Add reproducer for yegor256#577

src/test/java/org/takes/rq/multipart/RqMtFakeTest.java

@@ -24,14 +24,21 @@
 package org.takes.rq.multipart;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.nio.channels.ClosedChannelException;
 import java.util.Arrays;
 import java.util.HashSet;
+import java.util.LinkedList;
+
+import org.cactoos.io.InputOf;
+import org.cactoos.list.ListOf;
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.hamcrest.core.IsInstanceOf;
 import org.junit.Assert;
+import org.junit.Ignore;
 import org.junit.Test;
+import org.takes.Request;
 import org.takes.rq.RqFake;
 import org.takes.rq.RqHeaders;
 import org.takes.rq.RqMultipart;
@@ -343,6 +350,29 @@ public void returnsCorrectNamesSet() throws IOException {
         }
     }
 
+    /*
+     * @todo #577:30min The test below fails with the message
+     *  "header "Content-Disposition" is mandatory".
+     *  The error disappears when `new RqFake(new ListOf<>(""), "")` is
+     *  changed to `new RqFake(new ListOf<>(""), "someValue")`.
+     *  Fix the underlying problem and remove the `@Ignore` annotation.
+     * */
+    @Test
+    @Ignore("See puzzle above")
+    public void contentDispositionShouldBeRecognized() throws IOException {
+        new RqMtFake(
+            new RqFake(),
+            new RqWithHeader(
+                new RqFake(new ListOf<>(""), ""),
+                contentDispositionHeader("form-data; name=\"field1\"")
+            ),
+            new RqWithHeader(
+                new RqFake("", "", "field2Value"),
+                contentDispositionHeader("form-data; name=\"field2\"")
+            )
+        );
+    }
+
     /**
      * Format Content-Disposition header.
      * @param dsp Disposition