Tests: Copy the new EdDSA test vectors

to where the classloader can find them.
Throw a better error message if not found.

core/java/build.xml

@@ -125,6 +125,13 @@
             </classpath>
             <compilerarg line="${javac.compilerargs}" />
         </javac>
+        <!-- EdDSA test vectors -->
+        <copy todir="./build/obj">
+            <fileset dir="./test/junit/">
+                <include name="net/i2p/crypto/eddsa/math/baseDblPrecmp"/>
+                <include name="net/i2p/crypto/eddsa/math/basePrecmp"/>
+            </fileset>
+        </copy>
     </target>
     <!-- jars with tests -->
     <target name="jarScalaTest" depends="scalatest.compileTest">
@@ -144,7 +151,10 @@
         <jar destfile="./build/i2pscalatest.jar" basedir="./build/obj_scala_jar" includes="**/*.class" />
     </target>
     <target name="jarTest" depends="junit.compileTest">
-        <jar destfile="./build/i2ptest.jar" basedir="./build/obj" includes="**/*.class" />
+        <!-- warning - The junit.test target below doesn't actually include i2ptest.jar in the classpath,
+             only the build/obj directory.
+          -->
+        <jar destfile="./build/i2ptest.jar" basedir="./build/obj" includes="**/*.class **/baseDblPrecmp **/basePrecmp" />
     </target>
     <!-- preparation of code coverage tool of choice -->
     <target name="prepareClover" depends="compile" if="with.clover">

core/java/test/junit/net/i2p/crypto/eddsa/math/PrecomputationTestVectors.java

@@ -2,6 +2,7 @@ package net.i2p.crypto.eddsa.math;
 
 import java.io.BufferedReader;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
 
 import net.i2p.crypto.eddsa.Utils;
@@ -22,8 +23,10 @@ public class PrecomputationTestVectors {
         BufferedReader file = null;
         int row = 0, col = 0;
         try {
-            file = new BufferedReader(new InputStreamReader(
-                    PrecomputationTestVectors.class.getResourceAsStream(fileName)));
+            InputStream is = PrecomputationTestVectors.class.getResourceAsStream(fileName);
+            if (is == null)
+                throw new IOException("Resource not found: " + fileName);
+            file = new BufferedReader(new InputStreamReader(is));
             String line;
             while ((line = file.readLine()) != null) {
                 if (line.equals(" },"))