yegor256#47 added logging level to cookie

added unit test

src/main/java/org/takes/facets/flash/RsFlash.java

@@ -23,7 +23,9 @@
  */
 package org.takes.facets.flash;
 
+import java.nio.charset.Charset;
 import java.util.logging.Level;
+import javax.xml.bind.DatatypeConverter;
 import lombok.EqualsAndHashCode;
 import org.takes.rs.RsWithCookie;
 import org.takes.rs.RsWrap;
@@ -32,7 +34,6 @@
  * Forwarding response.
  *
  * <p>The class is immutable and thread-safe.
- *
  * @author Yegor Bugayenko (yegor@teamed.io)
  * @version $Id$
  * @since 0.1
@@ -72,8 +73,17 @@ public RsFlash(final String msg, final Level level) {
      * @param cookie Cookie name
      */
     public RsFlash(final String msg, final Level level, final String cookie) {
-        super(new RsWithCookie(cookie, msg));
-        assert level != null;
+        super(
+            new RsWithCookie(
+                cookie,
+                DatatypeConverter.printBase64Binary(
+                    new StringBuilder(level.getName())
+                        .append('/')
+                        .append(msg).toString()
+                        .getBytes(Charset.defaultCharset())
+            )
+        )
+        );
     }
 
 }

src/test/java/org/takes/facets/flash/RsFlashTest.java

@@ -0,0 +1,74 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Yegor Bugayenko
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.takes.facets.flash;
+
+import com.google.common.base.Joiner;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.logging.Level;
+import javax.xml.bind.DatatypeConverter;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import org.takes.rs.RsPrint;
+
+/**
+ * Test case for {@link RsFlash}.
+ * @author Dmitry Zaytsev (dmitry.zaytsev@gmail.com)
+ * @version $Id$
+ * @since 0.9.10
+ */
+public final class RsFlashTest {
+    /**
+     * RsFlash can make cookie with message.
+     * @throws IOException If some problem inside
+     */
+    @Test
+    public void makeCookie() throws IOException {
+        final String msg = "message";
+        MatcherAssert.assertThat(
+            new RsPrint(
+                new RsFlash(msg, Level.INFO, RsFlashTest.class.getSimpleName())
+            ).print(),
+            Matchers.equalTo(
+                Joiner.on("\r\n").join(
+                    "HTTP/1.1 200 OK",
+                    new StringBuilder("Set-Cookie: ")
+                        .append(RsFlashTest.class.getSimpleName())
+                        .append('=')
+                        .append(
+                            DatatypeConverter.printBase64Binary(
+                                new StringBuilder(Level.INFO.getName())
+                                    .append('/')
+                                    .append(msg).toString()
+                                    .getBytes(Charset.defaultCharset())
+                            )
+                        ),
+                    "",
+                    ""
+                )
+            )
+        );
+    }
+}