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describe "Kernel#try" do it "should return the value of the 1st lambda/proc/method call if the 1st proc succeeds" do try( Proc.new { 'foo' }, Proc.new { 'bar' } ).should == 'foo' end it "should return the value of the 2nd lambda/proc/method call if the 1st fails but the 2nd succeeds" do try( Proc.new { raise StandardError }, Proc.new { 1 + 1 } ).should == 2 end it "should accept an arbitrary number of arguments and return the value of the last proc if only the last proc succeeds" do try( Proc.new { raise StandardError }, Kernel.method('raise'), lambda { raise RuntimeError }, proc { 'last' } ).should == 'last' end it "should allow a fallback value to be passed as the final value" do value = try( Proc.new { raise StandardError }, Proc.new { raise StandardError }, :fallback ) value.should == :fallback end it "should accept Methods" do to_s_of_1_method = 1.method('to_s') to_s_of_foo_method = 'foo'.method('to_s') try( to_s_of_1_method, to_s_of_foo_method ).should == '1' end it "should accept procs" do test_proc = proc { 1 + 1 } try( test_proc, proc { 'will not come here' } ).should == 2 end it "should accept lambdas" do try( lambda { 1 + 1 }, lambda { 2 + 2 } ).should == 2 end it "should raise a RuntimeError if none of the procs succeed" do lambda { try( Proc.new { raise StandardError }, Proc.new { raise StandardError } ) }.should raise_error(RuntimeError, 'None of the given procs succeeded') end it "should raise an ArgumentError if passed less than 2 arguments" do lambda { try() }.should raise_error(ArgumentError, 'try requires at least 2 arguments') lambda { try(Proc.new {}) }.should raise_error(ArgumentError, 'try requires at least 2 arguments') end end