Zero
Zero operator checks that data is zero regarding its type.
nil is the zero value of pointers, maps, slices, channels and functions;- 0 is the zero value of numbers;
- "" is the 0 value of strings;
- false is the zero value of booleans;
- zero value of structs is the struct with no fields initialized.
Beware that:
td.Cmp(t, AnyStruct{}, td.Zero()) // is true
td.Cmp(t, &AnyStruct{}, td.Zero()) // is false, coz pointer ≠ nil
td.Cmp(t, &AnyStruct{}, td.Ptr(td.Zero())) // is true
See also Empty, Nil and NotZero.
See also Zero godoc.
Example
Base example
t := &testing.T{}
ok := td.Cmp(t, 0, td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, float64(0), td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, 12, td.Zero()) // fails, as 12 is not 0 :)
fmt.Println(ok)
ok = td.Cmp(t, (map[string]int)(nil), td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, map[string]int{}, td.Zero()) // fails, as not nil
fmt.Println(ok)
ok = td.Cmp(t, ([]int)(nil), td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, []int{}, td.Zero()) // fails, as not nil
fmt.Println(ok)
ok = td.Cmp(t, [3]int{}, td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, [3]int{0, 1}, td.Zero()) // fails, DATA[1] is not 0
fmt.Println(ok)
ok = td.Cmp(t, bytes.Buffer{}, td.Zero())
fmt.Println(ok)
ok = td.Cmp(t, &bytes.Buffer{}, td.Zero()) // fails, as pointer not nil
fmt.Println(ok)
ok = td.Cmp(t, &bytes.Buffer{}, td.Ptr(td.Zero())) // OK with the help of Ptr()
fmt.Println(ok)
// Output:
// true
// true
// false
// true
// false
// true
// false
// true
// false
// true
// false
// true
CmpZero shortcut
func CmpZero(t TestingT, got any, args ...any) bool
CmpZero is a shortcut for:
td.Cmp(t, got, td.Zero(), 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 CmpZero godoc.
Example
Base example
t := &testing.T{}
ok := td.CmpZero(t, 0)
fmt.Println(ok)
ok = td.CmpZero(t, float64(0))
fmt.Println(ok)
ok = td.CmpZero(t, 12) // fails, as 12 is not 0 :)
fmt.Println(ok)
ok = td.CmpZero(t, (map[string]int)(nil))
fmt.Println(ok)
ok = td.CmpZero(t, map[string]int{}) // fails, as not nil
fmt.Println(ok)
ok = td.CmpZero(t, ([]int)(nil))
fmt.Println(ok)
ok = td.CmpZero(t, []int{}) // fails, as not nil
fmt.Println(ok)
ok = td.CmpZero(t, [3]int{})
fmt.Println(ok)
ok = td.CmpZero(t, [3]int{0, 1}) // fails, DATA[1] is not 0
fmt.Println(ok)
ok = td.CmpZero(t, bytes.Buffer{})
fmt.Println(ok)
ok = td.CmpZero(t, &bytes.Buffer{}) // fails, as pointer not nil
fmt.Println(ok)
ok = td.Cmp(t, &bytes.Buffer{}, td.Ptr(td.Zero())) // OK with the help of Ptr()
fmt.Println(ok)
// Output:
// true
// true
// false
// true
// false
// true
// false
// true
// false
// true
// false
// true
T.Zero shortcut
func (t *T) Zero(got any, args ...any) bool
Zero is a shortcut for:
t.Cmp(got, td.Zero(), 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.Zero godoc.
Example
Base example
t := td.NewT(&testing.T{})
ok := t.Zero(0)
fmt.Println(ok)
ok = t.Zero(float64(0))
fmt.Println(ok)
ok = t.Zero(12) // fails, as 12 is not 0 :)
fmt.Println(ok)
ok = t.Zero((map[string]int)(nil))
fmt.Println(ok)
ok = t.Zero(map[string]int{}) // fails, as not nil
fmt.Println(ok)
ok = t.Zero(([]int)(nil))
fmt.Println(ok)
ok = t.Zero([]int{}) // fails, as not nil
fmt.Println(ok)
ok = t.Zero([3]int{})
fmt.Println(ok)
ok = t.Zero([3]int{0, 1}) // fails, DATA[1] is not 0
fmt.Println(ok)
ok = t.Zero(bytes.Buffer{})
fmt.Println(ok)
ok = t.Zero(&bytes.Buffer{}) // fails, as pointer not nil
fmt.Println(ok)
ok = t.Cmp(&bytes.Buffer{}, td.Ptr(td.Zero())) // OK with the help of Ptr()
fmt.Println(ok)
// Output:
// true
// true
// false
// true
// false
// true
// false
// true
// false
// true
// false
// true