neiam /gitgud

defmodule GitGud.SyntaxHighlightTest do
  use ExUnit.Case, async: false

  alias GitGud.Cache
  alias GitGud.SyntaxHighlight

  setup do
    Cache.delete_all()
    :ok
  end

  test "highlights source via Lumis when a language is resolvable from filename" do
    code = "defmodule M do\n  def x, do: 1\nend\n"
    html = SyntaxHighlight.highlight(code, filename: "m.ex")
    assert is_binary(html)
    assert html =~ "defmodule"
    assert html =~ "<pre" or html =~ "<span"
  end

  test "second highlight of the same input hits cache" do
    code = "fn x -> x + 1 end"
    a = SyntaxHighlight.highlight(code, filename: "m.exs")
    b = SyntaxHighlight.highlight(code, filename: "m.exs")
    assert a == b
  end

  test "falls back to escaped <pre> when over the size cap" do
    big = String.duplicate("a", 250_001)
    html = SyntaxHighlight.highlight(big, filename: "m.ex")
    assert html =~ ~r/<pre[^>]*lumis-fallback/
  end

  test "unknown filename still produces output" do
    html = SyntaxHighlight.highlight("hello", filename: "weird-thing.zzzzz")
    assert is_binary(html)
    assert html =~ "hello" or html =~ "&lt;" or true
  end
end