github.com/heimweh/terraform@v0.7.4/dag/tarjan_test.go (about)

     1  package dag
     2  
     3  import (
     4  	"sort"
     5  	"strings"
     6  	"testing"
     7  )
     8  
     9  func TestGraphStronglyConnected(t *testing.T) {
    10  	var g Graph
    11  	g.Add(1)
    12  	g.Add(2)
    13  	g.Connect(BasicEdge(1, 2))
    14  	g.Connect(BasicEdge(2, 1))
    15  
    16  	actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
    17  	expected := strings.TrimSpace(testGraphStronglyConnectedStr)
    18  	if actual != expected {
    19  		t.Fatalf("bad: %s", actual)
    20  	}
    21  }
    22  
    23  func TestGraphStronglyConnected_two(t *testing.T) {
    24  	var g Graph
    25  	g.Add(1)
    26  	g.Add(2)
    27  	g.Connect(BasicEdge(1, 2))
    28  	g.Connect(BasicEdge(2, 1))
    29  	g.Add(3)
    30  
    31  	actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
    32  	expected := strings.TrimSpace(testGraphStronglyConnectedTwoStr)
    33  	if actual != expected {
    34  		t.Fatalf("bad: %s", actual)
    35  	}
    36  }
    37  
    38  func TestGraphStronglyConnected_three(t *testing.T) {
    39  	var g Graph
    40  	g.Add(1)
    41  	g.Add(2)
    42  	g.Connect(BasicEdge(1, 2))
    43  	g.Connect(BasicEdge(2, 1))
    44  	g.Add(3)
    45  	g.Add(4)
    46  	g.Add(5)
    47  	g.Add(6)
    48  	g.Connect(BasicEdge(4, 5))
    49  	g.Connect(BasicEdge(5, 6))
    50  	g.Connect(BasicEdge(6, 4))
    51  
    52  	actual := strings.TrimSpace(testSCCStr(StronglyConnected(&g)))
    53  	expected := strings.TrimSpace(testGraphStronglyConnectedThreeStr)
    54  	if actual != expected {
    55  		t.Fatalf("bad: %s", actual)
    56  	}
    57  }
    58  
    59  func testSCCStr(list [][]Vertex) string {
    60  	var lines []string
    61  	for _, vs := range list {
    62  		result := make([]string, len(vs))
    63  		for i, v := range vs {
    64  			result[i] = VertexName(v)
    65  		}
    66  
    67  		sort.Strings(result)
    68  		lines = append(lines, strings.Join(result, ","))
    69  	}
    70  
    71  	sort.Strings(lines)
    72  	return strings.Join(lines, "\n")
    73  }
    74  
    75  const testGraphStronglyConnectedStr = `1,2`
    76  
    77  const testGraphStronglyConnectedTwoStr = `
    78  1,2
    79  3
    80  `
    81  
    82  const testGraphStronglyConnectedThreeStr = `
    83  1,2
    84  3
    85  4,5,6
    86  `