test: add regression test for sats amount in order title

Author: grunch

bot/ordersActions.ts

@@ -400,4 +400,10 @@ const getNewRangeOrderPayload = async (order: IOrder) => {
   }
 };
 
-export { createOrder, getOrder, getOrders, getNewRangeOrderPayload };
+export {
+  createOrder,
+  getOrder,
+  getOrders,
+  getNewRangeOrderPayload,
+  getOrderTitleMessage,
+};

tests/bot/ordersActions.spec.ts

@@ -0,0 +1,98 @@
+const { expect } = require('chai');
+const { I18n } = require('@grammyjs/i18n');
+const { getOrderTitleMessage } = require('../../bot/ordersActions');
+
+// Real i18n context so the test exercises the actual locale strings and
+// their ${amount} interpolation (the part that regressed in PR #770).
+const i18nCtx = new I18n({
+  locale: 'en',
+  defaultLanguageOnMissing: true,
+  directory: 'locales',
+}).createContext('en', {});
+
+describe('getOrderTitleMessage', () => {
+  const anonymousUser: any = { username: 'alice', show_username: false };
+  const publicUser: any = { username: 'alice', show_username: true };
+
+  describe('fixed orders (amount set, price not from API)', () => {
+    it('shows the sats amount when selling', () => {
+      const title = getOrderTitleMessage(
+        anonymousUser,
+        'sell',
+        100,
+        'USD',
+        false,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('Selling 100 sats');
+    });
+
+    it('shows the sats amount when buying', () => {
+      const title = getOrderTitleMessage(
+        anonymousUser,
+        'buy',
+        100,
+        'USD',
+        false,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('Buying 100 sats');
+    });
+
+    it('shows the username and the sats amount when the user shows their name', () => {
+      const title = getOrderTitleMessage(
+        publicUser,
+        'sell',
+        100,
+        'USD',
+        false,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('@alice is selling 100 sats');
+    });
+  });
+
+  describe('market/range orders (amount is 0, price from API)', () => {
+    it('omits the amount when selling', () => {
+      const title = getOrderTitleMessage(
+        anonymousUser,
+        'sell',
+        0,
+        'USD',
+        true,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('Selling sats');
+    });
+
+    it('omits the amount when buying', () => {
+      const title = getOrderTitleMessage(
+        anonymousUser,
+        'buy',
+        0,
+        'USD',
+        true,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('Buying sats');
+    });
+
+    it('shows the username but omits the amount when the user shows their name', () => {
+      const title = getOrderTitleMessage(
+        publicUser,
+        'buy',
+        0,
+        'USD',
+        true,
+        i18nCtx,
+      );
+
+      expect(title).to.equal('@alice is buying sats');
+    });
+  });
+});