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        testScope.runTest {
            every { mockBillingClient.isReady } returns true
            stubQueryPurchases(errorResult(), emptyList())

            val result = billingManagerImpl.restorePurchases()

            assertThat(result).isEqualTo(RestoreResult.Error(BillingClient.BillingResponseCode.ERROR))
        }

    // ── Tests: DebugBillingOverride — FORCE_PREMIUM short-circuit ────────────────

    @Test
    fun `FORCE_PREMIUM sets isPremium to true and short-circuits purchase flow`() =
        testScope.runTest {
            preferences.setDebugBillingOverrideMode(DebugBillingOverrideMode.FORCE_PREMIUM)
            advanceUntilIdle()

            assertThat(billingManagerImpl.isPremium.value).isTrue()

            val mockActivity = mockk<Activity>(relaxed = true)
            val result = billingManagerImpl.launchPremiumPurchaseFlow(mockActivity)

            assertThat(result).isEqualTo(BillingLaunchResult.Success)
            // Ensure real BillingClient was NOT asked to launch flow or query details
            verify(exactly = 0) { mockBillingClient.launchBillingFlow(any(), any()) }
        }

    @Test
    fun `FORCE_FREE sets isPremium to false even if real purchase exists`() =
        testScope.runTest {
            // Real purchase exists
            val purchase = makePurchase(state = Purchase.PurchaseState.PURCHASED, acknowledged = true)
            stubStartConnectionOk()
            stubQueryPurchases(okResult(), listOf(purchase))
            stubQueryProductDetailsOk()
            billingManagerImpl.startConnection()
            advanceUntilIdle()
            assertThat(billingManagerImpl.isPremium.value).isTrue()

            // Apply FORCE_FREE override
            preferences.setDebugBillingOverrideMode(DebugBillingOverrideMode.FORCE_FREE)
            advanceUntilIdle()

            assertThat(billingManagerImpl.isPremium.value).isFalse()
        }

    @Test
    fun `FORCE_PREMIUM makes restorePurchases return Success(hadPurchase=true)`() =
        testScope.runTest {
            preferences.setDebugBillingOverrideMode(DebugBillingOverrideMode.FORCE_PREMIUM)
            advanceUntilIdle()

            val result = billingManagerImpl.restorePurchases()

            assertThat(result).isEqualTo(RestoreResult.Success(hadPurchase = true))
            verify(exactly = 0) { mockBillingClient.queryPurchasesAsync(any<QueryPurchasesParams>(), any()) }
        }

    // ── Test fakes ───────────────────────────────────────────────────────────────

    private inner class FakeAppPreferencesStore(