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package humanize
import (
"math"
"testing"
)
func TestSI(t *testing.T) {
tests := []struct {
name string
num float64
formatted string
}{
{"e-30", 1e-30, "1 qF"},
{"e-27", 1e-27, "1 rF"},
{"e-24", 1e-24, "1 yF"},
{"e-21", 1e-21, "1 zF"},
{"e-18", 1e-18, "1 aF"},
{"e-15", 1e-15, "1 fF"},
{"e-12", 1e-12, "1 pF"},
{"e-12", 2.2345e-12, "2.2345 pF"},
{"e-12", 2.23e-12, "2.23 pF"},
{"e-11", 2.23e-11, "22.3 pF"},
{"e-10", 2.2e-10, "220 pF"},
{"e-9", 2.2e-9, "2.2 nF"},
{"e-8", 2.2e-8, "22 nF"},
{"e-7", 2.2e-7, "220 nF"},
{"e-6", 2.2e-6, "2.2 µF"},
{"e-6", 1e-6, "1 µF"},
{"e-5", 2.2e-5, "22 µF"},
{"e-4", 2.2e-4, "220 µF"},
{"e-3", 2.2e-3, "2.2 mF"},
{"e-2", 2.2e-2, "22 mF"},
{"e-1", 2.2e-1, "220 mF"},
{"e+0", 2.2e-0, "2.2 F"},
{"e+0", 2.2, "2.2 F"},
{"e+1", 2.2e+1, "22 F"},
{"0", 0, "0 F"},
{"e+1", 22, "22 F"},
{"e+2", 2.2e+2, "220 F"},
{"e+2", 220, "220 F"},
{"e+3", 2.2e+3, "2.2 kF"},
{"e+3", 2200, "2.2 kF"},
{"e+4", 2.2e+4, "22 kF"},
{"e+4", 22000, "22 kF"},
{"e+5", 2.2e+5, "220 kF"},
{"e+6", 2.2e+6, "2.2 MF"},
{"e+6", 1e+6, "1 MF"},
{"e+7", 2.2e+7, "22 MF"},
{"e+8", 2.2e+8, "220 MF"},
{"e+9", 2.2e+9, "2.2 GF"},
{"e+10", 2.2e+10, "22 GF"},
{"e+11", 2.2e+11, "220 GF"},
{"e+12", 2.2e+12, "2.2 TF"},
{"e+15", 2.2e+15, "2.2 PF"},
{"e+18", 2.2e+18, "2.2 EF"},
{"e+21", 2.2e+21, "2.2 ZF"},
{"e+24", 2.2e+24, "2.2 YF"},
{"e+27", 2.2e+27, "2.2 RF"},
{"e+30", 2.2e+30, "2.2 QF"},
// special case
{"1F", 1000 * 1000, "1 MF"},
{"1F", 1e6, "1 MF"},
// negative number
{"-100 F", -100, "-100 F"},
}
for _, test := range tests {
got := SI(test.num, "F")
if got != test.formatted {
t.Errorf("On %v (%v), got %v, wanted %v",
test.name, test.num, got, test.formatted)
}
gotf, gotu, err := ParseSI(test.formatted)
if err != nil {
t.Errorf("Error parsing %v (%v): %v", test.name, test.formatted, err)
continue
}
if math.Abs(1-(gotf/test.num)) > 0.01 {
t.Errorf("On %v (%v), got %v, wanted %v (±%v)",
test.name, test.formatted, gotf, test.num,
math.Abs(1-(gotf/test.num)))
}
if gotu != "F" {
t.Errorf("On %v (%v), expected unit F, got %v",
test.name, test.formatted, gotu)
}
}
// Parse error
gotf, gotu, err := ParseSI("x1.21JW") // 1.21 jigga whats
if err == nil {
t.Errorf("Expected error on x1.21JW, got %v %v", gotf, gotu)
}
}
func TestSIWithDigits(t *testing.T) {
tests := []struct {
name string
num float64
digits int
formatted string
}{
{"e-12", 2.234e-12, 0, "2 pF"},
{"e-12", 2.234e-12, 1, "2.2 pF"},
{"e-12", 2.234e-12, 2, "2.23 pF"},
{"e-12", 2.234e-12, 3, "2.234 pF"},
{"e-12", 2.234e-12, 4, "2.234 pF"},
}
for _, test := range tests {
got := SIWithDigits(test.num, test.digits, "F")
if got != test.formatted {
t.Errorf("On %v (%v), got %v, wanted %v",
test.name, test.num, got, test.formatted)
}
}
}
func BenchmarkParseSI(b *testing.B) {
for i := 0; i < b.N; i++ {
ParseSI("2.2346ZB")
}
}
// There was a report that zeroes were being truncated incorrectly
func TestBug106(t *testing.T) {
tests := []struct{
in float64
want string
}{
{20.0, "20 U"},
{200.0, "200 U"},
}
for _, test := range tests {
if got :=SIWithDigits(test.in, 0, "U") ; got != test.want {
t.Errorf("on %f got %v, want %v", test.in, got, test.want);
}
}
}
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