311 lines
7.9 KiB
Go
311 lines
7.9 KiB
Go
package gg
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import (
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"fmt"
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"hash"
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. "testing"
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"github.com/stretchr/testify/assert"
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)
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type idAny struct {
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i interface{}
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}
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func (i idAny) Identify(h hash.Hash) {
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fmt.Fprintln(h, i)
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}
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func id(i interface{}) Identifier {
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return idAny{i: i}
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}
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func edge(val string, from *Vertex) Edge {
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return Edge{Value: id(val), From: from}
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}
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func value(val string, in ...Edge) *Vertex {
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return &Vertex{
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VertexType: Value,
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Value: id(val),
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In: in,
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}
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}
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func junction(val string, in ...Edge) Edge {
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return Edge{
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From: &Vertex{
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VertexType: Junction,
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In: in,
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},
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Value: id(val),
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}
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}
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func assertVertexEqual(t *T, exp, got *Vertex, msgAndArgs ...interface{}) bool {
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var assertInner func(*Vertex, *Vertex, map[*Vertex]bool) bool
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assertInner = func(exp, got *Vertex, m map[*Vertex]bool) bool {
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// if got is already in m then we've already looked at it
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if m[got] {
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return true
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}
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m[got] = true
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assert.Equal(t, exp.VertexType, got.VertexType, msgAndArgs...)
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assert.Equal(t, exp.Value, got.Value, msgAndArgs...)
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if !assert.Len(t, got.In, len(exp.In), msgAndArgs...) {
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return false
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}
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for i := range exp.In {
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assertInner(exp.In[i].From, got.In[i].From, m)
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assert.Equal(t, exp.In[i].Value, got.In[i].Value, msgAndArgs...)
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assert.Equal(t, got, got.In[i].To)
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assert.Contains(t, got.In[i].From.Out, got.In[i])
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}
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return true
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}
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return assertInner(exp, got, map[*Vertex]bool{})
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}
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type graphTest struct {
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name string
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out func() *Graph
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exp []*Vertex
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}
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func mkTest(name string, out func() *Graph, exp ...*Vertex) graphTest {
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return graphTest{name: name, out: out, exp: exp}
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}
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func TestGraph(t *T) {
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tests := []graphTest{
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mkTest(
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"values-basic",
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func() *Graph {
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return Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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},
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value("v0"),
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value("v1", edge("e0", value("v0"))),
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),
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mkTest(
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"values-2edges",
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func() *Graph {
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g0 := Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v2"))
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return g0.ValueIn(ValueOut(id("v1"), id("e1")), id("v2"))
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},
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value("v0"),
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value("v1"),
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value("v2",
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edge("e0", value("v0")),
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edge("e1", value("v1")),
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),
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),
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mkTest(
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"values-separate",
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func() *Graph {
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g0 := Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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return g0.ValueIn(ValueOut(id("v2"), id("e2")), id("v3"))
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},
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value("v0"),
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value("v1", edge("e0", value("v0"))),
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value("v2"),
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value("v3", edge("e2", value("v2"))),
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),
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mkTest(
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"values-circular",
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func() *Graph {
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return Null.ValueIn(ValueOut(id("v0"), id("e")), id("v0"))
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},
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value("v0", edge("e", value("v0"))),
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),
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mkTest(
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"values-circular2",
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func() *Graph {
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g0 := Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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return g0.ValueIn(ValueOut(id("v1"), id("e1")), id("v0"))
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},
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value("v0", edge("e1", value("v1", edge("e0", value("v0"))))),
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value("v1", edge("e0", value("v0", edge("e1", value("v1"))))),
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),
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mkTest(
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"values-circular3",
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func() *Graph {
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g0 := Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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g1 := g0.ValueIn(ValueOut(id("v1"), id("e1")), id("v2"))
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return g1.ValueIn(ValueOut(id("v2"), id("e2")), id("v1"))
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},
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value("v0"),
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value("v1",
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edge("e0", value("v0")),
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edge("e2", value("v2", edge("e1", value("v1")))),
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),
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value("v2", edge("e1", value("v1",
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edge("e0", value("v0")),
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edge("e2", value("v2")),
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))),
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),
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mkTest(
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"junction-basic",
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func() *Graph {
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e0 := ValueOut(id("v0"), id("e0"))
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e1 := ValueOut(id("v1"), id("e1"))
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ej0 := JunctionOut([]HalfEdge{e0, e1}, id("ej0"))
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return Null.ValueIn(ej0, id("v2"))
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},
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value("v0"), value("v1"),
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value("v2", junction("ej0",
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edge("e0", value("v0")),
