1 files changed, 75 insertions, 0 deletions
diff --git a/mountain_pass/downloader_test.go b/mountain_pass/downloader_test.go
new file mode 100644
index 0000000..f4ffcc8
--- /dev/null
+++ b/mountain_pass/downloader_test.go
@@ -0,0 +1,75 @@
+package mountainpass
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseMountainPasses(t *testing.T) {
+	csv := "Brevet\tcode\tnom\taltitude\n" +
+		"FR-01\tFR-01-1500\tCol du Colombier\t1498\n" +
+		"FR-06\tFR-06-0730c | FR-06-0706\tCol de Castillon | Col de Castillon (Tunnel)\t730 | 706\n" +
+		"FR-13\tFR-13-0135\tCol du Télégraphe \"Chappe\"\t149\n" +
+		"FR-90\tFR-88-1171\tCol du Ballon d'Alsace\t1171\n"
+	mountainPasses, err := parseMountainPasses(strings.NewReader(csv))
+	require.NoError(t, err)
+
+	expected := []MountainPass{
+		{ExternalID: "centcols/FR-01-1500", CountryCode: "FR", DepartmentCode: "01", Name: "Col du Colombier", Elevation: 1498},
+		{ExternalID: "centcols/FR-06-0730c", CountryCode: "FR", DepartmentCode: "06", Name: "Col de Castillon", Elevation: 730},
+		{ExternalID: "centcols/FR-06-0706", CountryCode: "FR", DepartmentCode: "06", Name: "Col de Castillon (Tunnel)", Elevation: 706},
+		{ExternalID: "centcols/FR-13-0135", CountryCode: "FR", DepartmentCode: "13", Name: "Col du Télégraphe \"Chappe\"", Elevation: 149},
+		{ExternalID: "centcols/FR-88-1171", CountryCode: "FR", DepartmentCode: "90", Name: "Col du Ballon d'Alsace", Elevation: 1171},
+	}
+	assert.Equal(t, expected, mountainPasses)
+}
+
+func TestParseMountainPassesHeaderOnly(t *testing.T) {
+	mountainPasses, err := parseMountainPasses(strings.NewReader("Brevet\tcode\tnom\taltitude\n"))
+	require.NoError(t, err)
+	assert.Empty(t, mountainPasses)
+}
+
+func TestSplitCountryDepartment(t *testing.T) {
+	country, department, err := splitCountryDepartment("FR-01")
+	require.NoError(t, err)
+	assert.Equal(t, "FR", country)
+	assert.Equal(t, "01", department)
+
+	_, _, err = splitCountryDepartment("F-01-2")
+	assert.Error(t, err)
+}
+
+func TestLoadCachedDepartment(t *testing.T) {
+	cacheFile := filepath.Join(t.TempDir(), "debug_department_01.csv")
+	err := os.WriteFile(cacheFile, []byte("Brevet\tcode\tnom\taltitude\nFR-01\tFR-01-1500\tCol du Colombier\t1498\n"), 0644)
+	require.NoError(t, err)
+
+	mountainPasses, found, err := loadCachedDepartment(cacheFile)
+	require.NoError(t, err)
+	assert.True(t, found)
+	assert.Equal(t, []MountainPass{{ExternalID: "centcols/FR-01-1500", CountryCode: "FR", DepartmentCode: "01", Name: "Col du Colombier", Elevation: 1498}}, mountainPasses)
+}
+
+func TestLoadCachedDepartmentMissing(t *testing.T) {
+	mountainPasses, found, err := loadCachedDepartment(filepath.Join(t.TempDir(), "does-not-exist.csv"))
+	require.NoError(t, err)
+	assert.False(t, found)
+	assert.Nil(t, mountainPasses)
+}
+
+func TestLoadCachedDepartmentCorrupt(t *testing.T) {
+	cacheFile := filepath.Join(t.TempDir(), "debug_department_01.csv")
+	err := os.WriteFile(cacheFile, []byte("Brevet\tcode\tnom\taltitude\nFR-01\n"), 0644)
+	require.NoError(t, err)
+
+	mountainPasses, found, err := loadCachedDepartment(cacheFile)
+	require.NoError(t, err)
+	assert.False(t, found)
+	assert.Nil(t, mountainPasses)
+}