all matcher

Use the all matcher to specify that a collection’s objects all pass an expected matcher. This works on any enumerable object.

    expect([1, 3, 5]).to all( be_odd )
    expect([1, 3, 5]).to all( be_an(Integer) )
    expect([1, 3, 5]).to all( be < 10 )
    expect([1, 3, 4]).to all( be_odd ) # fails

The matcher also supports compound matchers:

    expect([1, 3, 5]).to all( be_odd.and be < 10 )
    expect([1, 4, 21]).to all( be_odd.or be < 10 )

If you are looking for “any” member of a collection that passes an expectation, look at the include-matcher.

Array usage

Given a file named “arrayallmatcher_spec.rb” with:

RSpec.describe [1, 3, 5] do
  it { is_expected.to all( be_odd ) }
  it { is_expected.to all( be_an(Integer) ) }
  it { is_expected.to all( be < 10 ) }

  # deliberate failures
  it { is_expected.to all( be_even ) }
  it { is_expected.to all( be_a(String) ) }
  it { is_expected.to all( be > 2 ) }
end

When I run rspec array_all_matcher_spec.rb

Then the output should contain all of these:
6 examples, 3 failures
expected [1, 3, 5] to all be even
expected [1, 3, 5] to all be a kind of String
expected [1, 3, 5] to all be > 2

Compound matcher usage

Given a file named “compoundallmatcher_spec.rb” with:

RSpec.describe ['anything', 'everything', 'something'] do
  it { is_expected.to all( be_a(String).and include("thing") ) }
  it { is_expected.to all( be_a(String).and end_with("g") ) }
  it { is_expected.to all( start_with("s").or include("y") ) }

  # deliberate failures
  it { is_expected.to all( include("foo").and include("bar") ) }
  it { is_expected.to all( be_a(String).and start_with("a") ) }
  it { is_expected.to all( start_with("a").or include("z") ) }
end

When I run rspec compound_all_matcher_spec.rb

Then the output should contain all of these:
6 examples, 3 failures
expected [“anything”, “everything”, “something”] to all include “foo” and include “bar”
expected [“anything”, “everything”, “something”] to all be a kind of String and start with “a”
expected [“anything”, “everything”, “something”] to all start with “a” or include “z”