Cannot see any mock sample data when generating tests

[dev2021-ctrl]

Everytime i generate test cases ,it gives me same skeleton code like below wihtout adding any actual testing values in the code.
May be I am missing something.
Can somebody please advise.A bit urgent
All test cases have comments " TODO: Add test cases." Does this package not support it ?

Sample test code generated with this package

func TestBit_Value(t *testing.T) {
tests := []struct {
name string
b Bit
want driver.Value
wantErr bool
}{
// TODO: Add test cases.
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.b.Value()
if (err != nil) != tt.wantErr {
t.Errorf("Bit.Value() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Bit.Value() = %v, want %v", got, tt.want)
}
})
}
}

[butuzov]

this tool generates only a skeleton for the test table, it's your responsibility to provide test cases. How can we define the initial value for b Bit or driver.Value?