Add test for NewsResourceCard

core-ui/build.gradle.kts

@@ -20,6 +20,12 @@ plugins {
     id("nowinandroid.spotless")
 }
 
+android {
+    defaultConfig {
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+}
+
 dependencies {
     implementation(project(":core-designsystem"))
     implementation(project(":core-model"))
@@ -47,4 +53,6 @@ dependencies {
     api(libs.androidx.compose.runtime.livedata)
     api(libs.androidx.metrics)
     api(libs.androidx.tracing.ktx)
+
+    androidTestImplementation(project(":core-testing"))
 }

core-ui/src/androidTest/java/com/google/samples/apps/nowinandroid/core/ui/NewsResourceCardTest.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.ui
+
+import androidx.compose.ui.test.assertHasClickAction
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.onNodeWithText
+import com.google.samples.apps.nowinandroid.core.model.data.previewNewsResources
+import org.junit.Rule
+import org.junit.Test
+
+class NewsResourceCardTest {
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    @Test
+    fun testNewsResourceCard_displaysNewsResource() {
+        val newsResource = previewNewsResources[0]
+        var dateFormatted = ""
+
+        composeTestRule.setContent {
+            NewsResourceCardExpanded(
+                newsResource = newsResource,
+                isBookmarked = false,
+                onToggleBookmark = {},
+                onClick = {}
+            )
+
+            dateFormatted = dateFormatted(publishDate = newsResource.publishDate)
+        }
+
+        composeTestRule
+            .onNodeWithText(newsResource.title)
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText(newsResource.authors[0].name.uppercase())
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText(dateFormatted)
+            .assertIsDisplayed()
+
+        composeTestRule
+            .onNodeWithText(newsResource.content)
+            .assertIsDisplayed()
+    }
+
+    @Test
+    fun testNewsResourceCard_hasClickAction() {
+        val newsResource = previewNewsResources[0]
+
+        composeTestRule.setContent {
+            NewsResourceCardExpanded(
+                newsResource = newsResource,
+                isBookmarked = false,
+                onToggleBookmark = {},
+                onClick = { }
+            )
+        }
+
+        composeTestRule.onNodeWithTag(NewsResourceCardTestTag).assertHasClickAction()
+    }
+}

core-ui/src/main/java/com/google/samples/apps/nowinandroid/core/ui/NewsResourceCard.kt

@@ -16,6 +16,7 @@
 
 package com.google.samples.apps.nowinandroid.core.ui
 
+import androidx.annotation.VisibleForTesting
 import androidx.compose.foundation.background
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
@@ -50,6 +51,7 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalInspectionMode
+import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.onClick
@@ -75,6 +77,8 @@ import kotlinx.datetime.toJavaInstant
  * [NewsResource] card used on the following screens: For You, Episodes, Saved
  */
 
+const val NewsResourceCardTestTag = "NewsResourceCardTestTag"
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun NewsResourceCardExpanded(
@@ -91,9 +95,11 @@ fun NewsResourceCardExpanded(
         colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface),
         // Use custom label for accessibility services to communicate button's action to user.
         // Pass null for action to only override the label and not the actual action.
-        modifier = modifier.semantics {
-            onClick(label = clickActionLabel, action = null)
-        }
+        modifier = modifier
+            .semantics {
+                onClick(label = clickActionLabel, action = null)
+            }
+            .testTag(NewsResourceCardTestTag)
     ) {
         Column {
             if (!newsResource.headerImageUrl.isNullOrEmpty()) {
@@ -223,7 +229,8 @@ fun BookmarkButton(
 }
 
 @Composable
-private fun dateFormatted(publishDate: Instant): String {
+@VisibleForTesting
+fun dateFormatted(publishDate: Instant): String {
     var zoneId by remember { mutableStateOf(ZoneId.systemDefault()) }
 
     val context = LocalContext.current