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author | eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-05-07 12:04:49 +0000 |
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committer | eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-05-07 12:04:49 +0000 |
commit | a3736e97a6ca517c2cd7d3d93a8f2ef86e39e5b5 (patch) | |
tree | 9eef7f720314ebaff56845a74e203770e62284e4 /spec/rubyspec/language/safe_navigator_spec.rb | |
parent | 52df1d0d3370919711c0577aaa42d1a864709885 (diff) | |
download | ruby-a3736e97a6ca517c2cd7d3d93a8f2ef86e39e5b5.tar.gz |
Add in-tree mspec and ruby/spec
* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
These files can therefore be updated like any other file in MRI.
Instructions are provided in spec/README.
[Feature #13156] [ruby-core:79246]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'spec/rubyspec/language/safe_navigator_spec.rb')
-rw-r--r-- | spec/rubyspec/language/safe_navigator_spec.rb | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/spec/rubyspec/language/safe_navigator_spec.rb b/spec/rubyspec/language/safe_navigator_spec.rb new file mode 100644 index 0000000000..a8b29dc5a3 --- /dev/null +++ b/spec/rubyspec/language/safe_navigator_spec.rb @@ -0,0 +1,101 @@ +require File.expand_path("../../spec_helper", __FILE__) + +ruby_version_is "2.3" do + describe "Safe navigator" do + it "requires a method name to be provided" do + lambda { eval("obj&. {}") }.should raise_error(SyntaxError) + end + + context "when context is nil" do + it "always returns nil" do + eval("nil&.unknown").should == nil + eval("[][10]&.unknown").should == nil + end + + it "can be chained" do + eval("nil&.one&.two&.three").should == nil + end + + it "doesn't evaluate arguments" do + obj = Object.new + obj.should_not_receive(:m) + eval("nil&.unknown(obj.m) { obj.m }") + end + end + + context "when context is false" do + it "calls the method" do + eval("false&.to_s").should == "false" + + lambda { eval("false&.unknown") }.should raise_error(NoMethodError) + end + end + + context "when context is truthy" do + it "calls the method" do + eval("1&.to_s").should == "1" + + lambda { eval("1&.unknown") }.should raise_error(NoMethodError) + end + end + + it "takes a list of arguments" do + eval("[1,2,3]&.first(2)").should == [1,2] + end + + it "takes a block" do + eval("[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 + + eval("obj&.foo = 3").should == 3 + obj.foo.should == 3 + + obj = nil + eval("obj&.foo = 3").should == nil + end + + it "allows assignment operators" do + klass = Class.new do + attr_accessor :m + + def initialize + @m = 0 + end + end + + obj = klass.new + + eval("obj&.m += 3") + obj.m.should == 3 + + obj = nil + eval("obj&.m += 3").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 + + lambda { + eval("obj&.foo += 3") + }.should raise_error(NoMethodError) { |e| + e.name.should == :+ + } + end + end +end |