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graphviz_test.go
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graphviz_test.go
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package graphviz_test
import (
"bytes"
"os"
"testing"
"github.com/denk0403/go-graphviz"
)
func TestGraphviz_Image(t *testing.T) {
g := graphviz.New()
graph, err := g.Graph()
if err != nil {
t.Fatalf("%+v", err)
}
defer func() {
graph.Close()
g.Close()
}()
n, err := graph.CreateNode("n")
if err != nil {
t.Fatalf("%+v", err)
}
m, err := graph.CreateNode("m")
if err != nil {
t.Fatalf("%+v", err)
}
e, err := graph.CreateEdge("e", n, m)
if err != nil {
t.Fatalf("%+v", err)
}
e.SetLabel("e")
t.Run("png", func(t *testing.T) {
t.Run("Render", func(t *testing.T) {
var buf bytes.Buffer
if err := g.Render(graph, graphviz.PNG, &buf); err != nil {
t.Fatalf("%+v", err)
}
if len(buf.Bytes()) != 4602 {
t.Fatalf("failed to encode png: bytes length is %d", len(buf.Bytes()))
}
})
t.Run("RenderImage", func(t *testing.T) {
image, err := g.RenderImage(graph)
if err != nil {
t.Fatalf("%+v", err)
}
bounds := image.Bounds()
if bounds.Max.X != 83 {
t.Fatal("failed to get image")
}
if bounds.Max.Y != 177 {
t.Fatal("failed to get image")
}
})
})
t.Run("jpg", func(t *testing.T) {
t.Run("Render", func(t *testing.T) {
var buf bytes.Buffer
if err := g.Render(graph, graphviz.JPG, &buf); err != nil {
t.Fatalf("%+v", err)
}
if len(buf.Bytes()) != 3296 {
t.Fatalf("failed to encode jpg: bytes length is %d", len(buf.Bytes()))
}
})
t.Run("RenderImage", func(t *testing.T) {
image, err := g.RenderImage(graph)
if err != nil {
t.Fatalf("%+v", err)
}
bounds := image.Bounds()
if bounds.Max.X != 83 {
t.Fatal("failed to get image")
}
if bounds.Max.Y != 177 {
t.Fatal("failed to get image")
}
})
})
}
func TestParseBytes(t *testing.T) {
type test struct {
input string
expected_valid bool
}
tests := []test{
{input: "graph test { a -- b }", expected_valid: true},
{input: "graph test { a -- b", expected_valid: false},
{input: "graph test { a -- b }", expected_valid: true},
{input: "graph test { a -- }", expected_valid: false},
{input: "graph test { a -- c }", expected_valid: true},
{input: "graph test { a - b }", expected_valid: false},
{input: "graph test { d -- e }", expected_valid: true},
}
for i, test := range tests {
_, err := graphviz.ParseBytes([]byte(test.input))
actual_valid := err == nil
if actual_valid != test.expected_valid {
t.Errorf("Test %d of TestParseBytes failed. Parsing error: %+v", i, err)
}
}
}
func TestParseFile(t *testing.T) {
type test struct {
input string
expected_valid bool
}
tests := []test{
{input: "graph test { a -- b }", expected_valid: true},
{input: "graph test { a -- b", expected_valid: false},
{input: "graph test { a -- b }", expected_valid: true},
{input: "graph test { a -- }", expected_valid: false},
{input: "graph test { a -- c }", expected_valid: true},
{input: "graph test { a - b }", expected_valid: false},
{input: "graph test { d -- e }", expected_valid: true},
}
createTempFile := func(t *testing.T, content string) *os.File {
file, err := os.CreateTemp("", "*")
if err != nil {
t.Fatalf("There was an error creating a temporary file. Error: %+v", err)
return nil
}
_, err = file.WriteString(content)
if err != nil {
t.Fatalf("There was an error writing '%s' to a temporary file. Error: %+v", content, err)
return nil
}
return file
}
for i, test := range tests {
tmpfile := createTempFile(t, test.input)
defer os.Remove(tmpfile.Name())
_, err := graphviz.ParseFile(tmpfile.Name())
actual_valid := err == nil
if actual_valid != test.expected_valid {
t.Errorf("Test %d of TestParseFile failed. Parsing error: %+v", i, err)
}
}
}
func TestGetNode(t *testing.T) {
g := graphviz.New()
graph, err := g.Graph()
if err != nil {
t.Fatalf("%+v", err)
}
defer func() {
graph.Close()
g.Close()
}()
_, err = graph.CreateNode("n")
if err != nil {
t.Fatalf("%+v", err)
}
n, err := graph.Node("n")
if err != nil {
t.Fatalf("%+v", err)
}
if n == nil {
t.Fatal("failed to get node 'n'. Got `nil` instead.")
