Add some Konsist test.

app/src/test/kotlin/io/element/android/app/KonsistTest.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * 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 io.element.android.app
+
+import com.lemonappdev.konsist.api.Konsist
+import com.lemonappdev.konsist.api.ext.list.withAllAnnotationsOf
+import com.lemonappdev.konsist.api.ext.list.withAllParentsOf
+import com.lemonappdev.konsist.api.verify.assertTrue
+import io.element.android.libraries.architecture.Presenter
+import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import org.junit.Test
+
+class KonsistTest {
+
+    @Test
+    fun `classes extending 'Presenter' should have 'Presenter' suffix`() {
+        Konsist.scopeFromProject()
+            .classes()
+            .withAllParentsOf(Presenter::class)
+            .assertTrue { it.name.endsWith("Presenter") }
+    }
+
+    @Test
+    fun `function with '@PreviewsDayNight' annotation should have 'Preview' suffix`() {
+        Konsist
+            .scopeFromProject()
+            .functions()
+            .withAllAnnotationsOf(PreviewsDayNight::class)
+            .assertTrue {
+                it.hasNameEndingWith("Preview") &&
+                    it.hasNameEndingWith("LightPreview").not() &&
+                    it.hasNameEndingWith("DarkPreview").not()
+            }
+    }
+}