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diff --git a/src/test/kotlin/net/pterodactylus/sone/data/AlbumTest.kt b/src/test/kotlin/net/pterodactylus/sone/data/AlbumTest.kt
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+++ b/src/test/kotlin/net/pterodactylus/sone/data/AlbumTest.kt
@@ -0,0 +1,136 @@
+/**
+ * Sone - AlbumTest.kt - Copyright © 2019–2020 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.data
+
+import net.pterodactylus.sone.data.impl.*
+import org.hamcrest.MatcherAssert.*
+import org.hamcrest.Matchers.*
+import kotlin.test.*
+
+/**
+ * Unit test for various helper method in `Album.kt`.
+ */
+class AlbumTest {
+
+	@Test
+	fun `recursive list of all images for album is returned correctly`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val firstNestedAlbum = AlbumImpl(sone)
+		val secondNestedAlbum = AlbumImpl(sone)
+		firstNestedAlbum.addImage(createImage(sone, "image-1"))
+		firstNestedAlbum.addImage(createImage(sone, "image-2"))
+		secondNestedAlbum.addImage(createImage(sone, "image-3"))
+		album.addImage(createImage(sone, "image-4"))
+		album.addAlbum(firstNestedAlbum)
+		album.addAlbum(secondNestedAlbum)
+		val images = album.allImages
+		assertThat(images.map(Image::id), containsInAnyOrder("image-1", "image-2", "image-3", "image-4"))
+	}
+
+	private fun createImage(sone: IdOnlySone, id: String, key: String? = null) = ImageImpl(id).modify().setSone(sone).setKey(key).update()
+
+	@Test
+	fun `allAlbums returns itself and all its subalbums`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val firstNestedAlbum = AlbumImpl(sone)
+		val secondNestedAlbum = AlbumImpl(sone)
+		val albumNestedInFirst = AlbumImpl(sone)
+		album.addAlbum(firstNestedAlbum)
+		album.addAlbum(secondNestedAlbum)
+		firstNestedAlbum.addAlbum(albumNestedInFirst)
+		val albums = album.allAlbums
+		assertThat(albums, containsInAnyOrder<Album>(album, firstNestedAlbum, secondNestedAlbum, albumNestedInFirst))
+		assertThat(albums.indexOf(firstNestedAlbum), greaterThan(albums.indexOf(album)))
+		assertThat(albums.indexOf(secondNestedAlbum), greaterThan(albums.indexOf(album)))
+		assertThat(albums.indexOf(albumNestedInFirst), greaterThan(albums.indexOf(firstNestedAlbum)))
+	}
+
+	@Test
+	fun `notEmpty finds album without images is empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		assertThat(notEmpty(album), equalTo(false))
+	}
+
+	@Test
+	fun `notEmpty finds album with one inserted image is not empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		album.addImage(createImage(sone, "1", "key"))
+		assertThat(notEmpty(album), equalTo(true))
+	}
+
+	@Test
+	fun `notEmpty finds album with one not-inserted image is empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		album.addImage(createImage(sone, "1"))
+		assertThat(notEmpty(album), equalTo(false))
+	}
+
+	@Test
+	fun `notEmpty finds album with empty subalbums is empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val firstNestedAlbum = AlbumImpl(sone)
+		album.addAlbum(firstNestedAlbum)
+		assertThat(notEmpty(album), equalTo(false))
+	}
+
+	@Test
+	fun `notEmpty finds album with subalbum with not inserted image is empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val firstNestedAlbum = AlbumImpl(sone)
+		firstNestedAlbum.addImage(createImage(sone, "1"))
+		album.addAlbum(firstNestedAlbum)
+		assertThat(notEmpty(album), equalTo(false))
+	}
+
+	@Test
+	fun `notEmpty finds album with subalbum with inserted image is not empty`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val firstNestedAlbum = AlbumImpl(sone)
+		firstNestedAlbum.addImage(createImage(sone, "1", "key"))
+		album.addAlbum(firstNestedAlbum)
+		assertThat(notEmpty(album), equalTo(true))
+	}
+
+	@Test
+	fun `allImages returns images from album`() {
+		val sone = IdOnlySone("sone")
+		val album = AlbumImpl(sone)
+		val image1 = createImage(sone, "1").also(album::addImage)
+		val image2 = createImage(sone, "2").also(album::addImage)
+		assertThat(album.allImages, contains(image1, image2))
+	}
+
+	@Test
+	fun `allImages returns images from subalbum`() {
+		val sone = IdOnlySone("sone")
+		val album1 = AlbumImpl(sone)
+		val album2 = AlbumImpl(sone).also(album1::addAlbum)
+		val image1 = createImage(sone, "1").also(album1::addImage)
+		val image2 = createImage(sone, "2").also(album2::addImage)
+		assertThat(album1.allImages, contains(image1, image2))
+	}
+
+}