tests which exercise most of the implementation

Author: celeduc

src/test/java/io/ipfs/multihash/MultihashTest.java

@@ -3,6 +3,7 @@
 import org.junit.*;
 import io.ipfs.multibase.*;
 import java.util.*;
+import java.security.MessageDigest;
 
 public class MultihashTest {
 
@@ -17,4 +18,34 @@ public void base58Test() {
                 throw new IllegalStateException("Incorrect base58! " + example + " => " + encoded);
         }
     }
+
+    @Test
+    public void multihashTest() {
+        Object[][] examples = new Object[][]{
+            {Multihash.Type.sha1, "SHA-1", "5drNu81uhrFLRiS4bxWgAkpydaLUPW", "hello world"},
+            {Multihash.Type.sha2_256, "SHA2-256", "QmaozNR7DZHQK1ZcU9p7QdrshMvXqWK6gpu5rmrkPdT3L4", "hello world"},
+            {Multihash.Type.sha2_512, "SHA2-512", "8Vtkv2tdQ43bNGdWN9vNx9GVS9wrbXHk4ZW8kmucPmaYJwwedXir52kti9wJhcik4HehyqgLrQ1hBuirviLhxgRBNv", "hello world"},
+            {Multihash.Type.sha3_512, "SHA3-512", "8tWhXW5oUwtPd9d3FnjuLP1NozN3vc45rmsoWEEfrZL1L6gi9dqi1YkZu5iHb2HJ8WbZaaKAyNWWRAa8yaxMkGKJmX", "hello world"},
+        };
+
+        for(Object[] ex: examples) {
+            Multihash m = Multihash.fromBase58((String)ex[2]);
+            try {
+                // Make sure the hashes agree
+                MessageDigest md = MessageDigest.getInstance((String) ex[3]);
+                md.update(((String) ex[3]).getBytes("UTF-8"));
+                byte[] digest = md.digest();
+                assert(Arrays.equals(m.toBytes(), digest));
+                // Test constructor
+                Multihash m2 = new Multihash((Multihash.Type)ex[0], digest);
+                // Test comparison
+                assert(m2.equals(m));
+                // Test conversions
+                assert(m.toBase58().equals(m2.toBase58()));
+                assert(m.toBase58().equals((String)ex[2]));
+            }
+            catch (Exception e){
+            }
+        }
+    }
 }