terraform/digraph/graphviz_test.go

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package digraph
import (
"bytes"
"strings"
"testing"
)
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func TestWriteDot(t *testing.T) {
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nodes := ParseBasic(`a -> b ; foo
a -> c
b -> d
b -> e
`)
var nlist []Node
for _, n := range nodes {
nlist = append(nlist, n)
}
buf := bytes.NewBuffer(nil)
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if err := WriteDot(buf, nlist); err != nil {
t.Fatalf("err: %s", err)
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}
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actual := strings.TrimSpace(string(buf.Bytes()))
expected := strings.TrimSpace(writeDotStr)
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actualLines := strings.Split(actual, "\n")
expectedLines := strings.Split(expected, "\n")
if actualLines[0] != expectedLines[0] ||
actualLines[len(actualLines)-1] != expectedLines[len(expectedLines)-1] ||
len(actualLines) != len(expectedLines) {
t.Fatalf("bad: %s", actual)
}
count := 0
for _, el := range expectedLines[1 : len(expectedLines)-1] {
for _, al := range actualLines[1 : len(actualLines)-1] {
if el == al {
count++
break
}
}
}
if count != len(expectedLines)-2 {
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t.Fatalf("bad: %s", actual)
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}
}
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const writeDotStr = `
digraph {
"a";
"a" -> "b" [label="foo"];
"a" -> "c" [label="Edge"];
"b";
"b" -> "d" [label="Edge"];
"b" -> "e" [label="Edge"];
"c";
"d";
"e";
}
`