Files
gonum/graph/internal/set/set_test.go
2017-07-02 08:38:42 +09:30

414 lines
8.3 KiB
Go

// Copyright ©2014 The gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package set
import "testing"
type node int64
func (n node) ID() int64 { return int64(n) }
// count reports the number of elements stored in the node set.
func (s Nodes) count() int {
return len(s)
}
// TestSame tests the assumption that pointer equality via unsafe conversion
// of a map[int]struct{} to uintptr is a valid test for perfect identity between
// set values. If any of the tests in TestSame fail, the package is broken and same
// must be reimplemented to conform to the runtime map implementation. The relevant
// code to look at (at least for gc) is in runtime/hashmap.{h,goc}.
func TestSame(t *testing.T) {
var (
a = make(Nodes)
b = make(Nodes)
c = a
)
if same(a, b) {
t.Error("Independently created sets test as same")
}
if !same(a, c) {
t.Error("Set copy and original test as not same.")
}
a.Add(node(1))
if !same(a, c) {
t.Error("Set copy and original test as not same after addition.")
}
if !same(nil, nil) {
t.Error("nil sets test as not same.")
}
if same(b, nil) {
t.Error("nil and empty sets test as same.")
}
}
func TestAdd(t *testing.T) {
s := make(Nodes)
if s == nil {
t.Fatal("Set cannot be created successfully")
}
if s.count() != 0 {
t.Error("Set somehow contains new elements upon creation")
}
s.Add(node(1))
s.Add(node(3))
s.Add(node(5))
if s.count() != 3 {
t.Error("Incorrect number of set elements after adding")
}
if !s.Has(node(1)) || !s.Has(node(3)) || !s.Has(node(5)) {
t.Error("Set doesn't contain element that was added")
}
s.Add(node(1))
if s.count() > 3 {
t.Error("Set double-adds element (element not unique)")
} else if s.count() < 3 {
t.Error("Set double-add lowered len")
}
if !s.Has(node(1)) {
t.Error("Set doesn't contain double-added element")
}
if !s.Has(node(3)) || !s.Has(node(5)) {
t.Error("Set removes element on double-add")
}
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key: %d != %d", e, n.ID())
}
}
}
func TestRemove(t *testing.T) {
s := make(Nodes)
s.Add(node(1))
s.Add(node(3))
s.Add(node(5))
s.Remove(node(1))
if s.count() != 2 {
t.Error("Incorrect number of set elements after removing an element")
}
if s.Has(node(1)) {
t.Error("Element present after removal")
}
if !s.Has(node(3)) || !s.Has(node(5)) {
t.Error("Set remove removed wrong element")
}
s.Remove(node(1))
if s.count() != 2 || s.Has(node(1)) {
t.Error("Double set remove does something strange")
}
s.Add(node(1))
if s.count() != 3 || !s.Has(node(1)) {
t.Error("Cannot add element after removal")
}
}
func TestClear(t *testing.T) {
s := make(Nodes)
s.Add(node(8))
s.Add(node(9))
s.Add(node(10))
s.clear()
if s.count() != 0 {
t.Error("clear did not properly reset set to size 0")
}
}
func TestSelfEqual(t *testing.T) {
s := make(Nodes)
if !Equal(s, s) {
t.Error("Set is not equal to itself")
}
s.Add(node(1))
if !Equal(s, s) {
t.Error("Set ceases self equality after adding element")
}
}
func TestEqual(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
if !Equal(a, b) {
t.Error("Two different empty sets not equal")
}
a.Add(node(1))
if Equal(a, b) {
t.Error("Two different sets with different elements not equal")
}
b.Add(node(1))
if !Equal(a, b) {
t.Error("Two sets with same element not equal")
}
}
func TestCopy(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
a.Add(node(1))
a.Add(node(2))
a.Add(node(3))
b.Copy(a)
if !Equal(a, b) {
t.Fatalf("Two sets not equal after copy")
}
b.Remove(node(1))
if Equal(a, b) {
t.Errorf("Mutating one set mutated another after copy")
}
}
func TestSelfCopy(t *testing.T) {
a := make(Nodes)
a.Add(node(1))
a.Add(node(2))
a.Copy(a)
if a.count() != 2 {
