[GSoC] Adapter Tests (#4488)

* Added FolderAdapterTest

* Image Adapter Test

app/src/test/kotlin/fr/free/nrw/commons/customselector/ui/adapter/FolderAdapterTest.kt

@@ -0,0 +1,81 @@
+package fr.free.nrw.commons.customselector.ui.adapter
+
+import fr.free.nrw.commons.R
+import android.content.Context
+import android.net.Uri
+import android.view.LayoutInflater
+import android.view.View
+import android.widget.GridLayout
+import fr.free.nrw.commons.TestCommonsApplication
+import fr.free.nrw.commons.customselector.listeners.FolderClickListener
+import fr.free.nrw.commons.customselector.model.Folder
+import fr.free.nrw.commons.customselector.model.Image
+import fr.free.nrw.commons.customselector.ui.selector.CustomSelectorActivity
+import org.junit.Before
+import org.junit.Test
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.runner.RunWith
+import org.mockito.Mockito
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+/**
+ * Custom Selector Folder Adapter Test.
+ */
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [21], application = TestCommonsApplication::class)
+class FolderAdapterTest {
+
+    private var uri: Uri = Mockito.mock(Uri::class.java)
+    private lateinit var activity: CustomSelectorActivity
+    private lateinit var folderAdapter: FolderAdapter
+    private lateinit var image: Image
+    private lateinit var folder: Folder
+    private lateinit var folderList: ArrayList<Folder>
+
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        activity = Robolectric.buildActivity(CustomSelectorActivity::class.java).get()
+        image = Image(1, "image", uri, "abc/abc", 1, "bucket1")
+        folder = Folder(1, "bucket1", ArrayList(listOf(image)))
+        folderList = ArrayList(listOf(folder))
+        folderAdapter = FolderAdapter(activity, activity as FolderClickListener)
+    }
+
+    /**
+     * Test on create view holder.
+     */
+    @Test
+    fun onCreateViewHolder() {
+        folderAdapter.createViewHolder(GridLayout(activity), 0)
+    }
+
+    /**
+     * Test on bind view holder.
+     */
+    @Test
+    fun onBindViewHolder() {
+        folderAdapter.init(folderList)
+        val inflater = activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
+        val listItemView: View = inflater.inflate(R.layout.item_custom_selector_folder, null, false)
+        folderAdapter.onBindViewHolder(FolderAdapter.FolderViewHolder(listItemView), 0)
+    }
+
+    /**
+     * Test init.
+     */
+    @Test
+    fun init() {
+        folderAdapter.init(folderList)
+    }
+
+    /**
+     * Test get item count.
+     */
+    @Test
+    fun getItemCount() {
+        assertEquals(0, folderAdapter.itemCount)
+    }
+}

app/src/test/kotlin/fr/free/nrw/commons/customselector/ui/adapter/ImageAdapterTest.kt

@@ -0,0 +1,121 @@
+package fr.free.nrw.commons.customselector.ui.adapter
+
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.widget.GridLayout
+import fr.free.nrw.commons.R
+import fr.free.nrw.commons.TestCommonsApplication
+import fr.free.nrw.commons.customselector.listeners.ImageSelectListener
+import fr.free.nrw.commons.customselector.model.Image
+import fr.free.nrw.commons.customselector.ui.selector.CustomSelectorActivity
+import fr.free.nrw.commons.customselector.ui.selector.ImageLoader
+import org.junit.Before
+import org.junit.Test
+import org.junit.jupiter.api.Assertions
+import org.junit.runner.RunWith
+import org.mockito.*
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import java.lang.reflect.Field
+
+/**
+ * Custom Selector image adapter test.
+ */
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [21], application = TestCommonsApplication::class)
+class ImageAdapterTest {
+    @Mock
+    private lateinit var image: Image
+    @Mock
+    private lateinit var imageLoader: ImageLoader
+    @Mock
+    private lateinit var imageSelectListener: ImageSelectListener
+
+    private lateinit var activity: CustomSelectorActivity
+    private lateinit var imageAdapter: ImageAdapter
+    private lateinit var images : ArrayList<Image>
+    private lateinit var holder: ImageAdapter.ImageViewHolder
+    private lateinit var selectedImageField: Field
+
+    /**
+     * Set up variables.
+     */
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        activity = Robolectric.buildActivity(CustomSelectorActivity::class.java).get()
+        imageAdapter = ImageAdapter(activity, imageSelectListener, imageLoader)
+        images = ArrayList()
+
+        val inflater = activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
+        val listItemView: View = inflater.inflate(R.layout.item_custom_selector_image, null, false)
+        holder = ImageAdapter.ImageViewHolder(listItemView)
+
+        selectedImageField = imageAdapter.javaClass.getDeclaredField("selectedImages")
+        selectedImageField.isAccessible = true
+    }
+
+    /**
+     * Test on create view holder.
+     */
+    @Test
+    fun onCreateViewHolder() {
+        imageAdapter.createViewHolder(GridLayout(activity), 0)
+    }
+
+    /**
+     * Test on bind view holder.
+     */
+    @Test
+    fun onBindViewHolder() {
+        // Parameters.
+        images.add(image)
+        imageAdapter.init(images)
+
+        // Test conditions.
+        imageAdapter.onBindViewHolder(holder, 0)
+        selectedImageField.set(imageAdapter, images)
+        imageAdapter.onBindViewHolder(holder, 0)
+    }
+
+    /**
+     * Test init.
+     */
+    @Test
+    fun init() {
+        imageAdapter.init(images)
+    }
+
+    /**
+     * Test private function select or remove image.
+     */
+    @Test
+    fun selectOrRemoveImage() {
+        // Access function
+        val func = imageAdapter.javaClass.getDeclaredMethod("selectOrRemoveImage", ImageAdapter.ImageViewHolder::class.java, Int::class.java)
+        func.isAccessible = true
+
+        // Parameters
+        images.addAll(listOf(image, image))
+        imageAdapter.init(images)
+
+        // Test conditions
+        holder.itemUploaded()
+        func.invoke(imageAdapter, holder, 0)
+        holder.itemNotUploaded()
+        func.invoke(imageAdapter, holder, 0)
+        selectedImageField.set(imageAdapter, images)
+        func.invoke(imageAdapter, holder, 1)
+    }
+
+    /**
+     * Test get item count.
+     */
+    @Test
+    fun getItemCount() {
+        Assertions.assertEquals(0, imageAdapter.itemCount)
+    }
+}