added test for security extension function

app/src/androidTest/java/com/example/sw0b_001/SecurityExtensionsTest.kt

@@ -0,0 +1,52 @@
+package com.example.sw0b_001
+
+import android.content.Context
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.example.sw0b_001.extensions.context.generateSecureRandom
+import com.example.sw0b_001.extensions.context.settingsGetDbPassword
+import com.example.sw0b_001.extensions.context.settingsSetDbPassword
+import org.junit.Assert.*
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class SecurityExtensionsTest {
+
+    @Test
+    fun generateSecureRandom_returns32Bytes() {
+
+        val context = ApplicationProvider.getApplicationContext<Context>()
+
+        val result = context.generateSecureRandom()
+
+        assertEquals(32, result.size)
+    }
+
+    @Test
+    fun generateSecureRandom_returnsDifferentValues() {
+
+        val context = ApplicationProvider.getApplicationContext<Context>()
+
+        val first = context.generateSecureRandom()
+        val second = context.generateSecureRandom()
+
+        assertFalse(first.contentEquals(second))
+    }
+
+    @Test
+    fun settingsSetDbPassword_savesAndReturnsPassword() {
+
+        val context = ApplicationProvider.getApplicationContext<Context>()
+
+        val password = "my_secret_password".toByteArray()
+
+        context.settingsSetDbPassword(password)
+
+        val savedPassword = context.settingsGetDbPassword
+
+        assertNotNull(savedPassword)
+
+        assertArrayEquals(password, savedPassword)
+    }
+}