From b2b0af666f5f798c3fdb7f8e15032d62cc72f612 Mon Sep 17 00:00:00 2001
From: a0666660 <69061030+a0666660@users.noreply.github.com>
Date: Fri, 2 Oct 2026 20:49:23 +0800
Subject: [PATCH] test(ipv6-subnet-calculator): differential suite vs CPython
 ipaddress; fix /128 netmask
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- fix: netmask formula special case was inverted — /128 produced an
  all-zero mask instead of ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
- add 124-case differential fixture generated with CPython ipaddress
  (random 128-bit values x prefix set + classic edge cases), comparing
  expanded/network/first/last/total/netmask against the implementation
---
 ...pv6-subnet-calculator.differential.test.ts |   39 +
 .../ipv6-subnet-calculator.models.ts          |    8 +-
 .../ipv6-subnet-calculator/ipv6.fixture.json  | 1242 +++++++++++++++++
 3 files changed, 1286 insertions(+), 3 deletions(-)
 create mode 100644 src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.differential.test.ts
 create mode 100644 src/tools/ipv6-subnet-calculator/ipv6.fixture.json

diff --git a/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.differential.test.ts b/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.differential.test.ts
new file mode 100644
index 00000000..2d6fcf11
--- /dev/null
+++ b/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.differential.test.ts
@@ -0,0 +1,39 @@
+// Differential test: the IPv6 calculator must agree with Python's `ipaddress`
+// stdlib on 124 random + hand-picked cases (fixture generated by CPython).
+import { readFileSync } from 'node:fs';
+import { describe, expect, it } from 'vitest';
+import { describeIpv6 } from './ipv6-subnet-calculator.models';
+
+interface FixtureCase {
+  input: string
+  expanded: string
+  compressed: string
+  network: string
+  first: string
+  last: string
+  total: string
+  netmask: string
+}
+
+const cases: FixtureCase[] = JSON.parse(
+  readFileSync(new URL('./ipv6.fixture.json', import.meta.url), 'utf8'),
+);
+
+// Python's ipaddress uses lowercase hex for IPv6 str(); my implementation is
+// lowercase per RFC 5952 §4.3 recommendation. Normalize for comparison.
+const lower = (s: string) => s.toLowerCase();
+
+describe('ipv6-subnet-calculator: differential vs CPython ipaddress', () => {
+  it.each(cases.map(c => [c.input, c]))('case %s', (_input, c) => {
+    const info = describeIpv6(c.input);
+    expect(lower(info.expanded)).toBe(lower(c.expanded));
+    // compression: compare the network VALUE (Python may pick a different
+    // zero-run on ties; the address itself must match) plus the prefix
+    expect(lower(info.network.split('/')[0])).toBe(lower(c.network.split('/')[0]));
+    expect(info.network.endsWith(`/${c.network.split('/')[1]}`)).toBe(true);
+    expect(lower(info.firstAddress)).toBe(lower(c.first));
+    expect(lower(info.lastAddress)).toBe(lower(c.last));
+    expect(info.totalAddresses).toBe(c.total);
+    expect(lower(info.mask)).toBe(lower(c.netmask));
+  });
+});
diff --git a/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.models.ts b/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.models.ts
index c0385d6a..b29f9d4f 100644
--- a/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.models.ts
+++ b/src/tools/ipv6-subnet-calculator/ipv6-subnet-calculator.models.ts
@@ -135,12 +135,14 @@ export function describeIpv6(cidr: string): Ipv6Info {
 
   const hostBits = 128 - prefix;
   const networkValue = prefix === 0 ? 0n : (addressValue >> BigInt(hostBits)) << BigInt(hostBits);
-  const total = hostBits >= 0 ? (1n << BigInt(hostBits)) : 0n;
+  const total = 1n << BigInt(hostBits);
   const firstValue = networkValue;
   const lastValue = networkValue + total - 1n;
 
-  const maskHostBits = BigInt(hostBits);
-  const maskValue = hostBits === 0 ? 0n : ((1n << (128n - maskHostBits)) - 1n) << maskHostBits;
+  // Top `prefix` bits set. (2^p - 1) << (128 - p) is exact for every p in
+  // 0..128 — the old special case for hostBits === 0 was inverted and
+  // produced an all-zero netmask for /128 (#differential fixture).
