Ruby – Rspec: “array.should == another_array” but without concern for order

rspecrubytesting

I often want to compare arrays and make sure that they contain the same elements, in any order. Is there a concise way to do this in RSpec?

Here are methods that aren't acceptable:

`#to_set`

For example:

expect(array.to_set).to eq another_array.to_set

array.to_set.should == another_array.to_set

This fails when the arrays contain duplicate items.

`#sort`

For example:

expect(array.sort).to eq another_array.sort

array.sort.should == another_array.sort

This fails when the arrays elements don't implement #<=>

Best Answer

Try array.should =~ another_array

The best documentation on this I can find is the code itself, which is here.

Related Solutions

Java – Best way to compare 2 XML documents in Java

Sounds like a job for XMLUnit

Example:

public class SomeTest extends XMLTestCase {
  @Test
  public void test() {
    String xml1 = ...
    String xml2 = ...

    XMLUnit.setIgnoreWhitespace(true); // ignore whitespace differences

    // can also compare xml Documents, InputSources, Readers, Diffs
    assertXMLEqual(xml1, xml2);  // assertXMLEquals comes from XMLTestCase
  }
}

Ruby – How to make –no-ri –no-rdoc the default for gem install

You just add the following line to your local ~/.gemrc file (it is in your home folder):

gem: --no-document

or you can add this line to the global gemrc config file.

Here is how to find it (in Linux):

strace gem source 2>&1 | grep gemrc

The --no-document option is documented in the RubyGems CLI Reference.

#to_set

#sort