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https://github.com/livebook-dev/livebook.git
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47 lines
1.6 KiB
Elixir
47 lines
1.6 KiB
Elixir
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defmodule LiveBook.JSInteropTest do
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use ExUnit.Case, async: true
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alias LiveBook.{JSInterop, Delta}
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describe "apply_delta_to_string/2" do
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test "prepend" do
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string = "cats"
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delta = Delta.new() |> Delta.insert("fat ")
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assert JSInterop.apply_delta_to_string(delta, string) == "fat cats"
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end
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test "insert in the middle" do
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string = "cats"
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delta = Delta.new() |> Delta.retain(3) |> Delta.insert("'")
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assert JSInterop.apply_delta_to_string(delta, string) == "cat's"
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end
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test "delete" do
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string = "cats"
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delta = Delta.new() |> Delta.retain(1) |> Delta.delete(2)
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assert JSInterop.apply_delta_to_string(delta, string) == "cs"
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end
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test "replace" do
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string = "cats"
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delta = Delta.new() |> Delta.retain(1) |> Delta.delete(2) |> Delta.insert("ar")
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assert JSInterop.apply_delta_to_string(delta, string) == "cars"
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end
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test "retain skips the given number UTF-16 code units" do
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# 🚀 consists of 2 UTF-16 code units, so JavaScript assumes "🚀".length is 2
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string = "🚀 cats"
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# Skip the emoji (2 code unit) and the space (1 code unit)
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delta = Delta.new() |> Delta.retain(3) |> Delta.insert("my ")
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assert JSInterop.apply_delta_to_string(delta, string) == "🚀 my cats"
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end
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test "delete removes the given number UTF-16 code units" do
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# 🚀 consists of 2 UTF-16 code units, so JavaScript assumes "🚀".length is 2
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string = "🚀 cats"
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delta = Delta.new() |> Delta.delete(2)
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assert JSInterop.apply_delta_to_string(delta, string) == " cats"
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end
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end
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end
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