86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
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package dag
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import (
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"bytes"
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"fmt"
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"strings"
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"testing"
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)
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func TestGraphStronglyConnected(t *testing.T) {
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var g Graph
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g.Add(1)
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g.Add(2)
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g.Connect(BasicEdge(1, 2))
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g.Connect(BasicEdge(2, 1))
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actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
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expected := strings.TrimSpace(testGraphStronglyConnectedStr)
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if actual != expected {
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t.Fatalf("bad: %s", actual)
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}
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}
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func TestGraphStronglyConnected_two(t *testing.T) {
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var g Graph
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g.Add(1)
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g.Add(2)
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g.Connect(BasicEdge(1, 2))
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g.Connect(BasicEdge(2, 1))
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g.Add(3)
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actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
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expected := strings.TrimSpace(testGraphStronglyConnectedTwoStr)
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if actual != expected {
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t.Fatalf("bad: %s", actual)
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}
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}
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func TestGraphStronglyConnected_three(t *testing.T) {
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var g Graph
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g.Add(1)
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g.Add(2)
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g.Connect(BasicEdge(1, 2))
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g.Connect(BasicEdge(2, 1))
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g.Add(3)
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g.Add(4)
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g.Add(5)
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g.Add(6)
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g.Connect(BasicEdge(4, 5))
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g.Connect(BasicEdge(5, 6))
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g.Connect(BasicEdge(6, 4))
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actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
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expected := strings.TrimSpace(testGraphStronglyConnectedThreeStr)
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if actual != expected {
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t.Fatalf("bad: %s", actual)
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}
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}
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func testSCCStr(list [][]Vertex) string {
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var buf bytes.Buffer
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for _, vs := range list {
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result := make([]string, len(vs))
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for i, v := range vs {
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result[i] = vertName(v)
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}
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buf.WriteString(fmt.Sprintf("%s\n", strings.Join(result, ",")))
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}
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return buf.String()
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}
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const testGraphStronglyConnectedStr = `2,1`
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const testGraphStronglyConnectedTwoStr = `
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2,1
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3
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`
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const testGraphStronglyConnectedThreeStr = `
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2,1
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3
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6,5,4
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`
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