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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+//
+// [#8074] The arming guard is SHOWN TO FIRE — in both directions, on real boots.
+//
+// This file exists because of what it guards. `assertArmed` is a mechanism for
+// catching assertions that cannot fail; a version of it that could not itself
+// fail would be the defect wearing the fix's clothes, and it would be invisible
+// in exactly the same way (green, quiet, reported as tested).
+//
+// So every probe is measured twice, and the disarmed halves are not synthetic:
+//
+//   principalArmed    DISARMED on an org-LESS boot — a live reproduction of
+//                     #8023, where a fresh sign-up holds `['everyone']` and the
+//                     `org_member`-gated write floor never applies
+//                     ARMED on `bootStack(..., { orgContext: true })`
+//   authSettingArmed  DISARMED on the default auth config — a live reproduction
+//                     of #8049, where `passwordHistoryCount` is 0/undefined and
+//                     the reuse control has nothing to reject against
+//                     ARMED after the `applyConfigPatch` the fixture uses
+//   seededArmed       DISARMED on a permission set that does not exist
+//                     ARMED on `member_default`, which does
+//   armedWhen         DISARMED / ARMED on both sides of its own predicate
+//
+// The `member_default` case is not decoration: it is the control that proves
+// the seeded-row probe CAN find something, so its negative reading is a real
+// negative rather than a probe that never matches anything.
+//
+// Two positive controls guard the "it throws" cases from the cheapest possible
+// fake — an `assertArmed` that always threw would satisfy every rejection
+// assertion here, so an all-armed declaration is asserted to RESOLVE.
+//
+// Boots two stacks, uses custom boot options and mutates auth config, so it
+// stays out of `SHARED_SHOWCASE` (see `vitest.config.ts`).
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import showcaseStack from '@objectstack/example-showcase';
+import { bootStack, type VerifyStack } from '@objectstack/verify';
+import {
+  assertArmed,
+  armedWhen,
+  authSettingArmed,
+  principalArmed,
+  resolveAuthzFor,
+  seededArmed,
+  type ArmingProbe,
+} from './armed.js';
+
+/** The control #8023's fixture measures, named the way that card names it. */
+const WRITE_FLOOR = 'the wildcard row-level write floor (`owner_only_writes`)';
+const WRITE_FLOOR_DISARM =
+  'an org-less boot: no organization ⇒ no `sys_member` row ⇒ the principal never holds ' +
+  '`org_member` ⇒ the positions-gated floor never applies. Boot with `orgContext: true`.';
+
+/** The control #8049's fixture measures. */
+const REUSE_CONTROL = "ADR-0069 D1's password-reuse rejection";
+const REUSE_DISARM =
+  '`passwordHistoryCount` defaults to 0 (off): no history is recorded, so a reuse assertion ' +
+  'has nothing to reject against. Arm it through `applyConfigPatch`.';
+
+describe('[#8074] assertArmed: the guard against assertions that cannot fail', () => {
+  /** The org-LESS stack — #8023's and #8049's disarmed shapes, booted for real. */
+  let orgless: VerifyStack;
+  /** The org-BOUND stack — the same probe, armed. */
+  let orgbound: VerifyStack;
+
+  let orglessMember: string;
+  let orgboundMember: string;
+
+  beforeAll(async () => {
+    orgless = await bootStack(showcaseStack, {});
+    orgbound = await bootStack(showcaseStack, { orgContext: true });
+
+    // The first user is the seeded dev admin; a fresh sign-up is the plain
+    // member #8023's fixture measures.
+    await orgless.signIn();
+    await orgbound.signIn();
+    orglessMember = await orgless.signUp('armed-orgless@verify.test');
+    orgboundMember = await orgbound.signUp('armed-orgbound@verify.test');
+  }, 300_000);
+
+  afterAll(async () => {
+    await orgless?.stop?.();
+    await orgbound?.stop?.();
+  });
+
+  // ── the fixture's own integrity ───────────────────────────────────────────
+  //
+  // Every reading below is worthless if the two stacks are not actually the two
+  // shapes they are named for, so that is asserted before anything is measured.
