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RSpec.describe "Contracts:" do
before :all do
@o = GenericExample.new
end
def fails(&some)
expect { some.call }.to raise_error(ContractError)
end
def passes(&some)
expect { some.call }.to_not raise_error
end
describe "DescendantOf:" do
it "should pass for Array" do
passes { @o.enumerable_descendant_test(Array) }
end
it "should pass for a hash" do
passes { @o.enumerable_descendant_test(Hash) }
end
it "should fail for a number class" do
fails { @o.enumerable_descendant_test(Integer) }
end
it "should fail for a non-class" do
fails { @o.enumerable_descendant_test(1) }
end
end
describe "Num:" do
it "should pass for Integers" do
passes { @o.double(2) }
end
it "should pass for Floats" do
passes { @o.double(2.2) }
end
it "should fail for nil and other data types" do
fails { @o.double(nil) }
fails { @o.double(:x) }
fails { @o.double("x") }
fails { @o.double(/x/) }
end
end
describe "Pos:" do
it "should pass for positive numbers" do
passes { @o.pos_test(1) }
passes { @o.pos_test(1.6) }
end
it "should fail for 0" do
fails { @o.pos_test(0) }
end
it "should fail for negative numbers" do
fails { @o.pos_test(-1) }
fails { @o.pos_test(-1.6) }
end
it "should fail for nil and other data types" do
fails { @o.pos_test(nil) }
fails { @o.pos_test(:x) }
fails { @o.pos_test("x") }
fails { @o.pos_test(/x/) }
end
end
describe "Neg:" do
it "should pass for negative numbers" do
passes { @o.neg_test(-1) }
passes { @o.neg_test(-1.6) }
end
it "should fail for 0" do
fails { @o.neg_test(0) }
end
it "should fail for positive numbers" do
fails { @o.neg_test(1) }
fails { @o.neg_test(1.6) }
end
it "should fail for nil and other data types" do
fails { @o.neg_test(nil) }
fails { @o.neg_test(:x) }
fails { @o.neg_test("x") }
fails { @o.neg_test(/x/) }
end
end
describe "Nat:" do
it "should pass for 0" do
passes { @o.nat_test(0) }
end
it "should pass for positive whole numbers" do
passes { @o.nat_test(1) }
end
it "should fail for positive non-whole numbers" do
fails { @o.nat_test(1.5) }
end
it "should fail for negative numbers" do
fails { @o.nat_test(-1) }
fails { @o.nat_test(-1.6) }
end
it "should fail for nil and other data types" do
fails { @o.nat_test(nil) }
fails { @o.nat_test(:x) }
fails { @o.nat_test("x") }
fails { @o.nat_test(/x/) }
end
end
describe "Any:" do
it "should pass for numbers" do
passes { @o.show(1) }
end
it "should pass for strings" do
passes { @o.show("bad") }
end
it "should pass for procs" do
passes { @o.show(lambda {}) }
end
it "should pass for nil" do
passes { @o.show(nil) }
end
end
describe "None:" do
it "should fail for numbers" do
fails { @o.fail_all(1) }
end
it "should fail for strings" do
fails { @o.fail_all("bad") }
end
it "should fail for procs" do
fails { @o.fail_all(lambda {}) }
end
it "should fail for nil" do
fails { @o.fail_all(nil) }
end
end
describe "Or:" do
it "should pass for nums" do
passes { @o.num_or_string(1) }
end
it "should pass for strings" do
passes { @o.num_or_string("bad") }
end
it "should fail for nil" do
fails { @o.num_or_string(nil) }
end
end
describe "Xor:" do
it "should pass for an object with a method :good" do
passes { @o.xor_test(A.new) }
end
it "should pass for an object with a method :bad" do
passes { @o.xor_test(B.new) }
end
it "should fail for an object with neither method" do
fails { @o.xor_test(1) }
end
it "should fail for an object with both methods :good and :bad" do
fails { @o.xor_test(F.new) }
end
end
describe "And:" do
it "should pass for an object of class A that has a method :good" do
passes { @o.and_test(A.new) }
end
it "should fail for an object that has a method :good but isn't of class A" do
fails { @o.and_test(F.new) }
end
end
describe "Enum:" do
it "should pass for an object that is included" do
passes { @o.enum_test(:a) }
end
it "should fail for an object that is not included" do
fails { @o.enum_test(:z) }
end
end
describe "RespondTo:" do
it "should pass for an object that responds to :good" do
passes { @o.responds_test(A.new) }
end
it "should fail for an object that doesn't respond to :good" do
fails { @o.responds_test(B.new) }
end
end
describe "Send:" do
it "should pass for an object that returns true for method :good" do
passes { @o.send_test(A.new) }
end
it "should fail for an object that returns false for method :good" do
fails { @o.send_test(F.new) }
end
end
describe "Exactly:" do
it "should pass for an object that is exactly a Parent" do
passes { @o.exactly_test(Parent.new) }
end
it "should fail for an object that inherits from Parent" do
fails { @o.exactly_test(Child.new) }
end
it "should fail for an object that is not related to Parent at all" do
fails { @o.exactly_test(A.new) }
end
end
describe "Eq:" do
it "should pass for a class" do
passes { @o.eq_class_test(Foo) }
end
it "should pass for a module" do
passes { @o.eq_module_test(Bar) }
end
it "should pass for other values" do
passes { @o.eq_value_test(Baz) }
end
it "should fail when not equal" do
fails { @o.eq_class_test(Bar) }
end
it "should fail when given instance of class" do
fails { @o.eq_class_test(Foo.new) }
end
end
describe "Not:" do
it "should pass for an argument that isn't nil" do
passes { @o.not_nil(1) }
end
it "should fail for nil" do
fails { @o.not_nil(nil) }
end
end
describe "ArrayOf:" do
it "should pass for an array of nums" do
passes { @o.product([1, 2, 3]) }
end
it "should fail for an array with one non-num" do
fails { @o.product([1, 2, 3, "bad"]) }
end
it "should fail for a non-array" do
fails { @o.product(1) }
end
end
describe "RangeOf:" do
require "date"
