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module RSpec
module Matchers
RSpec.describe "expect(actual).to be_within(delta).of(expected)" do
it_behaves_like "an RSpec value matcher", :valid_value => 5, :invalid_value => -5 do
let(:matcher) { be_within(2).of(4.0) }
end
it "passes when actual == expected" do
expect(5.0).to be_within(0.5).of(5.0)
end
it "passes when actual < (expected + delta)" do
expect(5.49).to be_within(0.5).of(5.0)
end
it "passes when actual > (expected - delta)" do
expect(4.51).to be_within(0.5).of(5.0)
end
it "passes when actual == (expected - delta)" do
expect(4.5).to be_within(0.5).of(5.0)
end
it "passes when actual == (expected + delta)" do
expect(5.5).to be_within(0.5).of(5.0)
end
it "passes with integer arguments that are near each other" do
expect(1.0001).to be_within(5).percent_of(1)
end
it "passes with negative arguments" do
expect(-1.0001).to be_within(5).percent_of(-1)
end
it "fails when actual < (expected - delta)" do
expect {
expect(4.49).to be_within(0.5).of(5.0)
}.to fail_with("expected 4.49 to be within 0.5 of 5.0")
end
it "fails when actual > (expected + delta)" do
expect {
expect(5.51).to be_within(0.5).of(5.0)
}.to fail_with("expected 5.51 to be within 0.5 of 5.0")
end
it "works with Time" do
expect(Time.now).to be_within(0.1).of(Time.now)
end
it "provides a description" do
matcher = be_within(0.5).of(5.0)
matcher.matches?(5.1)
expect(matcher.description).to eq "be within 0.5 of 5.0"
end
it "formats expected within description" do
klass = Class.new { def inspect; "5"; end }
matcher = be_within(0.5).of(klass.new)
expect(matcher.description).to eq "be within 0.5 of 5"
end
it "raises an error if no expected value is given" do
expect {
expect(5.1).to be_within(0.5)
}.to raise_error(ArgumentError, /must set an expected value using #of/)
end
it "fails if the actual is not numeric" do
expect {
expect(nil).to be_within(0.1).of(0)
}.to fail_with("expected nil to be within 0.1 of 0, but it could not be treated as a numeric value")
end
end
RSpec.describe "expect(actual).to be_within(delta).percent_of(expected)" do
it "passes when actual is within the given percent variance" do
expect(9.0).to be_within(10).percent_of(10.0)
expect(10.0).to be_within(10).percent_of(10.0)
expect(11.0).to be_within(10).percent_of(10.0)
end
it "fails when actual is outside the given percent variance" do
expect {
expect(8.9).to be_within(10).percent_of(10.0)
}.to fail_with("expected 8.9 to be within 10% of 10.0")
expect {
expect(11.1).to be_within(10).percent_of(10.0)
}.to fail_with("expected 11.1 to be within 10% of 10.0")
end
it "provides a description" do
matcher = be_within(0.5).percent_of(5.0)
matcher.matches?(5.1)
expect(matcher.description).to eq "be within 0.5% of 5.0"
end
it "works with custom measure objects" do
weight_class = Struct.new(:val) do
include Comparable
def <=>(other); val <=> other.val; end
def -(other); self.class.new(val - other.val); end
def abs; self.class.new(val.abs); end
def *(numeric); self.class.new(val * numeric); end
def /(numeric); self.class.new(val / numeric); end
end
expect(weight_class.new(99)).to be_within(2).percent_of(weight_class.new(100))
expect {
expect(weight_class.new(90)).to be_within(2).percent_of(weight_class.new(100))
}.to fail_with(/expected #<struct.*val=90> to be within 2% of #<struct.*val=100>/)
end
end
RSpec.describe "expect(actual).not_to be_within(delta).of(expected)" do
it "passes when actual < (expected - delta)" do
expect(4.49).not_to be_within(0.5).of(5.0)
end
it "passes when actual > (expected + delta)" do
expect(5.51).not_to be_within(0.5).of(5.0)
end
it "fails when actual == expected" do
expect {
expect(5.0).not_to be_within(0.5).of(5.0)
}.to fail_with("expected 5.0 not to be within 0.5 of 5.0")
end
it "fails when actual < (expected + delta)" do
expect {
expect(5.49).not_to be_within(0.5).of(5.0)
}.to fail_with("expected 5.49 not to be within 0.5 of 5.0")
end
it "fails when actual > (expected - delta)" do
expect {
expect(4.51).not_to be_within(0.5).of(5.0)
}.to fail_with("expected 4.51 not to be within 0.5 of 5.0")
end
it "fails when actual == (expected - delta)" do
expect {
expect(4.5).not_to be_within(0.5).of(5.0)
}.to fail_with("expected 4.5 not to be within 0.5 of 5.0")
end
it "fails when actual == (expected + delta)" do
expect {
expect(5.5).not_to be_within(0.5).of(5.0)
}.to fail_with("expected 5.5 not to be within 0.5 of 5.0")
end
it "passes if the actual is not numeric" do
expect(nil).not_to be_within(0.1).of(0)
end
end
end
end
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