terraform/dag/tarjan_test.go

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