43c2bbdd71
For assertions that contain function calls, displaying just the
expression is not helpful. For e.g.
Assertion failed
String.upcase("foo") == "Foo"
The learner is given no extra information to help them learn. Sure they
might consult the documentation (and should!), but perhaps a better
experience would be for us to inform the learner about the values it
encountered.
Assertion failed
String.upcase("foo") == "Foo"
left: "FOO"
right: "Foo"
Learner: 💡 ah hah! it upcases the whole string! 💫
46 lines
1.2 KiB
Elixir
46 lines
1.2 KiB
Elixir
defmodule Display.Failure do
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alias Display.Paint
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@no_value :ex_unit_no_meaningful_value
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def format_failure(%{error: %ExUnit.AssertionError{expr: @no_value, message: message}, file: file, line: line}) do
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"""
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#{Paint.cyan("Assertion failed in #{file}:#{line}")}
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#{Paint.red(message)}
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"""
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end
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def format_failure(%{error: %ExUnit.AssertionError{expr: expr} = error, file: file, line: line}) do
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"""
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#{Paint.cyan("Assertion failed in #{file}:#{line}")}
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#{Paint.red(Macro.to_string(expr))}
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"""
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|> format_inequality(error)
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end
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def format_failure(%{error: error, file: file, line: line}) do
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"""
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#{Paint.cyan("Error in #{file}:#{line}")}
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#{format_error(error)}
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"""
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end
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defp format_inequality(message, %{left: @no_value, right: @no_value}) do
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message
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end
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defp format_inequality(message, %{left: left, right: right}) do
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"""
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#{message}
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left: #{left |> inspect |> Paint.yellow}
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right: #{right |> inspect |> Paint.yellow}
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"""
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end
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defp format_error(error) do
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trace = System.stacktrace |> Enum.take(2)
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Paint.red(Exception.format(:error, error, trace))
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end
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def show_compile_error(error) do
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format_error(error)
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end
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end
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