+  const maskValue = ((1n << BigInt(prefix)) - 1n) << BigInt(128 - prefix);
 
   const { type, scope } = describeType(address);
 
diff --git a/src/tools/ipv6-subnet-calculator/ipv6.fixture.json b/src/tools/ipv6-subnet-calculator/ipv6.fixture.json
new file mode 100644
index 00000000..0bba7744
--- /dev/null
+++ b/src/tools/ipv6-subnet-calculator/ipv6.fixture.json
@@ -0,0 +1,1242 @@
+[
+ {
+  "input": "9417:7dc:8770:f0b6:d75d:f7ee:5c1f:aa9f/64",
+  "expanded": "9417:07dc:8770:f0b6:d75d:f7ee:5c1f:aa9f",
+  "compressed": "9417:7dc:8770:f0b6::",
+  "network": "9417:7dc:8770:f0b6::/64",
+  "first": "9417:7dc:8770:f0b6::",
+  "last": "9417:7dc:8770:f0b6:ffff:ffff:ffff:ffff",
+  "total": "18446744073709551616",
+  "netmask": "ffff:ffff:ffff:ffff::"
+ },
+ {
+  "input": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf/128",
+  "expanded": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf",
+  "compressed": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf",
+  "network": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf/128",
+  "first": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf",
+  "last": "d2ed:d018:cbf9:952f:e408:726b:6455:1fdf",
+  "total": "1",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
+ },
+ {
+  "input": "bbb0:d683:c286:c20e:302f:ae0:2661:ddfe/127",
+  "expanded": "bbb0:d683:c286:c20e:302f:0ae0:2661:ddfe",
+  "compressed": "bbb0:d683:c286:c20e:302f:ae0:2661:ddfe",
+  "network": "bbb0:d683:c286:c20e:302f:ae0:2661:ddfe/127",
+  "first": "bbb0:d683:c286:c20e:302f:ae0:2661:ddfe",
+  "last": "bbb0:d683:c286:c20e:302f:ae0:2661:ddff",
+  "total": "2",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe"
+ },
+ {
+  "input": "2fcb:5832:e466:e705:98a:4df0:22e3:f570/128",
+  "expanded": "2fcb:5832:e466:e705:098a:4df0:22e3:f570",
+  "compressed": "2fcb:5832:e466:e705:98a:4df0:22e3:f570",
+  "network": "2fcb:5832:e466:e705:98a:4df0:22e3:f570/128",
+  "first": "2fcb:5832:e466:e705:98a:4df0:22e3:f570",
+  "last": "2fcb:5832:e466:e705:98a:4df0:22e3:f570",
+  "total": "1",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
+ },
+ {
+  "input": "9091:3a1f:3106:4483:572d:2d7e:36bf:7fec/96",
+  "expanded": "9091:3a1f:3106:4483:572d:2d7e:36bf:7fec",
+  "compressed": "9091:3a1f:3106:4483:572d:2d7e::",
+  "network": "9091:3a1f:3106:4483:572d:2d7e::/96",
+  "first": "9091:3a1f:3106:4483:572d:2d7e::",
+  "last": "9091:3a1f:3106:4483:572d:2d7e:ffff:ffff",
+  "total": "4294967296",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff::"
+ },
+ {
+  "input": "ce0b:d65b:6406:d27d:d0c9:5e2c:411b:ff12/48",
+  "expanded": "ce0b:d65b:6406:d27d:d0c9:5e2c:411b:ff12",
+  "compressed": "ce0b:d65b:6406::",
+  "network": "ce0b:d65b:6406::/48",
+  "first": "ce0b:d65b:6406::",
+  "last": "ce0b:d65b:6406:ffff:ffff:ffff:ffff:ffff",
+  "total": "1208925819614629174706176",
+  "netmask": "ffff:ffff:ffff::"
+ },
+ {
+  "input": "3b22:e7de:dc4b:cc23:697:b18c:5006:e38/32",
+  "expanded": "3b22:e7de:dc4b:cc23:0697:b18c:5006:0e38",
+  "compressed": "3b22:e7de::",
+  "network": "3b22:e7de::/32",
+  "first": "3b22:e7de::",
+  "last": "3b22:e7de:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "79228162514264337593543950336",
+  "netmask": "ffff:ffff::"
+ },
+ {
+  "input": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f1bb/120",
+  "expanded": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f1bb",
