62 lines
1.9 KiB
Elixir
62 lines
1.9 KiB
Elixir
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defmodule Rsh26pool.JSTTest do
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use ExUnit.Case, async: true
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alias Rsh26pool.JST
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describe "parse_local/1" do
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test "interprets the input as wall-clock JST and returns UTC (-9h)" do
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assert JST.parse_local("2026-07-04T18:00") == {:ok, ~U[2026-07-04 09:00:00Z]}
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end
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test "accepts a value that already carries seconds" do
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assert JST.parse_local("2026-07-04T18:00:30") == {:ok, ~U[2026-07-04 09:00:30Z]}
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end
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test "shifts across the date boundary when JST wall time is early morning" do
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# 2026-07-04 05:00 JST is the previous UTC day at 20:00.
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assert JST.parse_local("2026-07-04T05:00") == {:ok, ~U[2026-07-03 20:00:00Z]}
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end
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test "returns :error on unparseable text" do
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assert JST.parse_local("garbage") == :error
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end
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test "returns :error for non-binary input" do
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assert JST.parse_local(nil) == :error
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assert JST.parse_local(1234) == :error
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end
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end
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describe "to_local/1 and format/1" do
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test "to_local shifts a stored UTC datetime forward by 9 hours" do
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assert JST.to_local(~U[2026-07-04 09:00:00Z]) == ~U[2026-07-04 18:00:00Z]
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end
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test "format renders the stored UTC datetime as JST wall time" do
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assert JST.format(~U[2026-07-04 09:00:00Z]) == "2026/07/04 18:00"
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end
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test "format(nil) is the empty string" do
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assert JST.format(nil) == ""
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end
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end
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describe "parse_local |> format round-trip" do
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test "is the identity on the wall clock at minute precision" do
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wall_times = [
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"2026-07-04T18:00",
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"2026-01-01T00:00",
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"2026-12-31T23:59",
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"2026-03-15T09:05",
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"2026-07-04T05:00"
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]
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for wall <- wall_times do
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assert {:ok, utc} = JST.parse_local(wall)
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expected = wall |> String.replace("-", "/") |> String.replace("T", " ")
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assert JST.format(utc) == expected
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end
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end
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end
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end
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