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set_test.go
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set_test.go
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package dag
import (
"fmt"
"testing"
)
func TestSetDifference(t *testing.T) {
cases := []struct {
Name string
A, B []interface{}
Expected []interface{}
}{
{
"same",
[]interface{}{1, 2, 3},
[]interface{}{3, 1, 2},
[]interface{}{},
},
{
"A has extra elements",
[]interface{}{1, 2, 3},
[]interface{}{3, 2},
[]interface{}{1},
},
{
"B has extra elements",
[]interface{}{1, 2, 3},
[]interface{}{3, 2, 1, 4},
[]interface{}{},
},
}
for i, tc := range cases {
t.Run(fmt.Sprintf("%d-%s", i, tc.Name), func(t *testing.T) {
one := make(Set)
two := make(Set)
expected := make(Set)
for _, v := range tc.A {
one.Add(v)
}
for _, v := range tc.B {
two.Add(v)
}
for _, v := range tc.Expected {
expected.Add(v)
}
actual := one.Difference(two)
match := actual.Intersection(expected)
if match.Len() != expected.Len() {
t.Fatalf("bad: %#v", actual.List())
}
})
}
}
func TestSetFilter(t *testing.T) {
cases := []struct {
Input []interface{}
Expected []interface{}
}{
{
[]interface{}{1, 2, 3},
[]interface{}{1, 2, 3},
},
{
[]interface{}{4, 5, 6},
[]interface{}{4},
},
{
[]interface{}{7, 8, 9},
[]interface{}{},
},
}
for i, tc := range cases {
t.Run(fmt.Sprintf("%d-%#v", i, tc.Input), func(t *testing.T) {
input := make(Set)
expected := make(Set)
for _, v := range tc.Input {
input.Add(v)
}
for _, v := range tc.Expected {
expected.Add(v)
}
actual := input.Filter(func(v interface{}) bool {
return v.(int) < 5
})
match := actual.Intersection(expected)
if match.Len() != expected.Len() {
t.Fatalf("bad: %#v", actual.List())
}
})
}
}
func TestSetCopy(t *testing.T) {
a := make(Set)
a.Add(1)
a.Add(2)
b := a.Copy()
b.Add(3)
diff := b.Difference(a)
if diff.Len() != 1 {
t.Fatalf("expected single diff value, got %#v", diff)
}
if !diff.Include(3) {
t.Fatalf("diff does not contain 3, got %#v", diff)
}
}