diff options
Diffstat (limited to 'src/math/big/floatconv_test.go')
| -rw-r--r-- | src/math/big/floatconv_test.go | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/math/big/floatconv_test.go b/src/math/big/floatconv_test.go index b2a1ab05fc..edcb2eb105 100644 --- a/src/math/big/floatconv_test.go +++ b/src/math/big/floatconv_test.go @@ -5,6 +5,7 @@ package big import ( + "bytes" "fmt" "math" "strconv" @@ -665,3 +666,54 @@ func BenchmarkParseFloatLargeExp(b *testing.B) { } } } + +func TestFloatScan(t *testing.T) { + var floatScanTests = []struct { + input string + format string + output string + remaining int + wantErr bool + }{ + 0: {"10.0", "%f", "10", 0, false}, + 1: {"23.98+2.0", "%v", "23.98", 4, false}, + 2: {"-1+1", "%v", "-1", 2, false}, + 3: {" 00000", "%v", "0", 0, false}, + 4: {"-123456p-78", "%b", "-4.084816388e-19", 0, false}, + 5: {"+123", "%b", "123", 0, false}, + 6: {"-1.234e+56", "%e", "-1.234e+56", 0, false}, + 7: {"-1.234E-56", "%E", "-1.234e-56", 0, false}, + 8: {"-1.234e+567", "%g", "-1.234e+567", 0, false}, + 9: {"+1234567891011.234", "%G", "1.234567891e+12", 0, false}, + + // Scan doesn't handle ±Inf. + 10: {"Inf", "%v", "", 3, true}, + 11: {"-Inf", "%v", "", 3, true}, + 12: {"-Inf", "%v", "", 3, true}, + } + + var buf bytes.Buffer + for i, test := range floatScanTests { + x := new(Float) + buf.Reset() + buf.WriteString(test.input) + _, err := fmt.Fscanf(&buf, test.format, x) + if test.wantErr { + if err == nil { + t.Errorf("#%d want non-nil err", i) + } + continue + } + + if err != nil { + t.Errorf("#%d error: %s", i, err) + } + + if x.String() != test.output { + t.Errorf("#%d got %s; want %s", i, x.String(), test.output) + } + if buf.Len() != test.remaining { + t.Errorf("#%d got %d bytes remaining; want %d", i, buf.Len(), test.remaining) + } + } +} |