Added the `abort_execution` matcher

spec/support/matchers/abort_matcher.rb

+RSpec::Matchers.define :abort_execution do
+  match do |code_block|
+    @captured_stderr = StringIO.new
+    original_stderr = $stderr
+    $stderr = @captured_stderr
+
+    code_block.call
+
+    false
+  rescue SystemExit => e
+    captured = @captured_stderr.string.chomp
+    @actual_exit_code = e.status
+    break false unless e.status == 1
+
+    if @message
+      if @message.is_a? String
+        @message == captured
+      elsif @message.is_a? Regexp
+        @message.match?(captured)
+      else
+        raise ArgumentError, 'with_message must be either a String or a Regular Expression'
+      end
+    end
+
+  ensure
+    $stderr = original_stderr
+  end
+
+  chain :with_message do |message|
+    @message = message
+  end
+
+  failure_message do |block|
+    unless @actual_exit_code
+      break "expected #{block} to abort with '#{@message}' but didnt call abort."
+    end
+
+    if @actual_exit_code != 1
+      break "expected #{block} to abort with: '#{@message}' but exited with success instead."
+    end
+
+    "expected #{block} to abort with: '#{@message}' \n but received: '#{@captured_stderr.string.chomp}' instead."
+  end
+
+  supports_block_expectations
+end