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require 'test/unit'
class TestLambdaParameters < Test::Unit::TestCase
def test_exact_parameter
assert_raise(ArgumentError){(1..3).each(&lambda{})}
end
def test_call_simple
assert_equal(1, lambda{|a| a}.call(1))
assert_equal([1,2], lambda{|a, b| [a,b]}.call(1,2))
assert_raise(ArgumentError) { lambda{|a|}.call(1,2) }
assert_raise(ArgumentError) { lambda{|a|}.call() }
assert_raise(ArgumentError) { lambda{}.call(1) }
assert_raise(ArgumentError) { lambda{|a, b|}.call(1,2,3) }
assert_equal(1, ->(a){ a }.call(1))
assert_equal([1,2], ->(a,b){ [a,b] }.call(1,2))
assert_raise(ArgumentError) { ->(a){ }.call(1,2) }
assert_raise(ArgumentError) { ->(a){ }.call() }
assert_raise(ArgumentError) { ->(){ }.call(1) }
assert_raise(ArgumentError) { ->(a,b){ }.call(1,2,3) }
end
def test_lambda_as_iterator
a = 0
2.times(&->(_){ a += 1 })
assert_equal(2, a)
assert_raise(ArgumentError) {1.times(&->(){ a += 1 })}
bug9605 = '[ruby-core:61468] [Bug #9605]'
assert_nothing_raised(ArgumentError, bug9605) {1.times(&->(n){ a += 1 })}
assert_equal(3, a, bug9605)
assert_nothing_raised(ArgumentError, bug9605) {a = [[1, 2]].map(&->(x, y) {x+y})}
assert_equal([3], a, bug9605)
end
def test_call_rest_args
assert_equal([1,2], ->(*a){ a }.call(1,2))
assert_equal([1,2,[]], ->(a,b,*c){ [a,b,c] }.call(1,2))
assert_raise(ArgumentError){ ->(a,*b){ }.call() }
end
def test_call_opt_args
assert_equal([1,2,3,4], ->(a,b,c=3,d=4){ [a,b,c,d] }.call(1,2))
assert_equal([1,2,3,4], ->(a,b,c=0,d=4){ [a,b,c,d] }.call(1,2,3))
assert_raise(ArgumentError){ ->(a,b=1){ }.call() }
assert_raise(ArgumentError){ ->(a,b=1){ }.call(1,2,3) }
end
def test_call_rest_and_opt
assert_equal([1,2,3,[]], ->(a,b=2,c=3,*d){ [a,b,c,d] }.call(1))
assert_equal([1,2,3,[]], ->(a,b=0,c=3,*d){ [a,b,c,d] }.call(1,2))
assert_equal([1,2,3,[4,5,6]], ->(a,b=0,c=0,*d){ [a,b,c,d] }.call(1,2,3,4,5,6))
assert_raise(ArgumentError){ ->(a,b=1,*c){ }.call() }
end
def test_call_with_block
f = ->(a,b,c=3,*d,&e){ [a,b,c,d,e.call(d + [a,b,c])] }
assert_equal([1,2,3,[],6], f.call(1,2){|z| z.inject{|s,x| s+x} } )
assert_equal(nil, ->(&b){ b }.call)
foo { puts "bogus block " }
assert_equal(1, ->(&b){ b.call }.call { 1 })
b = nil
assert_equal(1, ->(&b){ b.call }.call { 1 })
assert_nil(b)
end
def test_call_block_from_lambda
bug9605 = '[ruby-core:61470] [Bug #9605]'
plus = ->(x,y) {x+y}
assert_raise(ArgumentError, bug9605) {proc(&plus).call [1,2]}
end
def yield_1(arg)
yield arg
end
tap do |;bug9605, expected, result|
bug9605 = '[ruby-core:65887] [Bug #9605] arity check should be relaxed'
expected = [1,2,3]
[
["array", expected],
["to_ary", Struct.new(:to_ary).new(expected)],
].product \
[
["proc", proc {|a, b, c| [a, b, c]}],
["lambda", lambda {|a, b, c| [a, b, c]}],
] do
|(vtype, val), (btype, block)|
define_method("test_yeild_relaxed(#{vtype},&#{btype})") do
result = assert_nothing_raised(ArgumentError, bug9605) {
break yield_1(val, &block)
}
assert_equal(expected, result, bug9605)
end
end
end
def foo
assert_equal(nil, ->(&b){ b }.call)
end
def test_in_basic_object
bug5966 = '[ruby-core:42349]'
called = false
BasicObject.new.instance_eval {->() {called = true}.()}
assert_equal(true, called, bug5966)
end
def test_location_on_error
bug6151 = '[ruby-core:43314]'
called = 0
line, f = __LINE__, lambda do
called += 1
true
end
e = assert_raise(ArgumentError) do
f.call(42)
end
assert_send([e.backtrace.first, :start_with?, "#{__FILE__}:#{line}:"], bug6151)
assert_equal(0, called)
e = assert_raise(ArgumentError) do
42.times(&f)
end
assert_send([e.backtrace.first, :start_with?, "#{__FILE__}:#{line}:"], bug6151)
assert_equal(0, called)
end
def return_in_current(val)
1.tap(&->(*) {return 0})
val
end
def yield_block
yield
end
def return_in_callee(val)
yield_block(&->(*) {return 0})
val
end
def test_return
feature8693 = '[ruby-core:56193] [Feature #8693]'
assert_equal(42, return_in_current(42), feature8693)
assert_equal(42, return_in_callee(42), feature8693)
end
def test_do_lambda_source_location
exp_lineno = __LINE__ + 3
lmd = ->(x,
y,
z) do
#
end
file, lineno = lmd.source_location
assert_match(/^#{ Regexp.quote(__FILE__) }$/, file)
assert_equal(exp_lineno, lineno, "must be at the beginning of the block")
end
def test_brace_lambda_source_location
exp_lineno = __LINE__ + 3
lmd = ->(x,
y,
z) {
#
}
file, lineno = lmd.source_location
assert_match(/^#{ Regexp.quote(__FILE__) }$/, file)
assert_equal(exp_lineno, lineno, "must be at the beginning of the block")
end
end
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