Add unit test on DefaultFeaturesProvider.

libraries/featureflag/impl/src/test/kotlin/io/element/android/libraries/featureflag/impl/DefaultFeaturesProviderTest.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.featureflag.impl
+
+import com.google.common.truth.Truth.assertThat
+import io.element.android.libraries.featureflag.api.FeatureFlags
+import org.junit.Test
+
+class DefaultFeaturesProviderTest {
+    @Test
+    fun `provide should return all features`() {
+        val provider = DefaultFeaturesProvider()
+        val features = provider.provide()
+        assertThat(features.size).isEqualTo(FeatureFlags.entries.size)
+        FeatureFlags.entries.forEach {
+            assertThat(features.contains(it)).isTrue()
+        }
+    }
+}