2 files changed, 91 insertions, 5 deletions
diff --git a/tests/common/com/android/documentsui/dirlist/TestEnvironment.java b/tests/common/com/android/documentsui/dirlist/TestEnvironment.java
index 2e91e0733..cf50f0780 100644
--- a/tests/common/com/android/documentsui/dirlist/TestEnvironment.java
+++ b/tests/common/com/android/documentsui/dirlist/TestEnvironment.java
@@ -88,9 +88,4 @@ public final class TestEnvironment implements DocumentsAdapter.Environment {
     @Override
     public void onBindDocumentHolder(DocumentHolder holder, Cursor cursor) {
     }
-
-    @Override
-    public String getCallingAppName() {
-        return "unknown";
-    }
 }
diff --git a/tests/unit/com/android/documentsui/picker/ApplicationNameTest.kt b/tests/unit/com/android/documentsui/picker/ApplicationNameTest.kt
new file mode 100644
index 000000000..7ee3b9aa6
--- /dev/null
+++ b/tests/unit/com/android/documentsui/picker/ApplicationNameTest.kt
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2025 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
+ *
+ *      http://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.android.documentsui.picker
+
+import android.app.Activity
+import android.content.pm.ApplicationInfo
+import android.content.pm.PackageManager
+import android.content.res.Resources
+import com.android.documentsui.R
+import com.android.documentsui.base.Shared
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.Parameterized
+import org.mockito.Mock
+import org.mockito.Mockito.eq
+import org.mockito.Mockito.`when` as whenever
+import org.mockito.MockitoAnnotations
+
+/**
+ * When apps are requesting access to a folder using `ACTION_OPEN_DOCUMENT_TREE` the application
+ * label is shown in the UI. Let's ensure that the label is appropriately sanitised.
+ */
+@RunWith(Parameterized::class)
+class ApplicationNameTest {
+    @Mock
+    private lateinit var mockActivity: Activity
+
+    @Mock
+    private lateinit var resources: Resources
+
+    @Mock
+    private lateinit var pm: PackageManager
+
+    companion object {
+        const val PACKAGE_NAME = "com.package.test"
+        const val ANONYMOUS_PACKAGE = "anonymous"
+
+        @Parameterized.Parameters(name = "{index}")
+        @JvmStatic
+        fun parameters() =
+            listOf(
+                // Normal labels return their values.
+                Pair("label", "label"),
+
+                // Newlines are stripped.
+                Pair("label\nlabel", "label label"),
+
+                // Labels are trimmed to 500 characters.
+                Pair("a".repeat(600), "a".repeat(500)),
+
+                // An empty label returns the anonymous package name.
+                Pair("", ANONYMOUS_PACKAGE)
+            )
+    }
+
+    @Parameterized.Parameter(0)
+    lateinit var testData: Pair<String, String>
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.openMocks(this)
+        whenever(mockActivity.resources).thenReturn(resources)
+        whenever(mockActivity.packageManager).thenReturn(pm)
+        whenever(resources.getString(R.string.anonymous_application)).thenReturn(ANONYMOUS_PACKAGE)
+        whenever<String>(mockActivity.callingPackage).thenReturn(PACKAGE_NAME)
+    }
+
+    @Test
+    fun testNameIsSanitized() {
+        val info = ApplicationInfo()
+        whenever(pm.getApplicationInfo(PACKAGE_NAME, 0)).thenReturn(info)
+
+        whenever(pm.getApplicationLabel(eq(info))).thenReturn(testData.first)
+        assertEquals(Shared.getCallingAppName(mockActivity), testData.second)
+    }
+}