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edge("e1", value("v1")),
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)),
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),
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mkTest(
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"junction-basic2",
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func() *Graph {
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e00 := ValueOut(id("v0"), id("e00"))
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e10 := ValueOut(id("v1"), id("e10"))
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ej0 := JunctionOut([]HalfEdge{e00, e10}, id("ej0"))
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e01 := ValueOut(id("v0"), id("e01"))
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e11 := ValueOut(id("v1"), id("e11"))
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ej1 := JunctionOut([]HalfEdge{e01, e11}, id("ej1"))
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ej2 := JunctionOut([]HalfEdge{ej0, ej1}, id("ej2"))
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return Null.ValueIn(ej2, id("v2"))
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},
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value("v0"), value("v1"),
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value("v2", junction("ej2",
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junction("ej0",
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edge("e00", value("v0")),
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edge("e10", value("v1")),
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),
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junction("ej1",
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edge("e01", value("v0")),
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edge("e11", value("v1")),
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),
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)),
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),
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mkTest(
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"junction-circular",
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func() *Graph {
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e0 := ValueOut(id("v0"), id("e0"))
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e1 := ValueOut(id("v1"), id("e1"))
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ej0 := JunctionOut([]HalfEdge{e0, e1}, id("ej0"))
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g0 := Null.ValueIn(ej0, id("v2"))
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e20 := ValueOut(id("v2"), id("e20"))
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g1 := g0.ValueIn(e20, id("v0"))
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e21 := ValueOut(id("v2"), id("e21"))
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return g1.ValueIn(e21, id("v1"))
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},
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value("v0", edge("e20", value("v2", junction("ej0",
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edge("e0", value("v0")),
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edge("e1", value("v1", edge("e21", value("v2")))),
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)))),
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value("v1", edge("e21", value("v2", junction("ej0",
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edge("e0", value("v0", edge("e20", value("v2")))),
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edge("e1", value("v1")),
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)))),
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value("v2", junction("ej0",
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edge("e0", value("v0", edge("e20", value("v2")))),
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edge("e1", value("v1", edge("e21", value("v2")))),
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)),
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),
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}
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for i := range tests {
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out := tests[i].out()
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for j, exp := range tests[i].exp {
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msgAndArgs := []interface{}{
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"tests[%d].name:%q exp[%d].val:%q",
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i, tests[i].name, j, exp.Value.(idAny).i,
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}
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v := out.Value(exp.Value)
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if !assert.NotNil(t, v, msgAndArgs...) {
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continue
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}
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assertVertexEqual(t, exp, v, msgAndArgs...)
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}
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// sanity check that graphs are equal to themselves
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assert.True(t, Equal(out, out))
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}
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}
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func TestGraphImmutability(t *T) {
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e0 := ValueOut(id("v0"), id("e0"))
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g0 := Null.ValueIn(e0, id("v1"))
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assert.Nil(t, Null.Value(id("v0")))
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assert.Nil(t, Null.Value(id("v1")))
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assert.NotNil(t, g0.Value(id("v0")))
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assert.NotNil(t, g0.Value(id("v1")))
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// half-edges should be re-usable
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e1 := ValueOut(id("v2"), id("e1"))
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g1a := g0.ValueIn(e1, id("v3a"))
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g1b := g0.ValueIn(e1, id("v3b"))
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assertVertexEqual(t, value("v3a", edge("e1", value("v2"))), g1a.Value(id("v3a")))
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assert.Nil(t, g1a.Value(id("v3b")))
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assertVertexEqual(t, value("v3b", edge("e1", value("v2"))), g1b.Value(id("v3b")))
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assert.Nil(t, g1b.Value(id("v3a")))
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// ... even re-usable twice in succession
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g2 := g0.ValueIn(e1, id("v3")).ValueIn(e1, id("v4"))
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assert.Nil(t, g2.Value(id("v3b")))
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assert.Nil(t, g2.Value(id("v3a")))
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assertVertexEqual(t, value("v3", edge("e1", value("v2"))), g2.Value(id("v3")))
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assertVertexEqual(t, value("v4", edge("e1", value("v2"))), g2.Value(id("v4")))
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}
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func TestGraphEqual(t *T) {
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assertEqual := func(g1, g2 *Graph) {
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assert.True(t, Equal(g1, g2))
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assert.True(t, Equal(g2, g1))
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}
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assertNotEqual := func(g1, g2 *Graph) {
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assert.False(t, Equal(g1, g2))
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assert.False(t, Equal(g2, g1))
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}
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assertEqual(Null, Null) // duh
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{
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// graph is equal to itself, not to null
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e0 := ValueOut(id("v0"), id("e0"))
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g0 := Null.ValueIn(e0, id("v1"))
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assertNotEqual(g0, Null)
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assertEqual(g0, g0)
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// adding the an existing edge again shouldn't do anything
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assertEqual(g0, g0.ValueIn(e0, id("v1")))
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// g1a and g1b have the same vertices, but the edges are different
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g1a := g0.ValueIn(ValueOut(id("v0"), id("e1a")), id("v2"))
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g1b := g0.ValueIn(ValueOut(id("v0"), id("e1b")), id("v2"))
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assertNotEqual(g1a, g1b)
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}
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{ // equal construction should yield equality, even if out of order
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ga := Null.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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ga = ga.ValueIn(ValueOut(id("v1"), id("e1")), id("v2"))
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gb := Null.ValueIn(ValueOut(id("v1"), id("e1")), id("v2"))
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gb = gb.ValueIn(ValueOut(id("v0"), id("e0")), id("v1"))
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assertEqual(ga, gb)
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}
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{ // junction basic test
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e0 := ValueOut(id("v0"), id("e0"))
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e1 := ValueOut(id("v1"), id("e1"))
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ga := Null.ValueIn(JunctionOut([]HalfEdge{e0, e1}, id("ej")), id("v2"))
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gb := Null.ValueIn(JunctionOut([]HalfEdge{e1, e0}, id("ej")), id("v2"))
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assertEqual(ga, ga)
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assertNotEqual(ga, gb)
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}
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}
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