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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
it "does not evaluate the block if the envirionment 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
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