+
+  it('[integrity] the two stacks really are the org-less and org-bound shapes', async () => {
+    const less = await resolveAuthzFor(orgless, orglessMember);
+    const bound = await resolveAuthzFor(orgbound, orgboundMember);
+    expect(less.userId, 'the org-less member resolved as a real principal').toBeTruthy();
+    expect(bound.userId, 'the org-bound member resolved as a real principal').toBeTruthy();
+    expect(less.positions, 'org-less: a fresh sign-up holds only the everyone anchor')
+      .not.toContain('org_member');
+    expect(bound.positions, 'org-bound: the membership reconciler bound the sign-up')
+      .toContain('org_member');
+  });
+
+  // ── principalArmed — instance 1, both directions ──────────────────────────
+
+  describe('principalArmed reproduces #8023 and reports it', () => {
+    const probeOn = (stack: VerifyStack, token: string): ArmingProbe =>
+      principalArmed({
+        stack,
+        token,
+        who: 'the plain member',
+        positions: ['org_member'],
+        control: WRITE_FLOOR,
+        disarmedBy: WRITE_FLOOR_DISARM,
+      });
+
+    it('reports DISARMED on an org-less boot, and names what it saw', async () => {
+      const verdict = await probeOn(orgless, orglessMember).read();
+      expect(verdict.armed, 'org-less: the floor is outside this principal’s domain').toBe(false);
+      expect(verdict.observed).toContain('missing positions');
+      expect(verdict.observed).toContain('org_member');
+    });
+
+    it('reports ARMED on `orgContext: true` — the same probe, the other direction', async () => {
+      const verdict = await probeOn(orgbound, orgboundMember).read();
+      expect(verdict.armed, 'org-bound: the principal is inside the floor’s domain').toBe(true);
+      expect(verdict.observed).toContain('org_member');
+    });
+
+    it('assertArmed REJECTS the disarmed stack, naming the control and the default', async () => {
+      await expect(assertArmed([probeOn(orgless, orglessMember)])).rejects.toThrow(
+        /this fixture is DISARMED/,
+      );
+      const err = await assertArmed([probeOn(orgless, orglessMember)]).catch((e: Error) => e);
+      expect(String(err)).toContain(WRITE_FLOOR);
+      // The remedy, not just the symptom — the sentence the next author needs.
+      expect(String(err)).toContain('orgContext: true');
+    });
+
+    it('[positive control] assertArmed RESOLVES on the armed stack', async () => {
+      // Without this, every rejection assertion above would be satisfied by an
+      // `assertArmed` that simply always threw.
+      await expect(assertArmed([probeOn(orgbound, orgboundMember)])).resolves.toBeUndefined();
+    });
+
+    it('a principal that resolves to nothing is DISARMED, not skipped', async () => {
+      const verdict = await principalArmed({
+        stack: orgbound,
+        token: 'not-a-token-8074',
+        who: 'a bogus credential',
+        positions: ['org_member'],
+        control: WRITE_FLOOR,
+        disarmedBy: WRITE_FLOOR_DISARM,
+      }).read();
+      expect(verdict.armed).toBe(false);
+      expect(verdict.observed).toContain('missing positions');
+    });
+  });
+
+  // ── authSettingArmed — instance 2, both directions ────────────────────────
+
+  describe('authSettingArmed reproduces #8049 and reports it', () => {
+    const probe = (stack: VerifyStack): ArmingProbe =>
+      authSettingArmed({
+        stack,
+        setting: 'passwordHistoryCount',
+        armed: (v) => Number(v) >= 1,
+        control: REUSE_CONTROL,
+        disarmedBy: REUSE_DISARM,
+      });
+
+    it('reads DISARMED by default and ARMED after the patch the fixture uses', async () => {
+      // Read the default FIRST, then arm, then restore — so this case is
+      // atomic and cannot depend on the order vitest runs the file in.
