feat: add !paste command and unit tests for 5 core plugins

Add cmd_paste to flaskpaste plugin (create paste, return URL).
Add test suites for encode, hash, defang, cidr, and dns plugins
(83 new test cases, 1093 total).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_cidr.py

@@ -0,0 +1,136 @@
+"""Tests for the CIDR calculator plugin."""
+
+import asyncio
+import importlib.util
+import sys
+from pathlib import Path
+
+from derp.irc import Message
+
+# plugins/ is not a Python package -- load the module from file path
+_spec = importlib.util.spec_from_file_location(
+    "plugins.cidr", Path(__file__).resolve().parent.parent / "plugins" / "cidr.py",
+)
+_mod = importlib.util.module_from_spec(_spec)
+sys.modules[_spec.name] = _mod
+_spec.loader.exec_module(_mod)
+
+from plugins.cidr import cmd_cidr  # noqa: E402
+
+# -- Helpers -----------------------------------------------------------------
+
+class _FakeBot:
+    def __init__(self):
+        self.replied: list[str] = []
+
+    async def reply(self, message, text: str) -> None:
+        self.replied.append(text)
+
+
+def _msg(text: str) -> Message:
+    return Message(
+        raw="", prefix="alice!~alice@host", nick="alice",
+        command="PRIVMSG", params=["#test", text], tags={},
+    )
+
+
+# -- Info: IPv4 --------------------------------------------------------------
+
+class TestCidrInfoIPv4:
+    def test_slash24(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 192.168.1.0/24")))
+        reply = bot.replied[0]
+        assert "net:192.168.1.0/24" in reply
+        assert "hosts:254" in reply
+        assert "mask:255.255.255.0" in reply
+        assert "broadcast:192.168.1.255" in reply
+
+    def test_slash31_no_broadcast(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 10.0.0.0/31")))
+        reply = bot.replied[0]
+        assert "hosts:2" in reply
+        assert "broadcast" not in reply
+
+    def test_slash32(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 10.0.0.1/32")))
+        reply = bot.replied[0]
+        assert "hosts:1" in reply
+        assert "broadcast" not in reply
+
+    def test_range(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 10.0.0.0/30")))
+        reply = bot.replied[0]
+        assert "range:10.0.0.0-10.0.0.3" in reply
+        assert "hosts:2" in reply
+
+    def test_wildcard(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 172.16.0.0/16")))
+        reply = bot.replied[0]
+        assert "wildcard:0.0.255.255" in reply
+
+
+# -- Info: IPv6 --------------------------------------------------------------
+
+class TestCidrInfoIPv6:
+    def test_ipv6_slash64(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr 2001:db8::/64")))
+        reply = bot.replied[0]
+        assert "net:2001:db8::/64" in reply
+        assert "hosts:" in reply
+        # No mask/wildcard/broadcast for IPv6
+        assert "mask:" not in reply
+
+    def test_ipv6_slash128(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr ::1/128")))
+        reply = bot.replied[0]
+        assert "hosts:1" in reply
+
+
+# -- Contains ----------------------------------------------------------------
+
+class TestCidrContains:
+    def test_ip_in_network(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr contains 10.0.0.0/8 10.1.2.3")))
+        assert "is in" in bot.replied[0]
+
+    def test_ip_not_in_network(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr contains 10.0.0.0/8 192.168.1.1")))
+        assert "NOT in" in bot.replied[0]
+
+    def test_invalid_network(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr contains badnet 10.0.0.1")))
+        assert "Invalid network" in bot.replied[0]
+
+    def test_invalid_ip(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr contains 10.0.0.0/8 notanip")))
+        assert "Invalid IP" in bot.replied[0]
+
+    def test_missing_args(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr contains 10.0.0.0/8")))
+        assert "Usage" in bot.replied[0]
+
+
+# -- Errors ------------------------------------------------------------------
+
+class TestCidrErrors:
+    def test_invalid_network(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr notanetwork")))
+        assert "Invalid network" in bot.replied[0]
+
+    def test_missing_args(self):
+        bot = _FakeBot()
+        asyncio.run(cmd_cidr(bot, _msg("!cidr")))
+        assert "Usage" in bot.replied[0]