require_relative '../../spec_helper' describe "ENV.delete" do before :each do @saved_foo = ENV["foo"] end after :each do ENV["foo"] = @saved_foo end it "removes the variable from the environment" do ENV["foo"] = "bar" ENV.delete("foo") ENV["foo"].should == nil end it "returns the previous value" do ENV["foo"] = "bar" ENV.delete("foo").should == "bar" end it "returns nil if the named environment variable does not exist and no block given" do ENV.delete("foo") ENV.delete("foo").should == nil end it "yields the name to the given block if the named environment variable does not exist" do ENV.delete("foo") ENV.delete("foo") { |name| ScratchPad.record name } ScratchPad.recorded.should == "foo" end ruby_version_is "3.0" do it "returns the result of given block if the named environment variable does not exist" do ENV.delete("foo") ENV.delete("foo") { |name| "bar" }.should == "bar" end end it "does not evaluate the block if the environment variable exists" do ENV["foo"] = "bar" ENV.delete("foo") { |name| fail "Should not happen" } ENV["foo"].should == nil end it "raises TypeError if the argument is not a String and does not respond to #to_str" do -> { ENV.delete(Object.new) }.should raise_error(TypeError, "no implicit conversion of Object into String") end end