fix: add test for FieldValue.increment to plugin-firestore-admin (#123)

Author: hunterliu1003

packages/plugin-firestore-admin/test/external/fieldValue.test.ts

@@ -0,0 +1,29 @@
+import { pokedex } from '@magnetarjs/test-utils'
+import { FieldValue } from 'firebase-admin/firestore'
+import { assert, expect, test } from 'vitest'
+import { createMagnetarInstance } from '../helpers/createMagnetarInstance.js'
+import { firestoreDeepEqual } from '../helpers/firestoreDeepEqual.js'
+
+{
+  const testName = 'fieldValue increment'
+  test(testName, async () => {
+    const { pokedexModule } = await createMagnetarInstance(testName, {
+      insertDocs: { 'pokedex/1': pokedex(1) },
+    })
+    await firestoreDeepEqual(testName, 'pokedex/1', pokedex(1))
+    assert.deepEqual(pokedexModule.doc('1').data, pokedex(1))
+
+    const payload = { base: { HP: FieldValue.increment(1) as any } }
+    try {
+      await pokedexModule.doc('1').merge(payload)
+    } catch (error) {
+      assert.fail(JSON.stringify(error))
+    }
+
+    const _pokedex = pokedexModule.doc('1').data
+    const pokedexHp = _pokedex?.base.HP as any
+
+    expect(pokedexHp.constructor.name).toBe('NumericIncrementTransform')
+    expect(pokedexHp.operand).toBe(1)
+  })
+}