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copied!<p>My approach:</p> <pre><code>public void testRowsToBeRead(){ HashSet<SomeObject> expectedRows = new HasSet<SomeObject(); expectedRows.add(new SomeObject("abc")); expectedRows.add(new SomeObject("def")); HashSet<SomeObject> rows = new SomeObject().read(); // alternative 1 assertEquals(19, rows.size()); for(SomeObject r:rows){ if (!expectedRows.contains(r)) { // test failed } } // alternative 2 assertTrue(expectedRows.equals(rows)); } </code></pre> <p>To rely on this test you may need other unit tests confirming that <code>SomeObject</code>'s <code>equals</code> and <code>hashCode</code> methods work as they should be...</p> <p><strong>EDIT based on one of your comments</strong></p> <p>If you want to check for fields not part of the <code>equals</code> contract, you have to iterate through the set:</p> <pre><code>public void testRowsToBeRead(){ HashSet<SomeObject> expectedRows = new HasSet<SomeObject(); expectedRows.add(new SomeObject("a", "a1")); expectedRows.add(new SomeObject("b", "b1")); HashSet<SomeObject> rows = new SomeObject().read(); for(SomeObject r : rows) { SomeObject expected = expectedRows.get(r); // equals and hashCode must still match if (expected == null) { // failed } if (!expected.getField1().equals(r.getField1()) && !expected.getField2().equals(r.getField2())) { // failed } } } </code></pre> <p>In the above example <code>SomeObject</code>'s <code>equals</code> may look like this, it only checks for <code>field1</code>:</p> <pre><code>@Override public boolean equals(Object other) { return this.getField1().equals( ((SomeObject) other).getField1() ); } </code></pre> <p>No question, depending on your concrete use case this may become more complex. Hope this helps...</p>

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