test for the digest utility module

[mobile-ledger.git] / app / src / test / java / net / ktnx / mobileledger / DigestUnitTest.java

diff --git a/app/src/test/java/net/ktnx/mobileledger/DigestUnitTest.java b/app/src/test/java/net/ktnx/mobileledger/DigestUnitTest.java
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+++ b/app/src/test/java/net/ktnx/mobileledger/DigestUnitTest.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright © 2018 Damyan Ivanov.
+ * This file is part of Mobile-Ledger.
+ * Mobile-Ledger is free software: you can distribute it and/or modify it
+ * under the term of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your opinion), any later version.
+ *
+ * Mobile-Ledger is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License terms for details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.ktnx.mobileledger;
+
+import net.ktnx.mobileledger.utils.Digest;
+
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class DigestUnitTest {
+    @Test
+    public void digestToHexString_isCorrect() {
+        assertEquals('0', Digest.hexDigitFor(0));
+        assertEquals('1', Digest.hexDigitFor(1));
+        assertEquals('2', Digest.hexDigitFor(2));
+        assertEquals('3', Digest.hexDigitFor(3));
+        assertEquals('4', Digest.hexDigitFor(4));
+        assertEquals('5', Digest.hexDigitFor(5));
+        assertEquals('6', Digest.hexDigitFor(6));
+        assertEquals('7', Digest.hexDigitFor(7));
+        assertEquals('8', Digest.hexDigitFor(8));
+        assertEquals('9', Digest.hexDigitFor(9));
+        assertEquals('a', Digest.hexDigitFor(10));
+        assertEquals('b', Digest.hexDigitFor(11));
+        assertEquals('c', Digest.hexDigitFor(12));
+        assertEquals('d', Digest.hexDigitFor(13));
+        assertEquals('e', Digest.hexDigitFor(14));
+        assertEquals('f', Digest.hexDigitFor(15));
+    }
+    @Test
+    public void hexDigitsFor_isCorrect() {
+        assertEquals("00", String.valueOf(Digest.hexDigitsFor(0)));
+        assertEquals("10", String.valueOf(Digest.hexDigitsFor(16)));
+        assertEquals("ff", String.valueOf(Digest.hexDigitsFor(255)));
+        assertEquals("a0", String.valueOf(Digest.hexDigitsFor(160)));
+        assertEquals("10", String.valueOf(Digest.hexDigitsFor((byte) 16)));
+        assertEquals("ff", String.valueOf(Digest.hexDigitsFor((byte) -1)));
+    }
+    @Test(expected = ArithmeticException.class)
+    public void digestToHexString_throwsOnNegative() {
+        Digest.hexDigitFor(-1);
+    }
+    @Test(expected = ArithmeticException.class)
+    public void digestToHexString_throwsOnGreaterThan15() {
+        Digest.hexDigitFor(16);
+    }
+    @Test(expected = ArithmeticException.class)
+    public void hexDigitsFor_throwsOnNegative() {
+        final char[] chars = Digest.hexDigitsFor(-5);
+    }
+    @Test(expected = ArithmeticException.class)
+    public void hexDigitsFor_throwsOnGreatherThan255() {
+        final char[] chars = Digest.hexDigitsFor(256);
+    }
+}
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