it "should pass for a range of nums" do
passes { @o.first_in_range_num(3..10) }
end
it "should pass for a range of dates" do
d1 = Date.today
d2 = d1 + 18
passes { @o.first_in_range_date(d1..d2) }
end
it "should fail for a non-range" do
fails { @o.first_in_range_num("foo") }
fails { @o.first_in_range_num(:foo) }
fails { @o.first_in_range_num(5) }
fails { @o.first_in_range_num(nil) }
end
it "should fail for a range with incorrect data type" do
fails { @o.first_in_range_num("a".."z") }
end
it "should fail for a badly-defined range" do
# For some reason, Ruby 2.0.0 allows (date .. number) as a range.
# Perhaps other Ruby versions do too.
# Note that (date .. string) gives ArgumentError.
# This test guards against ranges with inconsistent data types.
begin
d1 = Date.today
fails { @o.first_in_range_date(d1..10) }
fails { @o.first_in_range_num(d1..10) }
rescue ArgumentError
# If Ruby doesn't like the range, we ignore the test.
:nop
end
end
end
describe "SetOf:" do
it "should pass for a set of nums" do
passes { @o.product_from_set(Set.new([1, 2, 3])) }
end
it "should fail for an array with one non-num" do
fails { @o.product_from_set(Set.new([1, 2, 3, "bad"])) }
end
it "should fail for a non-array" do
fails { @o.product_from_set(1) }
end
end
describe "Bool:" do
it "should pass for an argument that is a boolean" do
passes { @o.bool_test(true) }
passes { @o.bool_test(false) }
end
it "should fail for nil" do
fails { @o.bool_test(nil) }
end
end
describe "Maybe:" do
it "should pass for nums" do
expect(@o.maybe_double(1)).to eq(2)
end
it "should pass for nils" do
expect(@o.maybe_double(nil)).to eq(nil)
end
it "should fail for strings" do
fails { @o.maybe_double("foo") }
end
end
describe "KeywordArgs:" do
it "should pass for exact correct input" do
passes { @o.person_keywordargs(:name => "calvin", :age => 10) }
end
it "should fail if some keys don't have contracts" do
fails { @o.person_keywordargs(:name => "calvin", :age => 10, :foo => "bar") }
end
it "should fail if a key with a contract on it isn't provided" do
fails { @o.person_keywordargs(:name => "calvin") }
end
it "should fail for incorrect input" do
fails { @o.person_keywordargs(:name => 50, :age => 10) }
fails { @o.hash_keywordargs(:hash => nil) }
fails { @o.hash_keywordargs(:hash => 1) }
end
end
describe "Optional:" do
it "can't be used outside of KeywordArgs" do
expect do
BareOptionalContractUsed.new.something(3, 5)
end.to raise_error(ArgumentError, Contracts::Optional::UNABLE_TO_USE_OUTSIDE_OF_OPT_HASH)
end
end
describe "HashOf:" do
it "doesn't allow to specify multiple key-value pairs with pretty syntax" do
expect do
Class.new do
include Contracts::Core
Contract Contracts::HashOf[Symbol => String, Contracts::Num => Contracts::Num] => nil
def something(hash)
# ...
end
end
end.to raise_error(ArgumentError, "You should provide only one key-value pair to HashOf contract")
end
context "given a fulfilled contract" do
it { expect(@o.gives_max_value({ :panda => 1, :bamboo => 2 })).to eq(2) }
it { expect(@o.pretty_gives_max_value({ :panda => 1, :bamboo => 2 })).to eq(2) }
end
context "given an unfulfilled contract" do
it { fails { @o.gives_max_value({ :panda => "1", :bamboo => "2" }) } }
it { fails { @o.gives_max_value(nil) } }
it { fails { @o.gives_max_value(1) } }
it { fails { @o.pretty_gives_max_value({ :panda => "1", :bamboo => "2" }) } }
end
describe "#to_s" do
context "given Symbol => String" do
it { expect(Contracts::HashOf[Symbol, String].to_s).to eq("Hash<Symbol, String>") }
end
context "given String => Num" do
it { expect(Contracts::HashOf[String, Contracts::Num].to_s).to eq("Hash<String, Contracts::Builtin::Num>") }
end
end
end
describe "StrictHash:" do
context "when given an exact correct input" do
it "does not raise an error" do
passes { @o.strict_person({ :name => "calvin", :age => 10 }) }
end
end
context "when given an input with correct keys but wrong types" do
it "raises an error" do
fails { @o.strict_person({ :name => "calvin", :age => "10" }) }
end
end
context "when given an input with missing keys" do
it "raises an error" do
fails { @o.strict_person({ :name => "calvin" }) }
end
end
context "when given an input with extra keys" do
it "raises an error" do
fails { @o.strict_person({ :name => "calvin", :age => 10, :soft => true }) }
end
end
context "when given not a hash" do
it "raises an error" do
fails { @o.strict_person(1337) }
end
end
end
end
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