDescr")
+      assert "1.3.6.1.2.1.1.1" = ToweropsNative.resolve_oid("sysDescr")
     end
 
     test "returns error tuple for invalid MIB names" do