Add Numeric9x4PassphraseUtils

OpenKeychain/src/test/java/org/sufficientlysecure/keychain/util/Numeric9x4PassphraseUtilTest.java

@@ -0,0 +1,40 @@
+package org.sufficientlysecure.keychain.util;
+
+
+import java.util.Random;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+
+public class Numeric9x4PassphraseUtilTest {
+    private static final int RANDOM_SEED = 12345;
+    private static final String TRANSFER_CODE_3x3x4 = "1018-5452-1972-0624-7325-1126-8153-1997-1535";
+
+    @Test
+    public void generateNumeric9x4Passphrase() {
+        Random r = new Random(RANDOM_SEED);
+
+        Passphrase passphrase = Numeric9x4PassphraseUtil.generateNumeric9x4Passphrase(r);
+
+        assertEquals(TRANSFER_CODE_3x3x4, passphrase.toStringUnsafe());
+    }
+
+    @Test
+    public void isNumeric9x4Passphrase() {
+        boolean isValidCodeLayout = Numeric9x4PassphraseUtil.isNumeric9x4Passphrase(TRANSFER_CODE_3x3x4);
+
+        assertTrue(isValidCodeLayout);
+    }
+
+
+    @Test
+    public void isNumeric9x4Passphrase_withBadSuffix() {
+        boolean isValidCodeLayout = Numeric9x4PassphraseUtil.isNumeric9x4Passphrase(TRANSFER_CODE_3x3x4 + "x");
+
+        assertFalse(isValidCodeLayout);
+    }
+}