assert('Kernel.eval', '15.3.1.2.3') do
  assert_equal(10) { Kernel.eval '1 * 10' }
  assert_equal('aaa') { Kernel.eval "'a' * 3" }
  assert_equal(10) {
    a = 10
    Kernel.eval "a"
  }
  assert_equal(20) {
    a = 10
    Kernel.eval "a = 20"
    a
  }
  assert_equal(15) {
    c = 5
    lambda {
      a = 10
      Kernel.eval "c = a + c"
    }.call
    c
  }
  assert_equal(5) {
    c = 5
    lambda {
      Kernel.eval 'lambda { c }.call'
    }.call
  }
  assert_equal(15) {
    c = 5
    lambda {
      a = 10
      Kernel.eval 'lambda { c = a + c }.call'
    }.call
    c
  }
  assert_equal(2) {
    a = 10
    Kernel.eval 'def f(a); b=a+1; end'
    f(1)
  }
end

assert('Kernel#eval', '15.3.1.3.12') do
  assert_equal(10) { eval '1 * 10' }
end

assert('rest arguments of eval') do
  assert_raise(TypeError) { Kernel.eval('0', 0, 'test', 0) }
  assert_equal ['test', 'test.rb', 10] do
    Kernel.eval('[\'test\', __FILE__, __LINE__]', nil, 'test.rb', 10)
  end
end

assert 'eval syntax error' do
  assert_raise(SyntaxError) do
    eval 'p "test'
  end
end

assert('String instance_eval') do
  obj = Object.new
  obj.instance_eval{ @test = 'test' }
  assert_raise(ArgumentError) { obj.instance_eval(0) { } }
  assert_raise(ArgumentError) { obj.instance_eval('0', 'test', 0, 'test') }
  assert_equal(['test.rb', 10]) { obj.instance_eval('[__FILE__, __LINE__]', 'test.rb', 10)}
  assert_equal('test') { obj.instance_eval('@test') }
  assert_equal('test') { obj.instance_eval { @test } }
  o = Object.new
  assert_equal ['', o, o], o.instance_eval("[''].each { |s| break [s, o, self] }")
end

assert('Kernel.#eval(string) context') do
  class TestEvalConstScope
    EVAL_CONST_CLASS = 'class'
    def const_string
      eval 'EVAL_CONST_CLASS'
    end
  end
  obj = TestEvalConstScope.new
  assert_raise(NameError) { eval 'EVAL_CONST_CLASS' }
  assert_equal('class') { obj.const_string }
end

assert('BasicObject#instance_eval with begin-rescue-ensure execution order') do
  class HellRaiser
    def raise_hell
      order = [:enter_raise_hell]
      begin
        order.push :begin
        self.instance_eval("raise 'error'")
      rescue
        order.push :rescue
      ensure
        order.push :ensure
      end
      order
    end
  end

  hell_raiser = HellRaiser.new
  assert_equal([:enter_raise_hell, :begin, :rescue, :ensure], hell_raiser.raise_hell)
end

assert('BasicObject#instance_eval to define singleton methods Issue #3141') do
  foo_class = Class.new do
    def bar(x)
      instance_eval "def baz; #{x}; end"
    end
  end

  f1 = foo_class.new
  f2 = foo_class.new
  f1.bar 1
  f2.bar 2
  assert_equal(1){f1.baz}
  assert_equal(2){f2.baz}
end

assert('Kernel.#eval(string) Issue #4021') do
  assert_equal('FOO') { (eval <<'EOS').call }
foo = "FOO"
Proc.new { foo }
EOS
  assert_equal('FOO') {
    def do_eval(code)
      eval(code)
    end
    do_eval(<<'EOS').call
foo = "FOO"
Proc.new { foo }
EOS
  }
end

assert('Calling the same method as the variable name') do
  hoge = Object.new
  def hoge.fuga
    "Hit!"
  end
  assert_equal("Hit!") { fuga = "Miss!"; eval "hoge.fuga" }
  assert_equal("Hit!") { fuga = "Miss!"; -> { eval "hoge.fuga" }.call }
  assert_equal("Hit!") { -> { fuga = "Miss!"; eval "hoge.fuga" }.call }
  assert_equal("Hit!") { fuga = "Miss!"; eval("-> { hoge.fuga }").call }
end

assert('Access numbered parameter from eval') do
  hoge = Object.new
  def hoge.fuga(a, &b)
    b.call(a)
  end
  assert_equal(6) {
    hoge.fuga(3) { _1 + eval("_1") }
  }
end

assert('Module#class_eval with string') do
  c = Class.new
  c.class_eval "def foo() 42; end"
  cc = c.new
  assert_true cc.respond_to?(:foo)
  assert_equal 42, c.new.foo

  b = c.class_eval("class A; def a; 55; end; end; class B; def b; A; end; end; B")
  assert_equal 55, b.new.b.new.a
end
