diff options
Diffstat (limited to 'spec/rubyspec/core/kernel/instance_variable_defined_spec.rb')
-rw-r--r-- | spec/rubyspec/core/kernel/instance_variable_defined_spec.rb | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/spec/rubyspec/core/kernel/instance_variable_defined_spec.rb b/spec/rubyspec/core/kernel/instance_variable_defined_spec.rb new file mode 100644 index 0000000000..969d36c731 --- /dev/null +++ b/spec/rubyspec/core/kernel/instance_variable_defined_spec.rb @@ -0,0 +1,41 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Kernel#instance_variable_defined?" do + before do + @instance = KernelSpecs::InstanceVariable.new + end + + describe "when passed a String" do + it "returns false if the instance variable is not defined" do + @instance.instance_variable_defined?("@goodbye").should be_false + end + + it "returns true if the instance variable is defined" do + @instance.instance_variable_defined?("@greeting").should be_true + end + end + + describe "when passed a Symbol" do + it "returns false if the instance variable is not defined" do + @instance.instance_variable_defined?(:@goodbye).should be_false + end + + it "returns true if the instance variable is defined" do + @instance.instance_variable_defined?(:@greeting).should be_true + end + end + + it "raises a TypeError if passed an Object not defining #to_str" do + lambda do + obj = mock("kernel instance_variable_defined?") + @instance.instance_variable_defined? obj + end.should raise_error(TypeError) + end + + it "returns false if the instance variable is not defined for different types" do + [nil, false, true, 1, 2.0, :test, "test"].each do |obj| + obj.instance_variable_defined?("@goodbye").should be_false + end + end +end |