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package flamegraph
import (
"encoding/json"
"os"
"testing"
)
type jsonNodeForTest struct {
Name string `json:"name"`
Value uint64 `json:"value"`
Total uint64 `json:"total"`
Children []jsonNodeForTest `json:"children"`
}
type jsonFlamegraphForTest struct {
Fields []string `json:"fields"`
CountField string `json:"countField"`
Root jsonNodeForTest `json:"root"`
}
func TestWriteJSONFromFileContainsFlamegraphTree(t *testing.T) {
dir := t.TempDir()
iorFile := writeTestIorZst(t, dir)
n := NewNativeSVG([]string{"comm", "path", "tracepoint"}, "count")
outFile, err := n.WriteJSONFromFile(iorFile)
if err != nil {
t.Fatalf("WriteJSONFromFile returned error: %v", err)
}
data, err := os.ReadFile(outFile)
if err != nil {
t.Fatalf("read output json: %v", err)
}
var payload jsonFlamegraphForTest
if err := json.Unmarshal(data, &payload); err != nil {
t.Fatalf("unmarshal output json: %v", err)
}
if payload.CountField != "count" {
t.Fatalf("count field = %q, want %q", payload.CountField, "count")
}
if len(payload.Fields) != 3 {
t.Fatalf("fields len = %d, want 3", len(payload.Fields))
}
if payload.Root.Name != "root" {
t.Fatalf("root name = %q, want %q", payload.Root.Name, "root")
}
if payload.Root.Total != 1 {
t.Fatalf("root total = %d, want 1", payload.Root.Total)
}
if len(payload.Root.Children) != 1 {
t.Fatalf("root children len = %d, want 1", len(payload.Root.Children))
}
if payload.Root.Children[0].Name != "tester" {
t.Fatalf("root child name = %q, want %q", payload.Root.Children[0].Name, "tester")
}
}
func TestWriteJSONFromFileCleansUpPartialOutputOnError(t *testing.T) {
dir := t.TempDir()
iorFile := writeTestIorZst(t, dir)
n := NewNativeSVG([]string{"invalidField"}, "count")
outFile, err := n.WriteJSONFromFile(iorFile)
if err == nil {
t.Fatal("expected error for invalid field, got nil")
}
if _, statErr := os.Stat(outFile); !os.IsNotExist(statErr) {
t.Fatalf("expected partial output to be removed, stat err=%v", statErr)
}
}
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