| 1 | // internal/geo/tz_test.go |
| 2 | package geo |
| 3 | |
| 4 | import ( |
| 5 | "strings" |
| 6 | "testing" |
| 7 | ) |
| 8 | |
| 9 | func TestZonePoint(t *testing.T) { |
| 10 | mapped := []string{ |
| 11 | "Europe/London", "Europe/Dublin", "Europe/Amsterdam", |
| 12 | "Asia/Kolkata", "Asia/Calcutta", |
| 13 | "America/Argentina/Buenos_Aires", "europe/london", |
| 14 | } |
| 15 | for _, z := range mapped { |
| 16 | if _, ok := ZonePoint(z); !ok { |
| 17 | t.Errorf("ZonePoint(%q) unmapped, want a point", z) |
| 18 | } |
| 19 | } |
| 20 | a, _ := ZonePoint("Asia/Calcutta") |
| 21 | b, _ := ZonePoint("Asia/Kolkata") |
| 22 | if a != b { |
| 23 | t.Errorf("Asia/Calcutta %v != Asia/Kolkata %v; the link must resolve to one point", a, b) |
| 24 | } |
| 25 | // Amsterdam is a link to Brussels in tzdata 2026b, but zone.tab gives it |
| 26 | // its own row: zone.tab wins over links (spec §6.2). |
| 27 | am, _ := ZonePoint("Europe/Amsterdam") |
| 28 | br, _ := ZonePoint("Europe/Brussels") |
| 29 | if am == br { |
| 30 | t.Errorf("Europe/Amsterdam = Europe/Brussels = %v; a zone.tab row must win over a link", am) |
| 31 | } |
| 32 | unmapped := []string{ |
| 33 | "", "UTC", "Etc/UTC", "Etc/GMT+5", "GMT", "UCT", "Universal", "Zulu", |
| 34 | "Factory", "Local", "localtime", "posixrules", "../etc/passwd", |
| 35 | "Europe/London/Extra/Deep", strings.Repeat("A", 65), "Nowhere/Atlantis", |
| 36 | } |
| 37 | for _, z := range unmapped { |
| 38 | if p, ok := ZonePoint(z); ok { |
| 39 | t.Errorf("ZonePoint(%q) = %v, want unmappable", z, p) |
| 40 | } |
| 41 | } |
| 42 | l, _ := ZonePoint("Europe/London") |
| 43 | if l.Lat < 51 || l.Lat > 52 || l.Lon > 0.5 || l.Lon < -0.5 { |
| 44 | t.Errorf("Europe/London = %v, want about 51.5, -0.12", l) |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | // A link cycle must terminate (at most 4 hops) rather than hang. |
| 49 | func TestZonePointLinkLoopTerminates(t *testing.T) { |
| 50 | links := map[string]string{"a/x": "a/y", "a/y": "a/x"} |
| 51 | if _, ok := resolveLinks("a/x", links, map[string]Point{}); ok { |
| 52 | t.Fatal("a link loop resolved to a point") |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | // Every country with more than one zone.tab row needs an override naming |
| 57 | // its principal zone: a tzdata refresh that gives a country a second row |
| 58 | // fails here instead of silently averaging a continent (spec §6.2). |
| 59 | func TestCountryOverridesCoverEveryMultiZoneCountry(t *testing.T) { |
| 60 | for cc, n := range zoneRowsPerCountry() { |
| 61 | if n < 2 { |
| 62 | continue |
| 63 | } |
| 64 | zone, ok := countryOverride[cc] |
| 65 | if !ok { |
| 66 | t.Errorf("country %s has %d zone.tab rows and no override", cc, n) |
| 67 | continue |
| 68 | } |
| 69 | if _, ok := ZonePoint(zone); !ok { |
| 70 | t.Errorf("override for %s names %q, which is not in zone.tab", cc, zone) |
| 71 | } |
| 72 | } |
| 73 | for cc := range countryOverride { |
| 74 | if zoneRowsPerCountry()[cc] < 2 { |
| 75 | t.Errorf("override for %s is unused: it has fewer than two rows", cc) |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | func TestCountryPoint(t *testing.T) { |
| 81 | for _, cc := range []string{"GB", "IE", "US", "AU", "IN", "gb"} { |
| 82 | if _, ok := CountryPoint(cc); !ok { |
| 83 | t.Errorf("CountryPoint(%q) unmapped", cc) |
| 84 | } |
| 85 | } |
| 86 | us, _ := CountryPoint("US") |
| 87 | ny, _ := ZonePoint("America/New_York") |
| 88 | if us != ny { |
| 89 | t.Errorf("US = %v, want its principal zone New York %v", us, ny) |
| 90 | } |
| 91 | if _, ok := CountryPoint("ZZ"); ok { |
| 92 | t.Error("CountryPoint(ZZ) mapped") |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | func TestTZDataVersion(t *testing.T) { |
| 97 | if v := TZDataVersion(); v == "" || strings.ContainsAny(v, " \n") { |
| 98 | t.Fatalf("TZDataVersion = %q", v) |
| 99 | } |
| 100 | } |
| 101 | |
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