Errors testing toString Java code

I am trying to write some test code for a "Book" class that gets and sets book information from other classes: ISBN (String), Title (String), Author (String), publishDate (SimpleDateFormat "MMM.dd.yyy"), Price (Double), and Summary content (Blob).When I try to run a toString test on all or part of the code (which I have changed the format and String that should be set countless times):

@Test
public void testToString() {
    Book testBook6 = new Book();
    Title testTitle6 = new Title("Title: Moby Dick, ");
    Author testAuthor6 = new Author("Author: Mark Twain, ");
    ISBN testISBN6 = new ISBN("ISBN: 000-00-000-0000-0");
    testBook6.setTitle(testTitle6);
    testBook6.setAuthor(testAuthor6);
    testBook6.setISBN(testISBN6);
    assertEquals("Title: Moby Dick, Author: Mark Twain, ISBN: 000-00-000-0000-0", testBook6.toString());        
}

I receive an error:

org.junit.ComparisonFailure: expected:<[Title: Moby Dick, Author: Mark Twain, ISBN: 000-00-000-0000-0]> but was:<[book.application.Book@48533e64]>
    at org.junit.Assert.assertEquals(Assert.java:115)
    at org.junit.Assert.assertEquals(Assert.java:144)
    at book.application.BookTest.testToString(BookTest.java:61)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

and when I try to run the code in my scrapbook:

Book testBook = new Book();
ISBN testISBN = new ISBN("ISBN: 000-00-000-0000-0");
Title testTitle = new Title("Title: Moby Dick, ");
Author testAuthor = new Author("Author: Mark Twain, ");
Date dNow = new Date( );
SimpleDateFormat ft = new SimpleDateFormat ("MMMM.dd.yyyy");
Price testPrice = new Price(2.25);
Blob testBlob = new Blob("Blah, Blah, Blah");

testBook.setISBN(testISBN);
testBook.setTitle(testTitle);
testBook.setAuthor(testAuthor);
testBook.setPrice(testPrice);
testBook.setBlob(testBlob);

System.out.println(testBook.toString());

to see what's going on, I can only get a return of "book.application.Book@1794d431", with numbers (such as 1794d431) that change randomly every time I run it. All tests pass for every class that "Book" gets and sets from, and no errors are marked. This is only my second Java project, so I am quite new to this; however, I seem to have hit a wall and could certainly use some help!

Thanks in advance!