NaN
NaN operator checks that data is a float and is not-a-number.
got := math.NaN()
td.Cmp(t, got, td.NaN()) // succeeds
td.Cmp(t, 4.2, td.NaN()) // fails
See also NotNaN.
See also NaN godoc.
Examples
Float32 example
t := &testing.T{}
got := float32(math.NaN())
ok := td.Cmp(t, got, td.NaN(),
"checks %v is not-a-number", got)
fmt.Println("float32(math.NaN()) is float32 not-a-number:", ok)
got = 12
ok = td.Cmp(t, got, td.NaN(),
"checks %v is not-a-number", got)
fmt.Println("float32(12) is float32 not-a-number:", ok)
// Output:
// float32(math.NaN()) is float32 not-a-number: true
// float32(12) is float32 not-a-number: false
Float64 example
t := &testing.T{}
got := math.NaN()
ok := td.Cmp(t, got, td.NaN(),
"checks %v is not-a-number", got)
fmt.Println("math.NaN() is not-a-number:", ok)
got = 12
ok = td.Cmp(t, got, td.NaN(),
"checks %v is not-a-number", got)
fmt.Println("float64(12) is not-a-number:", ok)
// math.NaN() is not-a-number: true
// float64(12) is not-a-number: false
CmpNaN shortcut
func CmpNaN(t TestingT, got any, args ...any) bool
CmpNaN is a shortcut for:
td.Cmp(t, got, td.NaN(), args...)
See above for details.
Returns true if the test is OK, false if it fails.
If t is a *T then its Config field is inherited.
args… are optional and allow to name the test. This name is
used in case of failure to qualify the test. If len(args) > 1 and
the first item of args is a string and contains a ‘%’ rune then
fmt.Fprintf is used to compose the name, else args are passed to
fmt.Fprint. Do not forget it is the name of the test, not the
reason of a potential failure.
See also CmpNaN godoc.
Examples
Float32 example
t := &testing.T{}
got := float32(math.NaN())
ok := td.CmpNaN(t, got,
"checks %v is not-a-number", got)
fmt.Println("float32(math.NaN()) is float32 not-a-number:", ok)
got = 12
ok = td.CmpNaN(t, got,
"checks %v is not-a-number", got)
fmt.Println("float32(12) is float32 not-a-number:", ok)
// Output:
// float32(math.NaN()) is float32 not-a-number: true
// float32(12) is float32 not-a-number: false
Float64 example
t := &testing.T{}
got := math.NaN()
ok := td.CmpNaN(t, got,
"checks %v is not-a-number", got)
fmt.Println("math.NaN() is not-a-number:", ok)
got = 12
ok = td.CmpNaN(t, got,
"checks %v is not-a-number", got)
fmt.Println("float64(12) is not-a-number:", ok)
// math.NaN() is not-a-number: true
// float64(12) is not-a-number: false
T.NaN shortcut
func (t *T) NaN(got any, args ...any) bool
NaN is a shortcut for:
t.Cmp(got, td.NaN(), args...)
See above for details.
Returns true if the test is OK, false if it fails.
args… are optional and allow to name the test. This name is
used in case of failure to qualify the test. If len(args) > 1 and
the first item of args is a string and contains a ‘%’ rune then
fmt.Fprintf is used to compose the name, else args are passed to
fmt.Fprint. Do not forget it is the name of the test, not the
reason of a potential failure.
See also T.NaN godoc.
Examples
Float32 example
t := td.NewT(&testing.T{})
got := float32(math.NaN())
ok := t.NaN(got,
"checks %v is not-a-number", got)
fmt.Println("float32(math.NaN()) is float32 not-a-number:", ok)
got = 12
ok = t.NaN(got,
"checks %v is not-a-number", got)
fmt.Println("float32(12) is float32 not-a-number:", ok)
// Output:
// float32(math.NaN()) is float32 not-a-number: true
// float32(12) is float32 not-a-number: false
Float64 example
t := td.NewT(&testing.T{})
got := math.NaN()
ok := t.NaN(got,
"checks %v is not-a-number", got)
fmt.Println("math.NaN() is not-a-number:", ok)
got = 12
ok = t.NaN(got,
"checks %v is not-a-number", got)
fmt.Println("float64(12) is not-a-number:", ok)
// math.NaN() is not-a-number: true
// float64(12) is not-a-number: false