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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Hash.[]" do
describe "passed zero arguments" do
it "returns an empty hash" do
Hash[].should == {}
end
end
it "creates a Hash; values can be provided as the argument list" do
Hash[:a, 1, :b, 2].should == { a: 1, b: 2 }
Hash[].should == {}
Hash[:a, 1, :b, { c: 2 }].should == { a: 1, b: { c: 2 } }
end
it "creates a Hash; values can be provided as one single hash" do
Hash[a: 1, b: 2].should == { a: 1, b: 2 }
Hash[{1 => 2, 3 => 4}].should == {1 => 2, 3 => 4}
Hash[{}].should == {}
end
describe "passed an array" do
it "treats elements that are 2 element arrays as key and value" do
Hash[[[:a, :b], [:c, :d]]].should == { a: :b, c: :d }
end
it "treats elements that are 1 element arrays as keys with value nil" do
Hash[[[:a]]].should == { a: nil }
end
end
# #1000 #1385
it "creates a Hash; values can be provided as a list of value-pairs in an array" do
Hash[[[:a, 1], [:b, 2]]].should == { a: 1, b: 2 }
end
it "coerces a single argument which responds to #to_ary" do
ary = mock('to_ary')
ary.should_receive(:to_ary).and_return([[:a, :b]])
Hash[ary].should == { a: :b }
end
it "raises for elements that are not arrays" do
-> {
Hash[[:a]].should == {}
}.should raise_error(ArgumentError)
-> {
Hash[[:nil]].should == {}
}.should raise_error(ArgumentError)
end
it "raises an ArgumentError for arrays of more than 2 elements" do
->{ Hash[[[:a, :b, :c]]].should == {} }.should raise_error(ArgumentError)
end
it "raises an ArgumentError when passed a list of value-invalid-pairs in an array" do
-> {
-> {
Hash[[[:a, 1], [:b], 42, [:d, 2], [:e, 2, 3], []]]
}.should complain(/ignoring wrong elements/)
}.should raise_error(ArgumentError)
end
describe "passed a single argument which responds to #to_hash" do
it "coerces it and returns a copy" do
h = { a: :b, c: :d }
to_hash = mock('to_hash')
to_hash.should_receive(:to_hash).and_return(h)
result = Hash[to_hash]
result.should == h
result.should_not equal(h)
end
end
it "raises an ArgumentError when passed an odd number of arguments" do
-> { Hash[1, 2, 3] }.should raise_error(ArgumentError)
-> { Hash[1, 2, { 3 => 4 }] }.should raise_error(ArgumentError)
end
it "calls to_hash" do
obj = mock('x')
def obj.to_hash() { 1 => 2, 3 => 4 } end
Hash[obj].should == { 1 => 2, 3 => 4 }
end
it "returns an instance of a subclass when passed an Array" do
HashSpecs::MyHash[1,2,3,4].should be_an_instance_of(HashSpecs::MyHash)
end
it "returns instances of subclasses" do
HashSpecs::MyHash[].should be_an_instance_of(HashSpecs::MyHash)
end
it "returns an instance of the class it's called on" do
Hash[HashSpecs::MyHash[1, 2]].class.should == Hash
HashSpecs::MyHash[Hash[1, 2]].should be_an_instance_of(HashSpecs::MyHash)
end
it "does not call #initialize on the subclass instance" do
HashSpecs::MyInitializerHash[Hash[1, 2]].should be_an_instance_of(HashSpecs::MyInitializerHash)
end
it "removes the default_proc" do
hash = Hash.new { |h, k| h[k] = [] }
Hash[hash].default_proc.should be_nil
end
end
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