Preview Test

app/src/test/java/net/helcel/cowspent/NoInfiniteAnimationsRule.kt

@@ -0,0 +1,39 @@
+package net.helcel.cowspent
+
+import androidx.compose.ui.ExperimentalComposeUiApi
+import androidx.compose.ui.InternalComposeUiApi
+import androidx.compose.ui.platform.InfiniteAnimationPolicy
+import androidx.compose.ui.platform.WindowRecomposerFactory
+import androidx.compose.ui.platform.WindowRecomposerPolicy
+import androidx.compose.ui.platform.createLifecycleAwareWindowRecomposer
+import kotlinx.coroutines.CancellationException
+import org.junit.rules.TestWatcher
+import org.junit.runner.Description
+
+/**
+ * Robolectric's paused looper only goes idle once nothing is left to run, but a Compose infinite
+ * animation (the pull-to-refresh spinner, for instance) keeps requesting frames forever. Any test
+ * that launches an activity whose UI shows one then burns minutes of CPU inside
+ * ActivityScenario.launch() before it gives up.
+ *
+ * ComposeTestRule solves this by installing an InfiniteAnimationPolicy that cancels those
+ * animations; this rule does the same for tests driving an activity directly.
+ */
+@OptIn(ExperimentalComposeUiApi::class, InternalComposeUiApi::class)
+class NoInfiniteAnimationsRule : TestWatcher() {
+
+    private object CancelInfiniteAnimations : InfiniteAnimationPolicy {
+        override suspend fun <R> onInfiniteOperation(block: suspend () -> R): R =
+            throw CancellationException("Infinite animations are disabled in unit tests")
+    }
+
+    override fun starting(description: Description) {
+        WindowRecomposerPolicy.setFactory { view ->
+            view.createLifecycleAwareWindowRecomposer(CancelInfiniteAnimations)
+        }
+    }
+
+    override fun finished(description: Description) {
+        WindowRecomposerPolicy.setFactory(WindowRecomposerFactory.LifecycleAware)
+    }
+}

