diff options
Diffstat (limited to 'spec/ruby/core/kernel/instance_variable_get_spec.rb')
-rw-r--r-- | spec/ruby/core/kernel/instance_variable_get_spec.rb | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/instance_variable_get_spec.rb b/spec/ruby/core/kernel/instance_variable_get_spec.rb new file mode 100644 index 0000000000..0c564f11b6 --- /dev/null +++ b/spec/ruby/core/kernel/instance_variable_get_spec.rb @@ -0,0 +1,105 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Kernel#instance_variable_get" do + before :each do + @obj = Object.new + @obj.instance_variable_set("@test", :test) + end + + it "tries to convert the passed argument to a String using #to_str" do + obj = mock("to_str") + obj.should_receive(:to_str).and_return("@test") + @obj.instance_variable_get(obj) + end + + it "returns the value of the passed instance variable that is referred to by the conversion result" do + obj = mock("to_str") + obj.stub!(:to_str).and_return("@test") + @obj.instance_variable_get(obj).should == :test + end + + it "returns nil when the referred instance variable does not exist" do + @obj.instance_variable_get(:@does_not_exist).should be_nil + end + + it "raises a TypeError when the passed argument does not respond to #to_str" do + lambda { @obj.instance_variable_get(Object.new) }.should raise_error(TypeError) + end + + it "raises a TypeError when the passed argument can't be converted to a String" do + obj = mock("to_str") + obj.stub!(:to_str).and_return(123) + lambda { @obj.instance_variable_get(obj) }.should raise_error(TypeError) + end + + it "raises a NameError when the conversion result does not start with an '@'" do + obj = mock("to_str") + obj.stub!(:to_str).and_return("test") + lambda { @obj.instance_variable_get(obj) }.should raise_error(NameError) + end + + it "raises a NameError when passed just '@'" do + obj = mock("to_str") + obj.stub!(:to_str).and_return('@') + lambda { @obj.instance_variable_get(obj) }.should raise_error(NameError) + end +end + +describe "Kernel#instance_variable_get when passed Symbol" do + before :each do + @obj = Object.new + @obj.instance_variable_set("@test", :test) + end + + it "returns the value of the instance variable that is referred to by the passed Symbol" do + @obj.instance_variable_get(:@test).should == :test + end + + it "raises a NameError when passed :@ as an instance variable name" do + lambda { @obj.instance_variable_get(:"@") }.should raise_error(NameError) + end + + it "raises a NameError when the passed Symbol does not start with an '@'" do + lambda { @obj.instance_variable_get(:test) }.should raise_error(NameError) + end + + it "raises a NameError when the passed Symbol is an invalid instance variable name" do + lambda { @obj.instance_variable_get(:"@0") }.should raise_error(NameError) + end +end + +describe "Kernel#instance_variable_get when passed String" do + before :each do + @obj = Object.new + @obj.instance_variable_set("@test", :test) + end + + it "returns the value of the instance variable that is referred to by the passed String" do + @obj.instance_variable_get("@test").should == :test + end + + it "raises a NameError when the passed String does not start with an '@'" do + lambda { @obj.instance_variable_get("test") }.should raise_error(NameError) + end + + it "raises a NameError when the passed String is an invalid instance variable name" do + lambda { @obj.instance_variable_get("@0") }.should raise_error(NameError) + end + + it "raises a NameError when passed '@' as an instance variable name" do + lambda { @obj.instance_variable_get("@") }.should raise_error(NameError) + end +end + +describe "Kernel#instance_variable_get when passed Fixnum" do + before :each do + @obj = Object.new + @obj.instance_variable_set("@test", :test) + end + + it "raises a TypeError" do + lambda { @obj.instance_variable_get(10) }.should raise_error(TypeError) + lambda { @obj.instance_variable_get(-10) }.should raise_error(TypeError) + end +end |