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require_relative '../spec_helper'
describe "Safe navigator" do
it "requires a method name to be provided" do
-> { eval("obj&. {}") }.should raise_error(SyntaxError)
end
context "when context is nil" do
it "always returns nil" do
nil&.unknown.should == nil
[][10]&.unknown.should == nil
end
it "can be chained" do
nil&.one&.two&.three.should == nil
end
it "doesn't evaluate arguments" do
obj = Object.new
obj.should_not_receive(:m)
nil&.unknown(obj.m) { obj.m }
end
end
context "when context is false" do
it "calls the method" do
false&.to_s.should == "false"
-> { false&.unknown }.should raise_error(NoMethodError)
end
end
context "when context is truthy" do
it "calls the method" do
1&.to_s.should == "1"
-> { 1&.unknown }.should raise_error(NoMethodError)
end
end
it "takes a list of arguments" do
[1,2,3]&.first(2).should == [1,2]
end
it "takes a block" do
[1,2]&.map { |i| i * 2 }.should == [2, 4]
end
it "allows assignment methods" do
klass = Class.new do
attr_reader :foo
def foo=(val)
@foo = val
42
end
end
obj = klass.new
(obj&.foo = 3).should == 3
obj.foo.should == 3
obj = nil
(obj&.foo = 3).should == nil
end
it "allows assignment operators" do
klass = Class.new do
attr_reader :m
def initialize
@m = 0
end
def m=(v)
@m = v
42
end
end
obj = klass.new
obj&.m += 3
obj.m.should == 3
obj = nil
(obj&.m += 3).should == nil
end
it "allows ||= operator" do
klass = Class.new do
attr_reader :m
def initialize
@m = false
end
def m=(v)
@m = v
42
end
end
obj = klass.new
(obj&.m ||= true).should == true
obj.m.should == true
obj = nil
(obj&.m ||= true).should == nil
obj.should == nil
end
it "allows &&= operator" do
klass = Class.new do
attr_accessor :m
def initialize
@m = true
end
end
obj = klass.new
(obj&.m &&= false).should == false
obj.m.should == false
obj = nil
(obj&.m &&= false).should == nil
obj.should == nil
end
it "does not call the operator method lazily with an assignment operator" do
klass = Class.new do
attr_writer :foo
def foo
nil
end
end
obj = klass.new
-> {
obj&.foo += 3
}.should raise_error(NoMethodError) { |e|
e.name.should == :+
}
end
end
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