app/src/test/java/net/helcel/cowspent/android/PreviewsTest.kt

@@ -0,0 +1,86 @@
+package net.helcel.cowspent.android
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.*
+import net.helcel.cowspent.NoInfiniteAnimationsRule
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+/**
+ * Every `@Preview` in the app, rendered once.
+ *
+ * Previews are compiled into the release APK and are the only caller of some composables with
+ * awkward argument shapes, so a preview that throws is a real compile-time-clean runtime break that
+ * nothing else would catch. This is a smoke test: it asserts the tree composed, not what it looks
+ * like — the behaviour of each screen is covered by that screen's own tests.
+ */
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [34], qualifiers = "w1080dp-h2400dp")
+class PreviewsTest {
+
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    @get:Rule
+    val noInfiniteAnimations = NoInfiniteAnimationsRule()
+
+    private fun renders(preview: @Composable () -> Unit) {
+        composeTestRule.setContent { preview() }
+        composeTestRule.waitForIdle()
+        composeTestRule.onRoot().assertExists()
+    }
+
+    @Test fun testBillItemRow() = renders { net.helcel.cowspent.android.main.BillItemRowPreview() }
+    @Test fun testSectionHeader() = renders { net.helcel.cowspent.android.main.SectionHeaderPreview() }
+    @Test fun testEmptyProjectsState() = renders { net.helcel.cowspent.android.main.EmptyProjectsStatePreview() }
+    @Test fun testEmptyMembersState() = renders { net.helcel.cowspent.android.main.EmptyMembersStatePreview() }
+    @Test fun testEmptyBillsState() = renders { net.helcel.cowspent.android.main.EmptyBillsStatePreview() }
+
+    @Test fun testEditBillScreen() = renders { net.helcel.cowspent.android.bill_edit.EditBillScreenPreview() }
+    @Test fun testEditBillScreenWeighted() = renders { net.helcel.cowspent.android.bill_edit.EditBillScreenWeightedPreview() }
+    @Test fun testEditBillScreenCustom() = renders { net.helcel.cowspent.android.bill_edit.EditBillScreenCustomPreview() }
+    @Test fun testEditBillScreenPercent() = renders { net.helcel.cowspent.android.bill_edit.EditBillScreenPercentPreview() }
+
+    @Test fun testUserAvatar() = renders { net.helcel.cowspent.android.helper.UserAvatarPreview() }
+    @Test fun testUserAvatarCustomColor() = renders { net.helcel.cowspent.android.helper.UserAvatarCustomColorPreview() }
+    @Test fun testUserAvatarDisabled() = renders { net.helcel.cowspent.android.helper.UserAvatarDisabledPreview() }
+
+    @Test fun testProjectSettlementUI() = renders { net.helcel.cowspent.android.project.settle.ProjectSettlementUIPreview() }
+    @Test fun testProjectSettlementUIBalanced() = renders { net.helcel.cowspent.android.project.settle.ProjectSettlementUIBalancedPreview() }
+
+    @Test fun testLabelManagementCategories() = renders { net.helcel.cowspent.android.label.LabelManagementCategoriesPreview() }
+    @Test fun testLabelManagementPaymentModes() = renders { net.helcel.cowspent.android.label.LabelManagementPaymentModesPreview() }
+
+    @Test fun testDrawerItem() = renders { net.helcel.cowspent.android.drawer.DrawerItemPreview() }
+    @Test fun testDrawer() = renders { net.helcel.cowspent.android.drawer.DrawerPreview() }
+
+    @Test fun testCurrencyRow() = renders { net.helcel.cowspent.android.currencies.CurrencyRowPreview() }
+    @Test fun testManageCurrenciesScreen() = renders { net.helcel.cowspent.android.currencies.ManageCurrenciesScreenPreview() }
+
+    @Test fun testProjectStatisticsTable() = renders { net.helcel.cowspent.android.statistics.ProjectStatisticsTablePreview() }
+    @Test fun testProjectSpendingGraph() = renders { net.helcel.cowspent.android.statistics.ProjectSpendingGraphPreview() }
+    @Test fun testProjectSankeyDiagram() = renders { net.helcel.cowspent.android.statistics.ProjectSankeyDiagramPreview() }
+
+    @Test fun testProjectShareDialogContent() = renders { net.helcel.cowspent.android.project.ProjectShareDialogContentPreview() }
+    @Test fun testMemberManagementScreen() = renders { net.helcel.cowspent.android.project.member.MemberManagementScreenPreview() }
+    @Test fun testMemberEditDialogContent() = renders { net.helcel.cowspent.android.project.member.MemberEditDialogContentPreview() }
+    @Test fun testMemberAddDialogContent() = renders { net.helcel.cowspent.android.project.member.MemberAddDialogContentPreview() }
+    @Test fun testEditProjectScreen() = renders { net.helcel.cowspent.android.project.edit.EditProjectScreenPreview() }
+    @Test fun testNewProjectScreen() = renders { net.helcel.cowspent.android.project.create.NewProjectScreenPreview() }
+
+    @Test fun testColorPicker() = renders { net.helcel.cowspent.android.helper.ColorPickerPreview() }
+    @Test fun testLabelBillsScreen() = renders { net.helcel.cowspent.android.bill_label.LabelBillsScreenPreview() }
+    @Test fun testAccountScreen() = renders { net.helcel.cowspent.android.account.AccountScreenPreview() }
+    @Test fun testAboutScreen() = renders { net.helcel.cowspent.android.about.AboutScreenPreview() }
+
+    @Test fun testSimpleAlertDialog() = renders { net.helcel.cowspent.android.helper.SimpleAlertDialogPreview() }
+    @Test fun testConfirmationDialog() = renders { net.helcel.cowspent.android.helper.ConfirmationDialogPreview() }
+    @Test fun testListDialogWithIcons() = renders { net.helcel.cowspent.android.helper.ListDialogWithIconsPreview() }
+
+    /** Opens a real database, so it is the one preview that needs a Robolectric context to exist. */
+    @Test fun testBillsListScreen() = renders { net.helcel.cowspent.android.main.BillsListScreenPreview() }
+}