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