+      const before = await probe(orgless).read();
+      expect(before.armed, 'the platform default leaves the reuse control off').toBe(false);
+      expect(before.observed).toContain('passwordHistoryCount=');
+
+      const auth = await orgless.kernel.getServiceAsync<any>('auth');
+      try {
+        auth.applyConfigPatch({ passwordHistoryCount: 3 });
+        const after = await probe(orgless).read();
+        expect(after.armed, 'the same seam the settings service writes arms it').toBe(true);
+        expect(after.observed).toContain('passwordHistoryCount=3');
+        await expect(assertArmed([probe(orgless)])).resolves.toBeUndefined();
+      } finally {
+        auth.applyConfigPatch({ passwordHistoryCount: undefined });
+      }
+
+      const restored = await probe(orgless).read();
+      expect(restored.armed, 'and the restore really disarmed it again').toBe(false);
+    });
+
+    it('assertArmed REJECTS the default config, naming the 0 default', async () => {
+      const err = await assertArmed([probe(orgless)]).catch((e: Error) => e);
+      expect(String(err)).toContain(REUSE_CONTROL);
+      expect(String(err)).toContain('defaults to 0');
+    });
+
+    it('a stack with no readable auth config is DISARMED whatever the predicate says', async () => {
+      // A predicate that would call `undefined` armed must not be able to turn
+      // "the service is gone" into a pass.
+      const verdict = await authSettingArmed({
+        stack: { kernel: { getServiceAsync: async () => undefined } } as unknown as VerifyStack,
+        setting: 'passwordHistoryCount',
+        armed: (v) => v === undefined,
+        control: REUSE_CONTROL,
+        disarmedBy: REUSE_DISARM,
+      }).read();
+      expect(verdict.armed).toBe(false);
+      expect(verdict.observed).toContain("no 'auth' service resolved");
+    });
+  });
+
+  // ── seededArmed — the row a control rides on ──────────────────────────────
+
+  describe('seededArmed', () => {
+    it('[control] finds a set that really seeded — so its negative reading is a real negative', async () => {
+      const verdict = await seededArmed({
+        stack: orgless,
+        object: 'sys_permission_set',
+        where: { name: 'member_default' },
+        control: 'the platform baseline permission set',
+        disarmedBy: 'a permission set that failed to seed grants the principal nothing',
+      }).read();
+      expect(verdict.armed).toBe(true);
+      expect(verdict.observed).toContain('is seeded');
+    });
+
+    it('reports DISARMED for a set that does not exist', async () => {
+      const verdict = await seededArmed({
+        stack: orgless,
+        object: 'sys_permission_set',
+        where: { name: 'no_such_set_8074' },
+        control: 'an app-declared permission set',
+        disarmedBy: 'a set that failed to seed grants the principal nothing',
+      }).read();
+      expect(verdict.armed).toBe(false);
+      expect(verdict.observed).toContain('never seeded');
+    });
+
+    it('reports DISARMED when the row exists but fails its own predicate', async () => {
+      const verdict = await seededArmed({
+        stack: orgless,
+        object: 'sys_permission_set',
+        where: { name: 'member_default' },
+        armed: () => false,
+        control: 'a seeded row that must also carry something',
+        disarmedBy: 'the row seeded but not the part the control rides on',
+      }).read();
+      expect(verdict.armed).toBe(false);
+      expect(verdict.observed).toContain('fails its own arming predicate');
+    });
+  });
+
+  // ── armedWhen — the general probe, both directions ────────────────────────
+
+  describe('armedWhen', () => {
+    const generic = (armed: (v: number) => boolean) =>
+      armedWhen<number>({
+        control: 'a generic control',
+        disarmedBy: 'a generic default',
+        observe: () => 7,
+        armed,
+        describe: (v) => `observed ${v}`,
+      });
+
+    it('is ARMED when its predicate holds and DISARMED when it does not', async () => {
+      expect((await generic((v) => v === 7).read()).armed).toBe(true);
+      expect((await generic((v) => v === 8).read()).armed).toBe(false);
+    });
+
+    it('treats a non-boolean predicate result as DISARMED', async () => {
+      // "not proven armed" is the safe direction for an ambiguous reading.
