defmodule Microwaveprop.Weather.MrmsClientTest do
use ExUnit.Case, async: true
alias Microwaveprop.Weather.MrmsClient
describe "parse_listing/1" do
test "extracts all unique filenames from a listing fragment" do
html = """
...
...
...
"""
entries =
html
|> MrmsClient.parse_listing()
|> Enum.sort_by(& &1.valid_time, DateTime)
assert [
%{valid_time: ~U[2026-04-12 19:24:00Z]},
%{valid_time: ~U[2026-04-12 19:26:00Z]},
%{valid_time: ~U[2026-04-12 19:28:00Z]}
] = entries
end
test "drops filenames with malformed timestamps" do
html = """
...
...
"""
assert [%{valid_time: ~U[2026-04-12 19:30:00Z]}] = MrmsClient.parse_listing(html)
end
test "deduplicates identical filenames (directory indexes often list twice)" do
html = """
file
file
"""
assert [%{}] = MrmsClient.parse_listing(html)
end
end
describe "flatten_rain_grid/1" do
test "keeps positive rain rates keyed by lat/lon" do
cells = %{
{32.0, -97.0} => %{"PrecipRate:0 m above mean sea level" => 5.4},
{32.125, -97.0} => %{"PrecipRate:0 m above mean sea level" => 0.0}
}
assert MrmsClient.flatten_rain_grid(cells) ==
%{{32.0, -97.0} => 5.4, {32.125, -97.0} => 0.0}
end
test "drops missing-value sentinels (-3 or less)" do
cells = %{
{32.0, -97.0} => %{"PrecipRate:0 m above mean sea level" => -3.0},
{32.125, -97.0} => %{"PrecipRate:0 m above mean sea level" => 12.5}
}
assert MrmsClient.flatten_rain_grid(cells) == %{{32.125, -97.0} => 12.5}
end
test "drops entries with no PrecipRate field at all" do
cells = %{{32.0, -97.0} => %{"OTHER:sfc" => 1.0}}
assert MrmsClient.flatten_rain_grid(cells) == %{}
end
end
end