Add initial PayPal implementation behind a feature flag.

app/src/test/java/org/thoughtcrime/securesms/components/settings/app/subscription/donate/paypal/PayPalConfirmationResultTest.kt

@@ -0,0 +1,41 @@
+package org.thoughtcrime.securesms.components.settings.app.subscription.donate.paypal
+
+import android.app.Application
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import org.thoughtcrime.securesms.components.settings.app.subscription.PayPalRepository
+
+@RunWith(RobolectricTestRunner::class)
+@Config(application = Application::class)
+class PayPalConfirmationResultTest {
+
+  companion object {
+    private val PAYER_ID = "asdf"
+    private val PAYMENT_ID = "sdfg"
+    private val PAYMENT_TOKEN = "dfgh"
+
+    private val TEST_URL = "${PayPalRepository.ONE_TIME_RETURN_URL}?PayerID=$PAYER_ID&paymentId=$PAYMENT_ID&token=$PAYMENT_TOKEN"
+    private val TEST_MISSING_PARAM_URL = "${PayPalRepository.ONE_TIME_RETURN_URL}?paymentId=$PAYMENT_ID&token=$PAYMENT_TOKEN"
+  }
+
+  @Test
+  fun givenATestUrl_whenIFromUri_thenIExpectCorrectResult() {
+    val result = PayPalConfirmationResult.fromUrl(TEST_URL)
+
+    assertEquals(
+      PayPalConfirmationResult(PAYER_ID, PAYMENT_ID, PAYMENT_TOKEN),
+      result
+    )
+  }
+
+  @Test
+  fun givenATestUrlWithMissingField_whenIFromUri_thenIExpectNull() {
+    val result = PayPalConfirmationResult.fromUrl(TEST_MISSING_PARAM_URL)
+
+    assertNull(result)
+  }
+}