t.Error("Something strange happened when copying into self")
}
}
func TestUnionSame(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(1))
a.Add(node(2))
b.Add(node(1))
b.Add(node(2))
c.Union(a, b)
if c.count() != 2 {
t.Error("Union of same sets yields set with wrong len")
}
if !c.Has(node(1)) || !c.Has(node(2)) {
t.Error("Union of same sets yields wrong elements")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}
func TestUnionDiff(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(1))
a.Add(node(2))
b.Add(node(3))
c.Union(a, b)
if c.count() != 3 {
t.Error("Union of different sets yields set with wrong len")
}
if !c.Has(node(1)) || !c.Has(node(2)) || !c.Has(node(3)) {
t.Error("Union of different sets yields set with wrong elements")
}
if a.Has(node(3)) || !a.Has(node(2)) || !a.Has(node(1)) || a.count() != 2 {
t.Error("Union of sets mutates non-destination set (argument 1)")
}
if !b.Has(node(3)) || b.Has(node(1)) || b.Has(node(2)) || b.count() != 1 {
t.Error("Union of sets mutates non-destination set (argument 2)")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}
func TestUnionOverlapping(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(1))
a.Add(node(2))
b.Add(node(2))
b.Add(node(3))
c.Union(a, b)
if c.count() != 3 {
t.Error("Union of overlapping sets yields set with wrong len")
}
if !c.Has(node(1)) || !c.Has(node(2)) || !c.Has(node(3)) {
t.Error("Union of overlapping sets yields set with wrong elements")
}
if a.Has(node(3)) || !a.Has(node(2)) || !a.Has(node(1)) || a.count() != 2 {
t.Error("Union of sets mutates non-destination set (argument 1)")
}
if !b.Has(node(3)) || b.Has(node(1)) || !b.Has(node(2)) || b.count() != 2 {
t.Error("Union of sets mutates non-destination set (argument 2)")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}
func TestIntersectSame(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(2))
a.Add(node(3))
b.Add(node(2))
b.Add(node(3))
c.Intersect(a, b)
if card := c.count(); card != 2 {
t.Errorf("Intersection of identical sets yields set of wrong len %d", card)
}
if !c.Has(node(2)) || !c.Has(node(3)) {
t.Error("Intersection of identical sets yields set of wrong elements")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}
func TestIntersectDiff(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(2))
a.Add(node(3))
b.Add(node(1))
b.Add(node(4))
c.Intersect(a, b)
if card := c.count(); card != 0 {
t.Errorf("Intersection of different yields non-empty set %d", card)
}
if !a.Has(node(2)) || !a.Has(node(3)) || a.Has(node(1)) || a.Has(node(4)) || a.count() != 2 {
t.Error("Intersection of sets mutates non-destination set (argument 1)")
}
if b.Has(node(2)) || b.Has(node(3)) || !b.Has(node(1)) || !b.Has(node(4)) || b.count() != 2 {
t.Error("Intersection of sets mutates non-destination set (argument 1)")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}
func TestIntersectOverlapping(t *testing.T) {
a := make(Nodes)
b := make(Nodes)
c := make(Nodes)
a.Add(node(2))
a.Add(node(3))
b.Add(node(3))
b.Add(node(4))
c.Intersect(a, b)
if card := c.count(); card != 1 {
t.Errorf("Intersection of overlapping sets yields set of incorrect len %d", card)
}
if !c.Has(node(3)) {
t.Errorf("Intersection of overlapping sets yields set with wrong element")
}
if !a.Has(node(2)) || !a.Has(node(3)) || a.Has(node(4)) || a.count() != 2 {
t.Error("Intersection of sets mutates non-destination set (argument 1)")
}
if b.Has(node(2)) || !b.Has(node(3)) || !b.Has(node(4)) || b.count() != 2 {
t.Error("Intersection of sets mutates non-destination set (argument 1)")
}
for i, s := range []Nodes{a, b, c} {
for e, n := range s {
if e != n.ID() {
t.Errorf("Element ID did not match key in s%d: %d != %d", i+1, e, n.ID())
}
}
}
}