github.com/bingoohuang/gg@v0.0.0-20240325092523-45da7dee9335/pkg/man/si_test.go (about)

     1  package man
     2  
     3  import (
     4  	"math"
     5  	"testing"
     6  )
     7  
     8  func TestSI(t *testing.T) {
     9  	tests := []struct {
    10  		name      string
    11  		num       float64
    12  		formatted string
    13  	}{
    14  		{"e-24", 1e-24, "1 yF"},
    15  		{"e-21", 1e-21, "1 zF"},
    16  		{"e-18", 1e-18, "1 aF"},
    17  		{"e-15", 1e-15, "1 fF"},
    18  		{"e-12", 1e-12, "1 pF"},
    19  		{"e-12", 2.2345e-12, "2.2345 pF"},
    20  		{"e-12", 2.23e-12, "2.23 pF"},
    21  		{"e-11", 2.23e-11, "22.3 pF"},
    22  		{"e-10", 2.2e-10, "220 pF"},
    23  		{"e-9", 2.2e-9, "2.2 nF"},
    24  		{"e-8", 2.2e-8, "22 nF"},
    25  		{"e-7", 2.2e-7, "220 nF"},
    26  		{"e-6", 2.2e-6, "2.2 µF"},
    27  		{"e-6", 1e-6, "1 µF"},
    28  		{"e-5", 2.2e-5, "22 µF"},
    29  		{"e-4", 2.2e-4, "220 µF"},
    30  		{"e-3", 2.2e-3, "2.2 mF"},
    31  		{"e-2", 2.2e-2, "22 mF"},
    32  		{"e-1", 2.2e-1, "220 mF"},
    33  		{"e+0", 2.2e-0, "2.2 F"},
    34  		{"e+0", 2.2, "2.2 F"},
    35  		{"e+1", 2.2e+1, "22 F"},
    36  		{"0", 0, "0 F"},
    37  		{"e+1", 22, "22 F"},
    38  		{"e+2", 2.2e+2, "220 F"},
    39  		{"e+2", 220, "220 F"},
    40  		{"e+3", 2.2e+3, "2.2 kF"},
    41  		{"e+3", 2200, "2.2 kF"},
    42  		{"e+4", 2.2e+4, "22 kF"},
    43  		{"e+4", 22000, "22 kF"},
    44  		{"e+5", 2.2e+5, "220 kF"},
    45  		{"e+6", 2.2e+6, "2.2 MF"},
    46  		{"e+6", 1e+6, "1 MF"},
    47  		{"e+7", 2.2e+7, "22 MF"},
    48  		{"e+8", 2.2e+8, "220 MF"},
    49  		{"e+9", 2.2e+9, "2.2 GF"},
    50  		{"e+10", 2.2e+10, "22 GF"},
    51  		{"e+11", 2.2e+11, "220 GF"},
    52  		{"e+12", 2.2e+12, "2.2 TF"},
    53  		{"e+15", 2.2e+15, "2.2 PF"},
    54  		{"e+18", 2.2e+18, "2.2 EF"},
    55  		{"e+21", 2.2e+21, "2.2 ZF"},
    56  		{"e+24", 2.2e+24, "2.2 YF"},
    57  
    58  		// special case
    59  		{"1F", 1000 * 1000, "1 MF"},
    60  		{"1F", 1e6, "1 MF"},
    61  
    62  		// negative number
    63  		{"-100 F", -100, "-100 F"},
    64  	}
    65  
    66  	for _, test := range tests {
    67  		got := SI(test.num, "F")
    68  		if got != test.formatted {
    69  			t.Errorf("On %v (%v), got %v, wanted %v",
    70  				test.name, test.num, got, test.formatted)
    71  		}
    72  
    73  		gotf, gotu, err := ParseSI(test.formatted)
    74  		if err != nil {
    75  			t.Errorf("Error parsing %v (%v): %v", test.name, test.formatted, err)
    76  			continue
    77  		}
    78  
    79  		if math.Abs(1-(gotf/test.num)) > 0.01 {
    80  			t.Errorf("On %v (%v), got %v, wanted %v (±%v)",
    81  				test.name, test.formatted, gotf, test.num,
    82  				math.Abs(1-(gotf/test.num)))
    83  		}
    84  		if gotu != "F" {
    85  			t.Errorf("On %v (%v), expected unit F, got %v",
    86  				test.name, test.formatted, gotu)
    87  		}
    88  	}
    89  
    90  	// Parse error
    91  	gotf, gotu, err := ParseSI("x1.21JW") // 1.21 jigga whats
    92  	if err == nil {
    93  		t.Errorf("Expected error on x1.21JW, got %v %v", gotf, gotu)
    94  	}
    95  }
    96  
    97  func TestSIWithDigits(t *testing.T) {
    98  	tests := []struct {
    99  		name      string
   100  		num       float64
   101  		digits    int
   102  		formatted string
   103  	}{
   104  		{"e-12", 2.234e-12, 0, "2 pF"},
   105  		{"e-12", 2.234e-12, 1, "2.2 pF"},
   106  		{"e-12", 2.234e-12, 2, "2.23 pF"},
   107  		{"e-12", 2.234e-12, 3, "2.234 pF"},
   108  		{"e-12", 2.234e-12, 4, "2.234 pF"},
   109  	}
   110  
   111  	for _, test := range tests {
   112  		got := SIWithDigits(test.num, test.digits, "F")
   113  		if got != test.formatted {
   114  			t.Errorf("On %v (%v), got %v, wanted %v",
   115  				test.name, test.num, got, test.formatted)
   116  		}
   117  	}
   118  }
   119  
   120  func BenchmarkParseSI(b *testing.B) {
   121  	for i := 0; i < b.N; i++ {
   122  		ParseSI("2.2346ZB")
   123  	}
   124  }