}
if name := n.Name(); name != "n" {
t.Fatalf("failed to get node 'n'. Got node '%s' instead.", name)
}
m, err := graph.Node("m")
if err != nil {
t.Fatalf("%+v", err)
}
if m != nil {
t.Fatal("got unexpected node 'm'")
}
if nodes := graph.NumberNodes(); nodes != 1 {
t.Fatalf("expected graph to have 1 node, but found %d", nodes)
}
}
func TestGetEdge(t *testing.T) {
g := graphviz.New()
graph, err := g.Graph()
if err != nil {
t.Fatalf("%+v", err)
}
defer func() {
graph.Close()
g.Close()
}()
n, err := graph.CreateNode("n")
if err != nil {
t.Fatalf("%+v", err)
}
m, err := graph.CreateNode("m")
if err != nil {
t.Fatalf("%+v", err)
}
_, err = graph.CreateEdge("e1", n, m)
if err != nil {
t.Fatalf("%+v", err)
}
e1, err := graph.Edge("e1", n, m)
if err != nil {
t.Fatalf("%+v", err)
}
if e1 == nil {
t.Fatal("failed to get edge 'e1'. Got `nil` instead.")
}
if name := e1.Name(); name != "e1" {
t.Fatalf("failed to get node 'n'. Got node '%s' instead.", name)
}
e2, err := graph.Edge("e2", m, n)
if err != nil {
t.Fatalf("%+v", err)
}
if e2 != nil {
t.Fatal("got unexpected edge 'e2'")
}
if edges := graph.NumberEdges(); edges != 1 {
t.Fatalf("expected graph to have 1 edge, but found %d", edges)
}
}
func TestNodeDegree(t *testing.T) {
type test struct {
node_name string
expected_indegree int
expected_outdegree int
expected_total_degree int
}
type graphtest struct {
input string
tests []test
}
graphtests := []graphtest{
{input: "digraph test { a -> b }", tests: []test{
{node_name: "a", expected_indegree: 0, expected_outdegree: 1, expected_total_degree: 1},
{node_name: "b", expected_indegree: 1, expected_outdegree: 0, expected_total_degree: 1},
}},
{input: "digraph test { a -> b; a -> b; a -> a; c -> a }", tests: []test{
{node_name: "a", expected_indegree: 2, expected_outdegree: 3, expected_total_degree: 5},
{node_name: "b", expected_indegree: 2, expected_outdegree: 0, expected_total_degree: 2},
{node_name: "c", expected_indegree: 0, expected_outdegree: 1, expected_total_degree: 1},
}},
{input: "graph test { a -- b; a -- b; a -- a; c -- a }", tests: []test{
{node_name: "a", expected_indegree: 2, expected_outdegree: 3, expected_total_degree: 5},
{node_name: "b", expected_indegree: 2, expected_outdegree: 0, expected_total_degree: 2},
{node_name: "c", expected_indegree: 0, expected_outdegree: 1, expected_total_degree: 1},
}},
{input: "strict graph test { a -- b; b -- a; a -- a; c -- a }", tests: []test{
{node_name: "a", expected_indegree: 2, expected_outdegree: 2, expected_total_degree: 4},
{node_name: "b", expected_indegree: 1, expected_outdegree: 0, expected_total_degree: 1},
{node_name: "c", expected_indegree: 0, expected_outdegree: 1, expected_total_degree: 1},
}},
}
for _, graphtest := range graphtests {
input := graphtest.input
graph, err := graphviz.ParseBytes([]byte(input))
if err != nil {
t.Fatalf("Input: %s. Error: %+v", input, err)
}
for _, test := range graphtest.tests {
node_name := test.node_name
node, err := graph.Node(node_name)
if err != nil || node == nil {
t.Fatalf("Unable to retrieve node '%s'. Input: %s. Error: %+v", node_name, input, err)
}
indegree := graph.Indegree(node)
if test.expected_indegree != indegree {
t.Errorf("Unexpected indegree for node '%s'. Input: %s. Expected: %d. Actual: %d.", node_name, input, test.expected_indegree, indegree)
}
outdegree := graph.Outdegree(node)
if test.expected_outdegree != outdegree {
t.Errorf("Unexpected outdegree for node '%s'. Input: %s. Expected: %d. Actual: %d.", node_name, input, test.expected_outdegree, outdegree)
}
total_degree := graph.TotalDegree(node)
if test.expected_total_degree != total_degree {
t.Errorf("Unexpected total degree for node '%s'. Input: %s. Expected: %d. Actual: %d.", node_name, input, test.expected_total_degree, total_degree)
}
}
}
}