175 lines
3.8 KiB
Go
175 lines
3.8 KiB
Go
package graph
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import (
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"fmt"
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. "testing"
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"time"
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"github.com/mediocregopher/mediocre-go-lib/mrand"
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"github.com/mediocregopher/mediocre-go-lib/mtest/massert"
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"github.com/mediocregopher/mediocre-go-lib/mtest/mchk"
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)
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func strV(s string) Value {
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return Value{ID: s, V: s}
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}
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func TestGraph(t *T) {
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t.Parallel()
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type state struct {
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Graph
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m map[string]Edge
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}
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type params struct {
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add Edge
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del Edge
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}
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chk := mchk.Checker{
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Init: func() mchk.State {
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return state{
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m: map[string]Edge{},
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}
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},
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Next: func(ss mchk.State) mchk.Action {
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s := ss.(state)
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var p params
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if i := mrand.Intn(10); i == 0 {
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// add edge which is already there
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for _, e := range s.m {
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p.add = e
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break
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}
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} else if i == 1 {
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// delete edge which isn't there
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p.del = Edge{Tail: strV("z"), Head: strV("z")}
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} else if i <= 5 {
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// add probably new edge
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p.add = Edge{Tail: strV(mrand.Hex(1)), Head: strV(mrand.Hex(1))}
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} else {
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// probably del edge
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p.del = Edge{Tail: strV(mrand.Hex(1)), Head: strV(mrand.Hex(1))}
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}
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return mchk.Action{Params: p}
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},
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Apply: func(ss mchk.State, a mchk.Action) (mchk.State, error) {
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s, p := ss.(state), a.Params.(params)
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if p.add != (Edge{}) {
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s.Graph = s.Graph.AddEdge(p.add)
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s.m[p.add.id()] = p.add
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} else {
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s.Graph = s.Graph.DelEdge(p.del)
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delete(s.m, p.del.id())
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}
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{ // test Values and Edges methods
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vals := s.Graph.Values()
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edges := s.Graph.Edges()
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var aa []massert.Assertion
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found := map[string]bool{}
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tryAssert := func(v Value) {
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if ok := found[v.ID]; !ok {
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found[v.ID] = true
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aa = append(aa, massert.Has(vals, v))
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}
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}
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for _, e := range s.m {
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aa = append(aa, massert.Has(edges, e))
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tryAssert(e.Head)
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tryAssert(e.Tail)
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}
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aa = append(aa, massert.Len(vals, len(found)))
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aa = append(aa, massert.Len(edges, len(s.m)))
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if err := massert.All(aa...).Assert(); err != nil {
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return nil, err
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}
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}
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{ // test ValueEdges
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for _, val := range s.Graph.Values() {
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in, out := s.Graph.ValueEdges(val)
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var expIn, expOut []Edge
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for _, e := range s.m {
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if e.Tail.ID == val.ID {
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expOut = append(expOut, e)
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}
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if e.Head.ID == val.ID {
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expIn = append(expIn, e)
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}
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}
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if err := massert.Comment(massert.All(
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massert.Subset(expIn, in),
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massert.Len(in, len(expIn)),
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massert.Subset(expOut, out),
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massert.Len(out, len(expOut)),
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), "val:%q", val.V).Assert(); err != nil {
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return nil, err
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}
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}
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}
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return s, nil
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},
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}
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if err := chk.RunFor(5 * time.Second); err != nil {
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t.Fatal(err)
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}
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}
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func TestSubGraphAndEqual(t *T) {
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t.Parallel()
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type state struct {
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g1, g2 Graph
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expEqual, expSubGraph bool
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}
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type params struct {
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e Edge
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add1, add2 bool
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}
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chk := mchk.Checker{
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Init: func() mchk.State {
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return state{expEqual: true, expSubGraph: true}
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},
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Next: func(ss mchk.State) mchk.Action {
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i := mrand.Intn(10)
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p := params{
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e: Edge{Tail: strV(mrand.Hex(4)), Head: strV(mrand.Hex(4))},
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add1: i != 0,
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add2: i != 1,
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}
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return mchk.Action{Params: p}
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},
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Apply: func(ss mchk.State, a mchk.Action) (mchk.State, error) {
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s, p := ss.(state), a.Params.(params)
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if p.add1 {
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s.g1 = s.g1.AddEdge(p.e)
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}
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if p.add2 {
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s.g2 = s.g2.AddEdge(p.e)
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}
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s.expSubGraph = s.expSubGraph && p.add1
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s.expEqual = s.expEqual && p.add1 && p.add2
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if s.g1.SubGraph(s.g2) != s.expSubGraph {
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return nil, fmt.Errorf("SubGraph expected to return %v", s.expSubGraph)
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}
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if s.g1.Equal(s.g2) != s.expEqual {
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return nil, fmt.Errorf("Equal expected to return %v", s.expEqual)
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}
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return s, nil
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},
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MaxLength: 100,
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}
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if err := chk.RunFor(5 * time.Second); err != nil {
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t.Fatal(err)
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}
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}
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