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# frozen_string_literal: true
require "test_helper"
module WebConsole
class EvaluatorTest < ActiveSupport::TestCase
class TestError < StandardError
def backtrace
[
"/web-console/lib/web_console/repl.rb:16:in `eval'",
"/web-console/lib/web_console/repl.rb:16:in `eval'"
]
end
end
class BadlyDefinedError < StandardError
def backtrace
nil
end
end
setup do
@repl1 = @repl = Evaluator.new
@repl2 = Evaluator.new
end
test "sending input returns the result as output" do
assert_equal "=> 42\n", @repl.eval("foo = 42")
end
test "preserves the session in the binding" do
assert_equal "=> 42\n", @repl.eval("foo = 42")
assert_equal "=> 50\n", @repl.eval("foo + 8")
end
test "session preservation requires same bindings" do
assert_equal "=> 42\n", @repl1.eval("foo = 42")
assert_equal "=> 42\n", @repl2.eval("foo")
end
test "formats exceptions similarly to IRB" do
repl = Evaluator.new(binding)
assert_equal <<-END.strip_heredoc, repl.eval("raise TestError, 'panic'")
#{TestError.name}: panic
\tfrom /web-console/lib/web_console/repl.rb:16:in `eval'
\tfrom /web-console/lib/web_console/repl.rb:16:in `eval'
END
end
test "no backtrace is shown if exception backtrace is blank" do
repl = Evaluator.new(binding)
assert_equal <<-END.strip_heredoc, repl.eval("raise BadlyDefinedError")
#{BadlyDefinedError.name}: #{BadlyDefinedError.name}
END
end
test "Evaluator callers are cleaned up of unneeded backtraces", only: :ruby do
# Those have to be on the same line to get the same trace.
repl, trace = Evaluator.new(binding), current_trace
assert_equal <<-END.strip_heredoc, repl.eval("raise 'oops'")
RuntimeError: oops
\tfrom #{trace}
END
end
private
def current_trace
caller.first
end
end
end
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