Add unit test on DefaultPassphraseGenerator

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/keys/DefaultPassphraseGeneratorTest.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.impl.keys
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+
+@RunWith(RobolectricTestRunner::class)
+class DefaultPassphraseGeneratorTest {
+    @Test
+    fun `check that generated passphrase has the expected length`() {
+        val passphraseGenerator = DefaultPassphraseGenerator()
+        val passphrase = passphraseGenerator.generatePassphrase()
+        assertThat(passphrase!!.length).isEqualTo(342)
+    }
+}