diff --git a/hyyypertool.code-workspace b/hyyypertool.code-workspace
index 196613eb..ab579332 100644
--- a/hyyypertool.code-workspace
+++ b/hyyypertool.code-workspace
@@ -201,6 +201,17 @@
         "problemMatcher": ["$tsc-watch"],
         "runOptions": { "instanceLimit": 1 },
       },
+      {
+        "label": "🧪 Watch Test : Current file",
+        "command": "bun test --watch ${fileDirname}/${fileBasename}",
+        "type": "shell",
+        "group": "build",
+        "options": {
+          "cwd": "${workspaceFolder:root}",
+        },
+        "problemMatcher": ["$tsc-watch"],
+        "runOptions": { "instanceLimit": 1 },
+      },
       {
         "label": "🧪 Cypress Studio",
         "command": "pnpm run studio",
diff --git a/packages/~/users/repository/src/count_gmail_members.test.ts b/packages/~/users/repository/src/count_gmail_members.test.ts
new file mode 100644
index 00000000..a33cd036
--- /dev/null
+++ b/packages/~/users/repository/src/count_gmail_members.test.ts
@@ -0,0 +1,56 @@
+//
+
+import {
+  create_pink_diamond_user,
+  create_red_diamond_user,
+  create_unicorn_organization,
+} from "@~/moncomptepro.database/seed/unicorn";
+import {
+  add_user_to_organization,
+  empty_database,
+  migrate,
+  pg,
+} from "@~/moncomptepro.database/testing";
+import { beforeAll, beforeEach, expect, test } from "bun:test";
+import { count_gmail_members } from "./count_gmail_members";
+
+//
+
+beforeAll(migrate);
+beforeEach(empty_database);
+
+test("returns pink diamond", async () => {
+  const unicorn_organization_id = await create_unicorn_organization(pg);
+  const pink_diamond_user_id = await create_pink_diamond_user(pg);
+  await add_user_to_organization({
+    organization_id: unicorn_organization_id,
+    user_id: pink_diamond_user_id,
+  });
+  const red_diamond_user_id = await create_red_diamond_user(pg);
+  await add_user_to_organization({
+    organization_id: unicorn_organization_id,
+    user_id: red_diamond_user_id,
+  });
+
+  const emails = await count_gmail_members(pg, {
+    siret: "🦄",
+    domain: "@unicorn.xyz",
+  });
+
+  expect(emails).toEqual([
+    {
+      email: "pink.diamond@unicorn.xyz",
+      organization: {
+        cached_libelle: "🦄 libelle",
+        siret: "🦄 siret",
+      },
+    },
+    {
+      email: "red.diamond@unicorn.xyz",
+      organization: {
+        cached_libelle: "🦄 libelle",
+        siret: "🦄 siret",
+      },
+    },
+  ]);
+});
diff --git a/packages/~/users/repository/src/count_gmail_members.ts b/packages/~/users/repository/src/count_gmail_members.ts
new file mode 100644
index 00000000..ed78d135
--- /dev/null
+++ b/packages/~/users/repository/src/count_gmail_members.ts
@@ -0,0 +1,37 @@
+//
+
+import { schema, type MonComptePro_PgDatabase } from "@~/moncomptepro.database";
+import { and, eq, like } from "drizzle-orm";
+
+//
+
+export async function count_gmail_members(
+  pg: MonComptePro_PgDatabase,
+  { domain, siret }: { domain: string; siret: string },
+) {
+  return pg
+    .select({
+      email: schema.users.email,
+      organization: {
+        cached_libelle: schema.organizations.cached_libelle,
+        siret: schema.organizations.siret,
+      },
+    })
+    .from(schema.users)
+    .innerJoin(
+      schema.users_organizations,
+      eq(schema.users.id, schema.users_organizations.user_id),
+    )
+    .innerJoin(
+      schema.organizations,
+      eq(schema.users_organizations.organization_id, schema.organizations.id),
+    )
+    .where(
+      and(
+        like(schema.organizations.siret, `${siret}%`),
+        like(schema.users.email, `%${domain}`),
+      ),
+    );
+}
+
+export type count_gmail_members_dto = ReturnType<typeof count_gmail_members>;