+  "compressed": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f100",
+  "network": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f100/120",
+  "first": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f100",
+  "last": "7ad9:3428:4356:2f72:bf9b:4438:3f98:f1ff",
+  "total": "256",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00"
+ },
+ {
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+  "expanded": "b213:3a63:80f9:1ecf:6362:8ff7:5c31:d441",
+  "compressed": "b213::",
+  "network": "b213::/16",
+  "first": "b213::",
+  "last": "b213:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "5192296858534827628530496329220096",
+  "netmask": "ffff::"
+ },
+ {
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+  "expanded": "9780:2716:63b2:5992:7314:4f18:0e87:7968",
+  "compressed": "9780:2716:63b2:5992:7314:4f18:e80:0",
+  "network": "9780:2716:63b2:5992:7314:4f18:e80:0/105",
+  "first": "9780:2716:63b2:5992:7314:4f18:e80:0",
+  "last": "9780:2716:63b2:5992:7314:4f18:eff:ffff",
+  "total": "8388608",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ff80:0"
+ },
+ {
+  "input": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:1554/112",
+  "expanded": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:1554",
+  "compressed": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:0",
+  "network": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:0/112",
+  "first": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:0",
+  "last": "ad4f:23b9:d437:df60:1b91:e6b0:1f49:ffff",
+  "total": "65536",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:0"
+ },
+ {
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+  "expanded": "6c5f:e71b:2d0a:056c:ffc8:3d74:61ad:5f4b",
+  "compressed": "6c5f:e71b:2d0a:56c:ffc8:3d74:61ad:0",
+  "network": "6c5f:e71b:2d0a:56c:ffc8:3d74:61ad:0/112",
+  "first": "6c5f:e71b:2d0a:56c:ffc8:3d74:61ad:0",
+  "last": "6c5f:e71b:2d0a:56c:ffc8:3d74:61ad:ffff",
+  "total": "65536",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:0"
+ },
+ {
+  "input": "48ed:81e7:86ba:40f1:ba9b:6711:a1e3:e16/16",
+  "expanded": "48ed:81e7:86ba:40f1:ba9b:6711:a1e3:0e16",
+  "compressed": "48ed::",
+  "network": "48ed::/16",
+  "first": "48ed::",
+  "last": "48ed:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "5192296858534827628530496329220096",
+  "netmask": "ffff::"
+ },
+ {
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+  "expanded": "e555:9766:f57c:b482:042a:39bb:71a3:4991",
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+  "last": "e555:9766:f57c:b482:42a:39bb:71a3:ffff",
+  "total": "65536",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:0"
+ },
+ {
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+  "expanded": "abc2:4062:f12b:e2a9:7035:85e3:3da9:4211",
+  "compressed": "abc2:4062:f12b:e2a9:7035:85e3:3da9:4210",
+  "network": "abc2:4062:f12b:e2a9:7035:85e3:3da9:4210/127",
+  "first": "abc2:4062:f12b:e2a9:7035:85e3:3da9:4210",
+  "last": "abc2:4062:f12b:e2a9:7035:85e3:3da9:4211",
+  "total": "2",
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+ },
+ {
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+  "expanded": "bbd2:aef0:794c:6dcc:2215:207b:73ad:86d2",
+  "compressed": "bbd2:aef0:794c:6dcc:2215:207b:73ad:8600",
+  "network": "bbd2:aef0:794c:6dcc:2215:207b:73ad:8600/120",
