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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Hash#to_proc" do
before :each do
@key = Object.new
@value = Object.new
@hash = { @key => @value }
@default = Object.new
@unstored = Object.new
end
it "returns an instance of Proc" do
@hash.to_proc.should be_an_instance_of Proc
end
describe "the returned proc" do
before :each do
@proc = @hash.to_proc
end
ruby_version_is ""..."2.8" do
it "is not a lambda" do
@proc.should_not.lambda?
end
end
ruby_version_is "2.8" do
it "is a lambda" do
@proc.should.lambda?
end
end
it "raises ArgumentError if not passed exactly one argument" do
-> {
@proc.call
}.should raise_error(ArgumentError)
-> {
@proc.call 1, 2
}.should raise_error(ArgumentError)
end
context "with a stored key" do
it "returns the paired value" do
@proc.call(@key).should equal(@value)
end
end
context "passed as a block" do
it "retrieves the hash's values" do
[@key].map(&@proc)[0].should equal(@value)
end
context "to instance_exec" do
it "always retrieves the original hash's values" do
hash = {foo: 1, bar: 2}
proc = hash.to_proc
hash.instance_exec(:foo, &proc).should == 1
hash2 = {quux: 1}
hash2.instance_exec(:foo, &proc).should == 1
end
end
end
context "with no stored key" do
it "returns nil" do
@proc.call(@unstored).should be_nil
end
context "when the hash has a default value" do
before :each do
@hash.default = @default
end
it "returns the default value" do
@proc.call(@unstored).should equal(@default)
end
end
context "when the hash has a default proc" do
it "returns an evaluated value from the default proc" do
@hash.default_proc = -> hash, called_with { [hash.keys, called_with] }
@proc.call(@unstored).should == [[@key], @unstored]
end
end
end
it "raises an ArgumentError when calling #call on the Proc with no arguments" do
-> { @hash.to_proc.call }.should raise_error(ArgumentError)
end
end
end
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