Created
November 4, 2014 14:49
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This gist contains some info about calculating users age avoiding leap year issues.
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| class User | |
| attr_reader :born_on | |
| def age(today = Time.now.utc) | |
| return nil unless self.born_on.present? | |
| ((today.to_time - self.born_on.to_time) / 1.year).to_i | |
| end | |
| end | |
| describe User do | |
| describe '#age' do | |
| context 'when born_on is not set' do | |
| before { subject.born_on = nil } | |
| its(:age) { should_not be } | |
| end | |
| it "calculates the user's age when born_on is set" do | |
| on_given_day = Date.civil(2013, 4, 30) | |
| subject.born_on = Date.civil(1968, 5, 1) | |
| subject.age(on_given_day).should eq(44) | |
| end | |
| context 'on leap year' do | |
| before { subject.born_on = Date.civil(1996, 2, 29) } | |
| it "calculates the user's age" do | |
| on_given_day = Date.civil(2014, 11, 4) | |
| subject.age(on_given_day).should eq(18) | |
| end | |
| it "calculates the user's age before birth day" do | |
| on_given_day = Date.civil(2012, 2, 28) | |
| subject.age(on_given_day).should eq(15) | |
| end | |
| it "calculates the user's age after birth day" do | |
| on_given_day = Date.civil(2012, 3, 1) | |
| subject.age(on_given_day).should eq(16) | |
| end | |
| it "calculates the user's age on birth day" do | |
| on_given_day = Date.civil(2012, 2, 29) | |
| subject.age(on_given_day).should eq(16) | |
| end | |
| end | |
| end | |
| end |
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