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describe :hash_eql, shared: true do
it "does not compare values when keys don't match" do
value = mock('x')
value.should_not_receive(:==)
value.should_not_receive(:eql?)
{ 1 => value }.send(@method, { 2 => value }).should be_false
end
it "returns false when the numbers of keys differ without comparing any elements" do
obj = mock('x')
h = { obj => obj }
obj.should_not_receive(:==)
obj.should_not_receive(:eql?)
{}.send(@method, h).should be_false
h.send(@method, {}).should be_false
end
it "first compares keys via hash" do
x = mock('x')
x.should_receive(:hash).any_number_of_times.and_return(0)
y = mock('y')
y.should_receive(:hash).any_number_of_times.and_return(0)
{ x => 1 }.send(@method, { y => 1 }).should be_false
end
it "does not compare keys with different hash codes via eql?" do
x = mock('x')
y = mock('y')
x.should_not_receive(:eql?)
y.should_not_receive(:eql?)
x.should_receive(:hash).any_number_of_times.and_return(0)
y.should_receive(:hash).any_number_of_times.and_return(1)
{ x => 1 }.send(@method, { y => 1 }).should be_false
end
it "computes equality for recursive hashes" do
h = {}
h[:a] = h
h.send(@method, h[:a]).should be_true
(h == h[:a]).should be_true
end
it "doesn't call to_hash on objects" do
mock_hash = mock("fake hash")
def mock_hash.to_hash() {} end
{}.send(@method, mock_hash).should be_false
end
it "computes equality for complex recursive hashes" do
a, b = {}, {}
a.merge! self: a, other: b
b.merge! self: b, other: a
a.send(@method, b).should be_true # they both have the same structure!
c = {}
c.merge! other: c, self: c
c.send(@method, a).should be_true # subtle, but they both have the same structure!
a[:delta] = c[:delta] = a
c.send(@method, a).should be_false # not quite the same structure, as a[:other][:delta] = nil
c[:delta] = 42
c.send(@method, a).should be_false
a[:delta] = 42
c.send(@method, a).should be_false
b[:delta] = 42
c.send(@method, a).should be_true
end
it "computes equality for recursive hashes & arrays" do
x, y, z = [], [], []
a, b, c = {foo: x, bar: 42}, {foo: y, bar: 42}, {foo: z, bar: 42}
x << a
y << c
z << b
b.send(@method, c).should be_true # they clearly have the same structure!
y.send(@method, z).should be_true
a.send(@method, b).should be_true # subtle, but they both have the same structure!
x.send(@method, y).should be_true
y << x
y.send(@method, z).should be_false
z << x
y.send(@method, z).should be_true
a[:foo], a[:bar] = a[:bar], a[:foo]
a.send(@method, b).should be_false
b[:bar] = b[:foo]
b.send(@method, c).should be_false
end
end
describe :hash_eql_additional, shared: true do
it "compares values when keys match" do
x = mock('x')
y = mock('y')
def x.==(o) false end
def y.==(o) false end
def x.eql?(o) false end
def y.eql?(o) false end
{ 1 => x }.send(@method, { 1 => y }).should be_false
x = mock('x')
y = mock('y')
def x.==(o) true end
def y.==(o) true end
def x.eql?(o) true end
def y.eql?(o) true end
{ 1 => x }.send(@method, { 1 => y }).should be_true
end
it "compares keys with eql? semantics" do
{ 1.0 => "x" }.send(@method, { 1.0 => "x" }).should be_true
{ 1.0 => "x" }.send(@method, { 1.0 => "x" }).should be_true
{ 1 => "x" }.send(@method, { 1.0 => "x" }).should be_false
{ 1.0 => "x" }.send(@method, { 1 => "x" }).should be_false
end
it "returns true if and only if other Hash has the same number of keys and each key-value pair matches" do
a = { a: 5 }
b = {}
a.send(@method, b).should be_false
b[:a] = 5
a.send(@method, b).should be_true
not_supported_on :opal do
c = { "a" => 5 }
a.send(@method, c).should be_false
end
c = { "A" => 5 }
a.send(@method, c).should be_false
c = { a: 6 }
a.send(@method, c).should be_false
end
it "does not call to_hash on hash subclasses" do
{ 5 => 6 }.send(@method, HashSpecs::ToHashHash[5 => 6]).should be_true
end
it "ignores hash class differences" do
h = { 1 => 2, 3 => 4 }
HashSpecs::MyHash[h].send(@method, h).should be_true
HashSpecs::MyHash[h].send(@method, HashSpecs::MyHash[h]).should be_true
h.send(@method, HashSpecs::MyHash[h]).should be_true
end
# Why isn't this true of eql? too ?
it "compares keys with matching hash codes via eql?" do
a = Array.new(2) do
obj = mock('0')
obj.should_receive(:hash).at_least(1).and_return(0)
def obj.eql?(o)
return true if self.equal?(o)
false
end
obj
end
{ a[0] => 1 }.send(@method, { a[1] => 1 }).should be_false
a = Array.new(2) do
obj = mock('0')
obj.should_receive(:hash).at_least(1).and_return(0)
def obj.eql?(o)
true
end
obj
end
{ a[0] => 1 }.send(@method, { a[1] => 1 }).should be_true
end
it "compares the values in self to values in other hash" do
l_val = mock("left")
r_val = mock("right")
l_val.should_receive(:eql?).with(r_val).and_return(true)
{ 1 => l_val }.eql?({ 1 => r_val }).should be_true
end
end
describe :hash_eql_additional_more, shared: true do
it "returns true if other Hash has the same number of keys and each key-value pair matches, even though the default-value are not same" do
Hash.new(5).send(@method, Hash.new(1)).should be_true
Hash.new {|h, k| 1}.send(@method, Hash.new {}).should be_true
Hash.new {|h, k| 1}.send(@method, Hash.new(2)).should be_true
d = Hash.new {|h, k| 1}
e = Hash.new {}
d[1] = 2
e[1] = 2
d.send(@method, e).should be_true
end
end
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