test(PayPal): update instrumentation tests for dropped app_switch_context.native_app

createRequestBody no longer emits the nested app_switch_context.native_app
structure, so the instrumentation tests now assert the flat app switch fields
(os_type, os_version, merchant_app_return_url) and that app_switch_context is
absent. Fixes the failing PayPal instrumentation tests on this branch.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: santugowda

PayPal/src/androidTest/java/com/braintreepayments/api/paypal/PayPalCheckoutRequestTest.kt

@@ -330,10 +330,10 @@ class PayPalCheckoutRequestTest {
 
         val json = JSONObject(result)
         assertTrue(json.getBoolean("launch_paypal_app"))
-        val nativeApp = json.getJSONObject("app_switch_context").getJSONObject("native_app")
-        assertEquals("ANDROID", nativeApp.getString("os_type"))
-        assertNotNull(nativeApp.getString("os_version"))
-        assertEquals("https://merchant.example.com/applink", nativeApp.getString("app_url"))
+        assertEquals("Android", json.getString("os_type"))
+        assertNotNull(json.getString("os_version"))
+        assertEquals("https://merchant.example.com/applink", json.getString("merchant_app_return_url"))
+        assertFalse(json.has("app_switch_context"))
     }
 
     @Test
@@ -354,6 +354,8 @@ class PayPalCheckoutRequestTest {
 
         val json = JSONObject(result)
         assertFalse(json.has("launch_paypal_app"))
+        assertFalse(json.has("os_type"))
+        assertFalse(json.has("merchant_app_return_url"))
         assertFalse(json.has("app_switch_context"))
     }
 

PayPal/src/androidTest/java/com/braintreepayments/api/paypal/PayPalVaultRequestTest.kt

@@ -141,7 +141,7 @@ class PayPalVaultRequestTest {
     }
 
     @Test
-    fun createRequestBody_withAppSwitchEnabled_returnsNestedNativeAppStructure() {
+    fun createRequestBody_withAppSwitchEnabled_includesAppSwitchParams() {
         val request = PayPalVaultRequest(hasUserLocationConsent = true).apply {
             enablePayPalAppSwitch = true
         }
@@ -156,10 +156,10 @@ class PayPalVaultRequestTest {
 
         val json = JSONObject(result)
         assertTrue(json.getBoolean("launch_paypal_app"))
-        val nativeApp = json.getJSONObject("app_switch_context").getJSONObject("native_app")
-        assertEquals("ANDROID", nativeApp.getString("os_type"))
-        assertNotNull(nativeApp.getString("os_version"))
-        assertEquals("https://merchant.example.com/applink", nativeApp.getString("app_url"))
+        assertEquals("Android", json.getString("os_type"))
+        assertNotNull(json.getString("os_version"))
+        assertEquals("https://merchant.example.com/applink", json.getString("merchant_app_return_url"))
+        assertFalse(json.has("app_switch_context"))
     }
 
     @Test