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new assertion: assert_blank

Signed-off-by: Xavier Noria <fxn@hashref.com>
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commit ccb1beeb5bf722d6951fa0b5bf2b9932af3593f8 1 parent ea6ef76
@xuanxu xuanxu authored fxn committed
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7 activesupport/lib/active_support/testing/assertions.rb
@@ -60,6 +60,13 @@ def assert_difference(expression, difference = 1, message = nil, &block)
def assert_no_difference(expression, message = nil, &block)
assert_difference expression, 0, message, &block
end
+
+ # Test if an expression is blank. Passes if object.blank? is true.
+ #
+ # assert_blank [] # => true
+ def assert_blank(object)
+ assert object.blank?, "#{object.inspect} is not blank"
+ end
end
end
end
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28 activesupport/test/test_test.rb
@@ -85,6 +85,34 @@ def default_test; end
end
end
+class EmptyTrue
+ def empty?() true; end
+end
+
+class EmptyFalse
+ def empty?() false; end
+end
+
+class AssertBlankTest < ActiveSupport::TestCase
+ BLANK = [ EmptyTrue.new, nil, false, '', ' ', " \n\t \r ", [], {} ]
+ NOT_BLANK = [ EmptyFalse.new, Object.new, true, 0, 1, 'j', [nil], { nil => 0 } ]
+
+ def test_assert_blank_true
+ BLANK.each { |v| assert_blank v }
+ end
+
+ def test_assert_blank_false
+ NOT_BLANK.each { |v|
+ begin
+ assert_blank v
+ fail 'should not get to here'
+ rescue Exception => e
+ assert_match(/is not blank/, e.message)
+ end
+ }
+ end
+end
+
# These should always pass
if ActiveSupport::Testing.const_defined?(:Default)
class NotTestingThingsTest < Test::Unit::TestCase
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