[ALFMOB-341] Add BFF integration test suite (productList, productDetails, searchProducts)

[hoangnhatdrk]

ALFMOB-341 — Integration test suite against local BFF

Adds a new :integration-test Android library module with instrumented tests that drive a real ApolloClient against a locally-running BFF, exercising the operations introduced in the BFF-migration epic.

Coverage

• productList — happy path, cursor pagination (page 2 distinct from page 1), PRICE_ASC ordering, brand filter.
• productDetails — happy path for a real handle, plus variants reconstructed-from-options[] consistency.
• searchProducts — happy path, cursor pagination.

Tests are data-driven (handles/terms are read from productList for the frontpage collection) so they tolerate changing BFF data, and assert on shape rather than exact values.

How it runs

• Instrumented only — runs via ./gradlew :integration-test:connectedDebugAndroidTest (an emulator + a BFF on :3000). Not part of testDebugUnitTest, so PR unit lanes are unaffected.
• A readiness gate (assumeTrue) skips — not fails — when no BFF is reachable, so the suite stays green on devices/CI without a backend.
• Standalone test APK needs its own INTERNET permission + a cleartext allowance for 10.0.2.2 (added via the androidTest manifest); these are otherwise only present in :app.

Verification

Ran on a Pixel_10_Pro emulator against the live local BFF: 7 tests, 0 failures, 0 skipped. detekt clean.

Docs / follow-ups

• README gains an "Integration tests (local BFF)" section (start BFF → emulator → run target).
• CI orchestration (boot/teardown script + GitHub Actions job) is tracked separately in ALFMOB-409.

[Copilot]

Pull request overview

Adds a new :integration-test Android library module containing instrumented integration tests that exercise the new BFF GraphQL operations (productList, productDetails, searchProducts) against a locally-running backend (emulator host alias 10.0.2.2). This fits the ongoing BFF migration by validating server responses and pagination behavior with a real ApolloClient, while keeping unit-test lanes unaffected.

Changes:

• Introduces the :integration-test module with a JUnit5 instrumented test suite (reachability-gated via assumeTrue).
• Adds test-only manifest + network security config to allow INTERNET + cleartext to 10.0.2.2.
• Updates docs and aligns PLP placeholder collection handle to frontpage.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
settings.gradle.kts	Includes the new :integration-test module in the Gradle build.
README.md	Documents how to run the local-BFF integration tests and where reports are generated.
integration-test/build.gradle.kts	Declares the new module and its androidTest-only dependencies.
integration-test/src/main/AndroidManifest.xml	Provides a minimal manifest for the new library module.
integration-test/src/androidTest/AndroidManifest.xml	Adds INTERNET permission and points to a test-only network security config.
integration-test/src/androidTest/res/xml/network_security_config.xml	Allows cleartext traffic to 10.0.2.2 for emulator → host BFF access.
integration-test/src/androidTest/java/com/mindera/alfie/integrationtest/BffIntegrationTest.kt	Adds a shared base with BFF reachability gating + Apollo execution helpers.
integration-test/src/androidTest/java/com/mindera/alfie/integrationtest/ProductListIntegrationTest.kt	Validates productList happy path, pagination, sorting, and brand filtering.
integration-test/src/androidTest/java/com/mindera/alfie/integrationtest/ProductDetailsIntegrationTest.kt	Validates productDetails shape and variant/options consistency.
integration-test/src/androidTest/java/com/mindera/alfie/integrationtest/SearchProductsIntegrationTest.kt	Validates searchProducts happy path and cursor pagination.
feature/plp/src/main/java/com/mindera/alfie/feature/plp/ProductListViewModel.kt	Switches the BFF placeholder collection handle to frontpage.

[amccall-mindera]

amount is a String from the GraphQL schema — .sorted() on a List<String> sorts lexicographically, not numerically. Prices like "9.99" and "10.00" will be misordered ('9' > '1'), so the test gives a false green whenever prices span a power-of-ten boundary.

val prices = response.products.map {
    it.productListEntryFragment.priceRange.minVariantPrice.moneyFragment.amount.toBigDecimal()
}
assertEquals(prices.sorted(), prices, "PRICE_ASC should return non-decreasing min prices")