Update accessibility snippets (#508)

* Add new and updated accessibility DAC snippets

* Import hideFromAccessibility

* Apply Spotless

* Revert removal of some existing a11y snippets

Author: simona-anomis

compose/snippets/build.gradle.kts

@@ -160,6 +160,7 @@ dependencies {
     debugImplementation(libs.androidx.compose.ui.tooling)
 
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)
+    androidTestImplementation(libs.androidx.compose.ui.test.junit4.accessibility)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
 
 }

compose/snippets/src/androidTest/java/com/example/compose/snippets/accessibility/AccessibilitySnippets.kt

@@ -16,25 +16,109 @@
 
 package com.example.compose.snippets.accessibility
 
+import androidx.activity.ComponentActivity
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Text
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.semantics.SemanticsActions
+import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.getOrNull
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.test.SemanticsMatcher
 import androidx.compose.ui.test.assert
+import androidx.compose.ui.test.junit4.accessibility.enableAccessibilityChecks
 import androidx.compose.ui.test.junit4.createAndroidComposeRule
-import com.example.compose.snippets.MyActivity
+import androidx.compose.ui.test.onRoot
+import androidx.compose.ui.test.tryPerformAccessibilityChecks
+import androidx.compose.ui.unit.dp
+import com.google.android.apps.common.testing.accessibility.framework.AccessibilityCheckResult
+import com.google.android.apps.common.testing.accessibility.framework.integrations.espresso.AccessibilityValidator
 import org.junit.Ignore
 import org.junit.Rule
 import org.junit.Test
 
-class AccessibilitySnippetsTest {
+class AccessibilityTest {
+
+// [START android_compose_accessibility_testing_label]
     @Rule
     @JvmField
-    val composeTestRule = createAndroidComposeRule<MyActivity>()
+    val composeTestRule = createAndroidComposeRule<ComponentActivity>()
+
+    @Test
+    fun noAccessibilityLabel() {
+        composeTestRule.setContent {
+            Box(
+                modifier = Modifier
+                    .size(50.dp, 50.dp)
+                    .background(color = Color.Gray)
+                    .clickable { }
+                    .semantics {
+                        contentDescription = ""
+                    }
+            )
+        }
 
-    private val nodeMatcher = SemanticsMatcher("DUMMY") { it.isRoot }
+        composeTestRule.enableAccessibilityChecks()
 
-    @Ignore("Dummy test")
+        // Any action (such as performClick) will perform accessibility checks too:
+        composeTestRule.onRoot().tryPerformAccessibilityChecks()
+    }
+// [END android_compose_accessibility_testing_label]
 
+// [START android_compose_accessibility_testing_click]
+    @Test
+    fun smallClickTarget() {
+        composeTestRule.setContent {
+            Box(
+                modifier = Modifier
+                    .size(20.dp, 20.dp)
+                    .background(color = Color(0xFFFAFBFC))
+                    .clickable { }
+            )
+        }
+
+        composeTestRule.enableAccessibilityChecks()
+
+        // Any action (such as performClick) will perform accessibility checks too:
+        composeTestRule.onRoot().tryPerformAccessibilityChecks()
+    }
+// [END android_compose_accessibility_testing_click]
+
+// [START android_compose_accessibility_testing_validator]
+    @Test
+    fun lowContrastScreen() {
+        composeTestRule.setContent {
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .background(color = Color(0xFFFAFBFC)),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(text = "Hello", color = Color(0xFFB0B1B2))
+            }
+        }
+
+        // Optionally, set AccessibilityValidator manually
+        val accessibilityValidator = AccessibilityValidator()
+            .setThrowExceptionFor(
+                AccessibilityCheckResult.AccessibilityCheckResultType.WARNING
+            )
+
+        composeTestRule.enableAccessibilityChecks(accessibilityValidator)
+
+        composeTestRule.onRoot().tryPerformAccessibilityChecks()
+    }
+// [END android_compose_accessibility_testing_validator]
+
+    private val nodeMatcher = SemanticsMatcher(description = "DUMMY") { it.isRoot }
+
+    @Ignore("Dummy test")
 // [START android_compose_accessibility_testing]
     @Test
     fun test() {

compose/snippets/src/androidTest/java/com/example/compose/snippets/semantics/SemanticsSnippets.kt

@@ -16,7 +16,6 @@
 
 package com.example.compose.snippets.semantics
 
-import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.semantics.SemanticsProperties