+      const sloppy = armedWhen<number>({
+        control: 'a control judged by a truthy non-boolean',
+        disarmedBy: 'a predicate that does not return a real boolean',
+        observe: () => 7,
+        armed: ((v: number) => v) as unknown as (v: number) => boolean,
+      });
+      expect((await sloppy.read()).armed).toBe(false);
+    });
+  });
+
+  // ── the guard's own vacuity refusals ──────────────────────────────────────
+
+  describe('the guard refuses its own vacuous spellings', () => {
+    it('assertArmed([]) throws — an empty declaration would certify everything', async () => {
+      await expect(assertArmed([])).rejects.toThrow(/arming declaration is EMPTY/);
+    });
+
+    it('principalArmed with nothing required throws at CONSTRUCTION', () => {
+      expect(() =>
+        principalArmed({
+          stack: orgless,
+          token: orglessMember,
+          who: 'nobody in particular',
+          control: WRITE_FLOOR,
+          disarmedBy: WRITE_FLOOR_DISARM,
+        }),
+      ).toThrow(/can never fail/);
+    });
+
+    it('seededArmed with an empty `where` throws at CONSTRUCTION', () => {
+      expect(() =>
+        seededArmed({
+          stack: orgless,
+          object: 'sys_permission_set',
+          where: {},
+          control: 'anything',
+          disarmedBy: 'anything',
+        }),
+      ).toThrow(/matches any row/);
+    });
+
+    it('a probe whose read THROWS counts as disarmed, never as fine', async () => {
+      const broken: ArmingProbe = {
+        control: 'a control whose probe cannot read the stack',
+        disarmedBy: 'an unreadable precondition',
+        read: async () => {
+          throw new Error('the service went away');
+        },
+      };
+      const err = await assertArmed([broken]).catch((e: Error) => e);
+      expect(String(err)).toContain('the arming probe itself threw');
+      expect(String(err)).toContain('the service went away');
+    });
+
+    it('names EVERY disarmed control, not just the first', async () => {
+      const err = await assertArmed([
+        principalArmed({
+          stack: orgless,
+          token: orglessMember,
+          who: 'the plain member',
+          positions: ['org_member'],
+          control: WRITE_FLOOR,
+          disarmedBy: WRITE_FLOOR_DISARM,
+        }),
+        authSettingArmed({
+          stack: orgless,
+          setting: 'passwordHistoryCount',
+          armed: (v) => Number(v) >= 1,
+          control: REUSE_CONTROL,
+          disarmedBy: REUSE_DISARM,
+        }),
+      ]).catch((e: Error) => e);
+      expect(String(err)).toContain(WRITE_FLOOR);
+      expect(String(err)).toContain(REUSE_CONTROL);
+      expect(String(err)).toContain('2 of 2 control(s)');
+    });
+
+    it('[positive control] a fully armed multi-probe declaration RESOLVES', async () => {
+      // The counterweight to every rejection case above.
+      await expect(
+        assertArmed([
+          principalArmed({
+            stack: orgbound,
+            token: orgboundMember,
+            who: 'the org-bound member',
+            positions: ['org_member'],
+            control: WRITE_FLOOR,
+            disarmedBy: WRITE_FLOOR_DISARM,
+          }),
+          seededArmed({
+            stack: orgbound,
+            object: 'sys_permission_set',
+            where: { name: 'member_default' },
+            control: 'the platform baseline permission set',
+            disarmedBy: 'a set that failed to seed grants the principal nothing',
+          }),
+        ]),
+      ).resolves.toBeUndefined();
+    });
+  });
+});