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require_relative '../../spec_helper'
describe "Struct#deconstruct_keys" do
it "returns a hash of attributes" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
end
it "requires one argument" do
struct = Struct.new(:x)
obj = struct.new(1)
-> {
obj.deconstruct_keys
}.should raise_error(ArgumentError, /wrong number of arguments \(given 0, expected 1\)/)
end
it "returns only specified keys" do
struct = Struct.new(:x, :y, :z)
s = struct.new(1, 2, 3)
s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
s.deconstruct_keys([:x] ).should == {x: 1}
s.deconstruct_keys([] ).should == {}
end
it "accepts string attribute names" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys(['x', 'y']).should == {'x' => 1, 'y' => 2}
end
it "accepts argument position number as well but returns them as keys" do
struct = Struct.new(:x, :y, :z)
s = struct.new(10, 20, 30)
s.deconstruct_keys([0, 1, 2]).should == {0 => 10, 1 => 20, 2 => 30}
s.deconstruct_keys([0, 1] ).should == {0 => 10, 1 => 20}
s.deconstruct_keys([0] ).should == {0 => 10}
s.deconstruct_keys([-1] ).should == {-1 => 30}
end
it "ignores incorrect position numbers" do
struct = Struct.new(:x, :y, :z)
s = struct.new(10, 20, 30)
s.deconstruct_keys([0, 3]).should == {0 => 10}
end
it "support mixing attribute names and argument position numbers" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys([0, :x]).should == {0 => 1, :x => 1}
end
it "returns an empty hash when there are more keys than attributes" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys([:x, :y, :a]).should == {}
end
it "returns at first not existing attribute name" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys([:a, :x]).should == {}
s.deconstruct_keys([:x, :a]).should == {x: 1}
end
it "returns at first not existing argument position number" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
s.deconstruct_keys([3, 0]).should == {}
s.deconstruct_keys([0, 3]).should == {0 => 1}
end
it "accepts nil argument and return all the attributes" do
struct = Struct.new(:x, :y)
obj = struct.new(1, 2)
obj.deconstruct_keys(nil).should == {x: 1, y: 2}
end
it "tries to convert a key with #to_int if index is not a String nor a Symbol, but responds to #to_int" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
key = mock("to_int")
key.should_receive(:to_int).and_return(1)
s.deconstruct_keys([key]).should == { key => 2 }
end
it "raises a TypeError if the conversion with #to_int does not return an Integer" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
key = mock("to_int")
key.should_receive(:to_int).and_return("not an Integer")
-> {
s.deconstruct_keys([key])
}.should raise_error(TypeError, /can't convert MockObject to Integer/)
end
it "raises TypeError if index is not a String, a Symbol and not convertible to Integer" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
-> {
s.deconstruct_keys([0, []])
}.should raise_error(TypeError, "no implicit conversion of Array into Integer")
end
it "raise TypeError if passed anything except nil or array" do
struct = Struct.new(:x, :y)
s = struct.new(1, 2)
-> { s.deconstruct_keys('x') }.should raise_error(TypeError, /expected Array or nil/)
-> { s.deconstruct_keys(1) }.should raise_error(TypeError, /expected Array or nil/)
-> { s.deconstruct_keys(:x) }.should raise_error(TypeError, /expected Array or nil/)
-> { s.deconstruct_keys({}) }.should raise_error(TypeError, /expected Array or nil/)
end
end
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