Init Base64 test encoder for unit-tests

The previous approach with

testCompile project("smack-java7")

was flawed. Instead we setup a Base64 encoder especially for the unit
tests now.

smack-core/src/test/java/org/jivesoftware/smack/test/util/SmackTestSuite.java

@@ -0,0 +1,97 @@
+/**
+ *
+ * Copyright © 2014 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.test.util;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+
+import net.iharder.Base64;
+
+import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.stringencoder.Base64.Encoder;
+import org.junit.runners.Suite;
+import org.junit.runners.model.InitializationError;
+import org.junit.runners.model.RunnerBuilder;
+
+/**
+ * The SmackTestSuite takes care of initializing Smack for the unit tests. For example the Base64
+ * encoder is configured.
+ */
+public class SmackTestSuite extends Suite {
+
+    public SmackTestSuite(Class<?> klass, RunnerBuilder builder) throws InitializationError {
+        super(klass, builder);
+
+        init();
+    }
+
+    public static void init() {
+        org.jivesoftware.smack.util.stringencoder.Base64.setEncoder(new Encoder() {
+
+            @Override
+            public byte[] decode(String string) {
+                try {
+                    return Base64.decode(string);
+                }
+                catch (IllegalArgumentException e) {
+                    // Expected by e.g. the unit test.
+                    // " Base64-encoded string must have at least four characters, but length specified was 1",
+                    // should not cause an exception, but instead null should be returned. Maybe
+                    // this should be changed in a later Smack release, so that the actual exception
+                    // is handled.
+                    return null;
+                }
+                catch (IOException e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+
+            @Override
+            public byte[] decode(byte[] input, int offset, int len) {
+                try {
+                    return Base64.decode(input, offset, len, 0);
+                }
+                catch (IllegalArgumentException e) {
+                    // Expected by e.g. the unit test.
+                    // " Base64-encoded string must have at least four characters, but length specified was 1",
+                    // should not cause an exception, but instead null should be returned. Maybe
+                    // this should be changed in a later Smack release, so that the actual exception
+                    // is handled.
+                    return null;
+                } catch (IOException e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+
+            @Override
+            public String encodeToString(byte[] input, int offset, int len) {
+                return Base64.encodeBytes(input, offset, len);
+            }
+
+            @Override
+            public byte[] encode(byte[] input, int offset, int len) {
+                String string = encodeToString(input, offset, len);
+                try {
+                    return string.getBytes(StringUtils.USASCII);
+                } catch (UnsupportedEncodingException e) {
+                    throw new AssertionError(e);
+                }
+            }
+
+        });
+    }
+}