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Stored size: 1.71 KB
Contents
require File.join(File.dirname(__FILE__), "/spec_helper")
require 'fixed_range'
describe FixedRange, "initialize" do
it "should take three paramaters, a min, max, and step_size" do
lambda{@f = FixedRange.new(1,5,1)}.should_not raise_error
@f.min.should eql(1)
@f.max.should eql(5)
@f.step_size.should eql(1)
end
it "should assume step of 1 if not given" do
FixedRange.new(1,5).step_size.should eql(1)
end
it "should straighten out min and max (no reverse ranges here)" do
@f = FixedRange.new(5,1)
@f.min.should eql(1)
@f.max.should eql(5)
end
end
describe FixedRange do
before(:each) do
@f = FixedRange.new(1,5)
end
it "should be able to step with an arbitrary step size" do
# 1.0 + 3.5
count_values(@f, 2.5).should eql(4.5)
# 1.0 + 1.5 + 2.0 ... 5.0
count_values(@f, 0.5).should eql(27.0)
count_values(@f, 5).should eql(1.0)
end
it "should expose each" do
sum = 0.0
@f.each {|x| sum += x}
sum.should eql(15.0)
end
it "should expose min and max" do
@f.min.should eql(1)
@f.max.should eql(5)
end
it "should expose size" do
@f.size.should eql(5.0)
end
it "should have an index lookup" do
@f[0].should eql(1)
@f[1].should eql(2)
@f[2].should eql(3)
@f[3].should eql(4)
@f[4].should eql(5)
lambda{@f[5].should eql(5)}.should raise_error
@f[-1].should eql(5)
@f[-2].should eql(4)
@f[-3].should eql(3)
@f[-4].should eql(2)
@f[-5].should eql(1)
end
end
def count_values(obj, step_size)
sum = 0.0
obj.step(step_size) {|x| sum += x}
return sum
end
# @f = FixedRange.new(1.0,5.0)
# @f.each {|x| puts x}
# puts @f.size, @f.min, @f.max
# @f.step(2.5) {|x| puts x}
Version data entries
16 entries across 16 versions & 1 rubygems