Add CardElement Activity tests

payments-core/src/test/java/com/stripe/android/view/CardElementActivityTests.kt

@@ -0,0 +1,109 @@
+package com.stripe.android.view
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.os.Parcelable
+import android.widget.LinearLayout
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import com.stripe.android.ApiKeyFixtures
+import com.stripe.android.PaymentConfiguration
+import com.stripe.android.R
+import com.stripe.android.utils.createTestActivityRule
+import kotlinx.parcelize.Parcelize
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import java.util.Locale
+
+/**
+ * Tests that [LifecycleOwnerDelegate] is properly stubbing required dependencies to display CardElement views
+ * on base [Activity]. Removing [LifecycleOwnerDelegate] calls from `onAttachedToWindow` for [CardInputWidget],
+ * [CardFormView], or [CardMultilineWidget] will cause these to fail.
+ */
+@RunWith(RobolectricTestRunner::class)
+internal class CardElementActivityTests {
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+
+    @get:Rule
+    val testActivityRule = createTestActivityRule<CardElementTestActivity>(useMaterial = true)
+
+    @Before
+    fun setup() {
+        PaymentConfiguration.init(context, ApiKeyFixtures.FAKE_PUBLISHABLE_KEY)
+    }
+
+    @Test
+    fun `displays CardFormView on Activity`() {
+        runCardElementTest(CardElementTestActivity.CardElementView.CardFormView)
+    }
+
+    @Test
+    fun `displays CardInputWidget on Activity`() {
+        runCardElementTest(CardElementTestActivity.CardElementView.CardInputWidget)
+    }
+
+    @Test
+    fun `displays CardMultilineWidget on Activity`() {
+        runCardElementTest(CardElementTestActivity.CardElementView.CardMultilineWidget)
+    }
+
+    private fun runCardElementTest(
+        viewType: CardElementTestActivity.CardElementView,
+        locale: Locale = Locale.US
+    ) {
+        val originalLocale = Locale.getDefault()
+        Locale.setDefault(locale)
+
+        val activityScenario = ActivityScenario.launch<CardElementTestActivity>(
+            Intent(context, CardElementTestActivity::class.java).apply {
+                putExtra("args", CardElementTestActivity.Args(viewType))
+            }
+        )
+
+        activityScenario.close()
+        Locale.setDefault(originalLocale)
+    }
+}
+
+internal class CardElementTestActivity : Activity() {
+
+    @Parcelize
+    data class Args(
+        val viewType: CardElementView
+    ) : Parcelable
+
+    enum class CardElementView {
+        CardFormView,
+        CardInputWidget,
+        CardMultilineWidget
+    }
+
+    private val args: Args by lazy {
+        @Suppress("DEPRECATION")
+        intent.getParcelableExtra("args")!!
+    }
+
+    private val view by lazy {
+        when (args.viewType) {
+            CardElementView.CardFormView -> CardFormView(this)
+            CardElementView.CardInputWidget -> CardInputWidget(this)
+            CardElementView.CardMultilineWidget -> CardMultilineWidget(this)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setTheme(R.style.StripeDefaultTheme)
+
+        val layout = LinearLayout(this).apply {
+            addView(view)
+        }
+        setContentView(layout)
+    }
+}