Add SPC provider parsing helpers

internal/providers/spc/geojson_test.go

@@ -0,0 +1,90 @@
+package spc
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestDecodeGeoJSONExposesSPCPropertiesAndCompactGeometry(t *testing.T) {
+	raw := readTestFile(t, "day1_cat.geojson")
+
+	got, err := DecodeGeoJSON(raw)
+	if err != nil {
+		t.Fatalf("DecodeGeoJSON() error = %v", err)
+	}
+	if got.Type != "FeatureCollection" {
+		t.Fatalf("Type = %q, want FeatureCollection", got.Type)
+	}
+	if len(got.Features) != 1 {
+		t.Fatalf("Features length = %d, want 1", len(got.Features))
+	}
+
+	feature := got.Features[0]
+	props := feature.Properties
+	if props.ValidISO != "2026-06-11T13:00:00Z" {
+		t.Fatalf("VALID_ISO = %q", props.ValidISO)
+	}
+	if props.ExpireISO != "2026-06-12T12:00:00Z" {
+		t.Fatalf("EXPIRE_ISO = %q", props.ExpireISO)
+	}
+	if props.IssueISO != "2026-06-11T12:34:56Z" {
+		t.Fatalf("ISSUE_ISO = %q", props.IssueISO)
+	}
+	if props.Forecaster != "SMITH" {
+		t.Fatalf("FORECASTER = %q", props.Forecaster)
+	}
+	if props.Label != "SLGT" {
+		t.Fatalf("LABEL = %q", props.Label)
+	}
+	if props.Label2 != "Slight Risk" {
+		t.Fatalf("LABEL2 = %q", props.Label2)
+	}
+	if props.DN == nil || *props.DN != 3 {
+		t.Fatalf("DN = %v, want 3", props.DN)
+	}
+
+	wantGeometry := `{"type":"Polygon","coordinates":[[[-91.0,38.0],[-90.0,38.0],[-90.0,39.0],[-91.0,39.0],[-91.0,38.0]]]}`
+	if string(feature.Geometry) != wantGeometry {
+		t.Fatalf("Geometry = %s, want %s", feature.Geometry, wantGeometry)
+	}
+	if strings.Contains(string(feature.Geometry), "\n") || strings.Contains(string(feature.Geometry), "  ") {
+		t.Fatalf("Geometry is not compact: %q", feature.Geometry)
+	}
+}
+
+func TestDecodeGeoJSONParsesSeverityRankString(t *testing.T) {
+	raw := readTestFile(t, "day2_torn.geojson")
+
+	got, err := DecodeGeoJSON(raw)
+	if err != nil {
+		t.Fatalf("DecodeGeoJSON() error = %v", err)
+	}
+	props := got.Features[0].Properties
+	if props.DN == nil || *props.DN != 5 {
+		t.Fatalf("DN = %v, want 5", props.DN)
+	}
+}
+
+func TestParseISOTimestampTrimsAndReturnsUTC(t *testing.T) {
+	got, err := ParseISOTimestamp(" 2026-06-11T12:34:56Z ")
+	if err != nil {
+		t.Fatalf("ParseISOTimestamp() error = %v", err)
+	}
+	want := time.Date(2026, 6, 11, 12, 34, 56, 0, time.UTC)
+	if !got.Equal(want) {
+		t.Fatalf("ParseISOTimestamp() = %s, want %s", got, want)
+	}
+}
+
+func readTestFile(t *testing.T, name string) []byte {
+	t.Helper()
+	path := filepath.Join("testdata", name)
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read %s: %v", path, err)
+	}
+	return raw
+}