+  "first": "bbd2:aef0:794c:6dcc:2215:207b:73ad:8600",
+  "last": "bbd2:aef0:794c:6dcc:2215:207b:73ad:86ff",
+  "total": "256",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00"
+ },
+ {
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+  "expanded": "178d:1501:3f49:b96b:3907:7d6a:94fc:0f4a",
+  "compressed": "178d:1501:3f49::",
+  "network": "178d:1501:3f49::/48",
+  "first": "178d:1501:3f49::",
+  "last": "178d:1501:3f49:ffff:ffff:ffff:ffff:ffff",
+  "total": "1208925819614629174706176",
+  "netmask": "ffff:ffff:ffff::"
+ },
+ {
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+  "expanded": "54eb:2a62:91a8:9407:0d20:e53b:358f:bdc1",
+  "compressed": "54eb:2a62::",
+  "network": "54eb:2a62::/32",
+  "first": "54eb:2a62::",
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+  "total": "79228162514264337593543950336",
+  "netmask": "ffff:ffff::"
+ },
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+  "expanded": "5ec4:90ff:1d67:7adb:ff67:a2f0:7025:e6b3",
+  "compressed": "5ec4:90ff::",
+  "network": "5ec4:90ff::/32",
+  "first": "5ec4:90ff::",
+  "last": "5ec4:90ff:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "79228162514264337593543950336",
+  "netmask": "ffff:ffff::"
+ },
+ {
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+  "expanded": "25e7:2d19:14de:0550:a739:d0a9:c49e:0d36",
+  "compressed": "25e7:2d19:14de:550:a739:d0a9:c49e:d36",
+  "network": "25e7:2d19:14de:550:a739:d0a9:c49e:d36/127",
+  "first": "25e7:2d19:14de:550:a739:d0a9:c49e:d36",
+  "last": "25e7:2d19:14de:550:a739:d0a9:c49e:d37",
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+ },
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+  "first": "faff:5682:776e:b9f9:a6e1:e81:d2bf:0",
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+  "total": "65536",
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+ },
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+  "expanded": "8977:335b:43d1:494f:7fca:59fa:5f46:c048",
+  "compressed": "8977:335b:43d1:494f:7fca:59fa:5f46:c000",
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+  "network": "77be:3105:c3c:2a77::/64",
+  "first": "77be:3105:c3c:2a77::",
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+ },
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+  "compressed": "82cb:c6bb::",
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+  "first": "82cb:c6bb::",
+  "last": "82cb:c6bb:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "79228162514264337593543950336",
+  "netmask": "ffff:ffff::"
+ },
+ {
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+  "expanded": "3bd3:d84f:11ca:205b:21cd:3df5:72eb:411b",
+  "compressed": "3bd3:d84f:11ca:205b:21cd:3df5::",
+  "network": "3bd3:d84f:11ca:205b:21cd:3df5::/96",
+  "first": "3bd3:d84f:11ca:205b:21cd:3df5::",
+  "last": "3bd3:d84f:11ca:205b:21cd:3df5:ffff:ffff",
+  "total": "4294967296",
+  "netmask": "ffff:ffff:ffff:ffff:ffff:ffff::"
+ },
+ {
+  "input": "b07d:e339:fcf6:3f58:ccc8:c0c3:7843:5b2d/16",
+  "expanded": "b07d:e339:fcf6:3f58:ccc8:c0c3:7843:5b2d",
+  "compressed": "b07d::",
+  "network": "b07d::/16",
+  "first": "b07d::",
+  "last": "b07d:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+  "total": "5192296858534827628530496329220096",
+  "netmask": "ffff::"
+ },
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\ No newline at end of file