Fix TestWriteDot random order error

digraph/graphviz_test.go

@@ -24,7 +24,27 @@ b -> e
 
 	actual := strings.TrimSpace(string(buf.Bytes()))
 	expected := strings.TrimSpace(writeDotStr)
-	if actual != expected {
+
+	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 {
 		t.Fatalf("bad: %s", actual)
 	}
 }