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tarjan_test.go
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tarjan_test.go
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package dagg
import (
"sort"
"strings"
"testing"
)
func TestGraphStronglyConnected(t *testing.T) {
var g Graph[myint]
g.Add(myint(1))
g.Add(myint(2))
g.Connect(BasicEdge(myint(1), myint(2)))
g.Connect(BasicEdge(myint(2), myint(1)))
actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
expected := strings.TrimSpace(testGraphStronglyConnectedStr)
if actual != expected {
t.Fatalf("bad: %s", actual)
}
}
func TestGraphStronglyConnected_two(t *testing.T) {
var g Graph[myint]
g.Add(myint(1))
g.Add(myint(2))
g.Connect(BasicEdge(myint(1), myint(2)))
g.Connect(BasicEdge(myint(2), myint(1)))
g.Add(myint(3))
actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
expected := strings.TrimSpace(testGraphStronglyConnectedTwoStr)
if actual != expected {
t.Fatalf("bad: %s", actual)
}
}
func TestGraphStronglyConnected_three(t *testing.T) {
var g Graph[myint]
g.Add(myint(1))
g.Add(myint(2))
g.Connect(BasicEdge(myint(1), myint(2)))
g.Connect(BasicEdge(myint(2), myint(1)))
g.Add(myint(3))
g.Add(myint(4))
g.Add(myint(5))
g.Add(myint(6))
g.Connect(BasicEdge(myint(4), myint(5)))
g.Connect(BasicEdge(myint(5), myint(6)))
g.Connect(BasicEdge(myint(6), myint(4)))
actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
expected := strings.TrimSpace(testGraphStronglyConnectedThreeStr)
if actual != expected {
t.Fatalf("bad: %s", actual)
}
}
func testSCCStr[T Hashable](list [][]T) string {
var lines []string
for _, vs := range list {
result := make([]string, len(vs))
for i, v := range vs {
result[i] = VertexName(v)
}
sort.Strings(result)
lines = append(lines, strings.Join(result, ","))
}
sort.Strings(lines)
return strings.Join(lines, "\n")
}
const testGraphStronglyConnectedStr = `1,2`
const testGraphStronglyConnectedTwoStr = `
1,2
3
`
const testGraphStronglyConnectedThreeStr = `
1,2
3
4,5,6
`