Graham McIntire
7d0978f7d5
Maidenhead grid module converts grid squares to lat/lon coordinates. Submission form validates grids, bands, modes, and email, computes positions and distance, then triggers the weather/HRRR/terrain processing pipeline via Oban.
94 lines
2.8 KiB
Elixir
94 lines
2.8 KiB
Elixir
defmodule Microwaveprop.Radio.MaidenheadTest do
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use ExUnit.Case, async: true
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alias Microwaveprop.Radio.Maidenhead
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describe "valid?/1" do
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test "accepts valid 4-char grid" do
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assert Maidenhead.valid?("EM12")
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end
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test "accepts valid 6-char grid" do
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assert Maidenhead.valid?("EM12ab")
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end
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test "is case-insensitive" do
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assert Maidenhead.valid?("em12")
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assert Maidenhead.valid?("EM12AB")
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assert Maidenhead.valid?("em12ab")
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end
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test "rejects field chars outside A-R" do
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refute Maidenhead.valid?("SZ12")
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end
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test "rejects subsquare chars outside a-x" do
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refute Maidenhead.valid?("EM12yz")
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end
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test "rejects wrong length" do
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refute Maidenhead.valid?("EM1")
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refute Maidenhead.valid?("EM123")
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refute Maidenhead.valid?("EM12abc")
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end
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test "rejects non-digit in square positions" do
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refute Maidenhead.valid?("EMAB")
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end
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test "rejects empty string" do
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refute Maidenhead.valid?("")
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end
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test "rejects nil" do
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refute Maidenhead.valid?(nil)
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end
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end
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describe "to_latlon/1" do
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test "returns center of 4-char grid FN31" do
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# FN31: F=5, N=13 -> lon = 5*20 - 180 + 3*2 + 1 = -73, lat = 13*10 - 90 + 1*1 + 0.5 = 41.5
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assert {:ok, {lat, lon}} = Maidenhead.to_latlon("FN31")
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assert_in_delta lat, 41.5, 0.01
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assert_in_delta lon, -73.0, 0.01
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end
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test "returns center of 6-char grid FN31pr" do
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# FN31pr: field F=5,N=13; square 3,1; subsquare p=15,r=17
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# lon = 5*20 - 180 + 3*2 + 15*(5/60) + (5/120) = -100 + 6 + 1.25 + 0.0417 = -72.7083
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# lat = 13*10 - 90 + 1*1 + 17*(2.5/60) + (2.5/120) = 40 + 1 + 0.7083 + 0.02083 = 41.7292
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assert {:ok, {lat, lon}} = Maidenhead.to_latlon("FN31pr")
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assert_in_delta lat, 41.7292, 0.01
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assert_in_delta lon, -72.7083, 0.01
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end
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test "is case-insensitive" do
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assert {:ok, {lat1, lon1}} = Maidenhead.to_latlon("FN31")
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assert {:ok, {lat2, lon2}} = Maidenhead.to_latlon("fn31")
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assert lat1 == lat2
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assert lon1 == lon2
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end
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test "returns :error for invalid grid" do
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assert :error = Maidenhead.to_latlon("ZZ99")
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end
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test "returns :error for nil" do
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assert :error = Maidenhead.to_latlon(nil)
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end
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test "AA00 returns southwest corner center" do
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# lon = 0*20 - 180 + 0*2 + 1 = -179, lat = 0*10 - 90 + 0*1 + 0.5 = -89.5
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assert {:ok, {lat, lon}} = Maidenhead.to_latlon("AA00")
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assert_in_delta lat, -89.5, 0.01
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assert_in_delta lon, -179.0, 0.01
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end
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test "RR99 returns northeast corner center" do
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# lon = 17*20 - 180 + 9*2 + 1 = 179, lat = 17*10 - 90 + 9*1 + 0.5 = 89.5
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assert {:ok, {lat, lon}} = Maidenhead.to_latlon("RR99")
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assert_in_delta lat, 89.5, 0.01
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assert_in_delta lon, 179.0, 0.01
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end
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end
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end
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