clerk/internal/decimal/decimal_test.go (view raw)
| 1 | package decimal |
| 2 | |
| 3 | import "testing" |
| 4 | |
| 5 | func TestNewFromString(t *testing.T) { |
| 6 | tests := []struct{ in, want string }{ |
| 7 | {"10.00", "10"}, |
| 8 | {"150.60", "150.6"}, |
| 9 | {".33", "0.33"}, |
| 10 | {"1.", "1"}, |
| 11 | {"0001.2300", "1.23"}, |
| 12 | {"0", "0"}, |
| 13 | {"0.00", "0"}, |
| 14 | {"-0.00", "0"}, |
| 15 | {"-20", "-20"}, |
| 16 | {"-.75", "-0.75"}, |
| 17 | } |
| 18 | for _, tt := range tests { |
| 19 | got, err := FromString(tt.in) |
| 20 | if err != nil { |
| 21 | t.Fatalf("NewFromString(%q) unexpected error: %v", tt.in, err) |
| 22 | } |
| 23 | if got.String() != tt.want { |
| 24 | t.Fatalf("NewFromString(%q).String() = %q, want %q", tt.in, got.String(), tt.want) |
| 25 | } |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | func TestNewFromStringInvalid(t *testing.T) { |
| 30 | tests := []string{ |
| 31 | "", |
| 32 | ".", |
| 33 | "+", |
| 34 | "-", |
| 35 | "1_000.00", |
| 36 | "1,000.00", |
| 37 | "1..0", |
| 38 | "a1", |
| 39 | "1a", |
| 40 | } |
| 41 | for _, in := range tests { |
| 42 | if _, err := FromString(in); err == nil { |
| 43 | t.Fatalf("NewFromString(%q) expected error", in) |
| 44 | } |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func TestArithmetic(t *testing.T) { |
| 49 | a, _ := FromString("1.20") |
| 50 | b, _ := FromString(".30") |
| 51 | |
| 52 | if got := a.Add(b).String(); got != "1.5" { |
| 53 | t.Fatalf("a+b = %q, want %q", got, "1.5") |
| 54 | } |
| 55 | if got := a.Sub(b).String(); got != "0.9" { |
| 56 | t.Fatalf("a-b = %q, want %q", got, "0.9") |
| 57 | } |
| 58 | if got := a.Mul(b).String(); got != "0.36" { |
| 59 | t.Fatalf("a*b = %q, want %q", got, "0.36") |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | func TestCmpAndNeg(t *testing.T) { |
| 64 | a, _ := FromString("1.0") |
| 65 | b, _ := FromString("1") |
| 66 | c, _ := FromString("1.01") |
| 67 | |
| 68 | if a.Cmp(b) != 0 { |
| 69 | t.Fatalf("expected %q and %q to be equal", a.String(), b.String()) |
| 70 | } |
| 71 | if b.Cmp(c) >= 0 { |
| 72 | t.Fatalf("expected %q to be less than %q", b.String(), c.String()) |
| 73 | } |
| 74 | if got := b.Neg().String(); got != "-1" { |
| 75 | t.Fatalf("Neg(1) = %q, want %q", got, "-1") |
| 76 | } |
| 77 | if got := (Decimal{}).Neg().String(); got != "0" { |
| 78 | t.Fatalf("Neg(0) = %q, want %q", got, "0") |
| 79 | } |
| 80 | } |