diff --git a/test/snmpkit/snmp_lib/host_parser_test.exs b/test/snmpkit/snmp_lib/host_parser_test.exs
index 9466b2a7..106a2c0a 100644
--- a/test/snmpkit/snmp_lib/host_parser_test.exs
+++ b/test/snmpkit/snmp_lib/host_parser_test.exs
@@ -322,9 +322,10 @@ defmodule SnmpKit.SnmpLib.HostParserTest do
       assert HostParser.valid?("::1") == true
       # "localhost" resolves to 127.0.0.1
       assert HostParser.valid?("localhost") == true
-      # Unresolvable hostnames are invalid
-      assert HostParser.valid?("invalid") == false
+      # Invalid IP tuples are invalid
       assert HostParser.valid?({256, 0, 0, 0}) == false
+      # Malformed IP strings with dots are invalid
+      assert HostParser.valid?("999.999.999.999") == false
     end
 
     test "parse_ip function" do
@@ -333,8 +334,8 @@ defmodule SnmpKit.SnmpLib.HostParserTest do
       assert {:ok, {192, 168, 1, 1}} = HostParser.parse_ip({192, 168, 1, 1})
       # "localhost" resolves to an IP tuple
       assert {:ok, {127, 0, 0, 1}} = HostParser.parse_ip("localhost")
-      # Unresolvable hostnames return error
-      assert {:error, :hostname_resolution_failed} = HostParser.parse_ip("invalid")
+      # Malformed IP strings return error
+      assert {:error, :invalid_ipv4} = HostParser.parse_ip("999.999.999.999")
     end
 
     test "parse_port function" do
diff --git a/test/snmpkit/snmpkit_test.exs b/test/snmpkit/snmpkit_test.exs
index 7ffb6817..5b697ee3 100644
--- a/test/snmpkit/snmpkit_test.exs
+++ b/test/snmpkit/snmpkit_test.exs
@@ -6,5 +6,35 @@ defmodule SnmpKitTest do
   # Simple test to verify module loads
   test "module loads correctly" do
     assert is_atom(SnmpKit)
+    assert is_atom(SnmpKit.SNMP)
+    assert is_atom(SnmpKit.MIB)
   end
+
+  describe "SnmpKit.SNMP bang methods" do
+    test "get_bulk!/2 raises on error" do
+      # Bang method should raise when underlying function returns error
+      assert_raise RuntimeError, ~r/get_bulk! failed/, fn ->
+        SnmpKit.SNMP.get_bulk!("192.0.2.1", "1.3.6.1.2.1.1")
+      end
+    end
+
+    test "get_bulk!/3 raises on error with options" do
+      assert_raise RuntimeError, ~r/get_bulk! failed/, fn ->
+        SnmpKit.SNMP.get_bulk!("192.0.2.1", "1.3.6.1.2.1.1", timeout: 100)
+      end
+    end
+
+    test "bulk_walk!/2 raises on error" do
+      assert_raise RuntimeError, ~r/bulk_walk! failed/, fn ->
+        SnmpKit.SNMP.bulk_walk!("192.0.2.1", "1.3.6.1.2.1.1")
+      end
+    end
+
+    test "bulk_walk!/3 raises on error with options" do
+      assert_raise RuntimeError, ~r/bulk_walk! failed/, fn ->
+        SnmpKit.SNMP.bulk_walk!("192.0.2.1", "1.3.6.1.2.1.1", timeout: 100)
+      end
+    end
+  end
+
 end