404 lines
13 KiB
Go
404 lines
13 KiB
Go
package fejkdata
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import (
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"bytes"
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"encoding/json"
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"errors"
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"io/fs"
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"os"
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"path"
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"path/filepath"
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"reflect"
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"slices"
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"sort"
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"strings"
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"sync"
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"testing"
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"testing/fstest"
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"github.com/larvit/fejkdata/internal/datafiles"
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)
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var shippedManifestFile = path.Join("data", datafiles.ManifestFile)
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// withoutManifest is fsys with its manifest hidden, so it loads whole in New.
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type withoutManifest struct{ fs.FS }
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func (w withoutManifest) Open(name string) (fs.File, error) {
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if name == datafiles.ManifestFile {
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return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrNotExist}
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}
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return w.FS.Open(name)
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}
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// newShippedWhole loads every shipped category in New, as a source without an index does, so
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// a test reads the whole shipped tree.
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func newShippedWhole(t testing.TB, opts ...Option) *Generator {
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t.Helper()
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data, err := fs.Sub(shippedFS, "data")
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if err != nil {
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t.Fatal(err)
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}
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f, err := New(append([]Option{WithoutShippedData(), WithDataFS(withoutManifest{data})}, opts...)...)
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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return f
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}
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// loadedCategories is the dot path of every category f has parsed and resolved.
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func loadedCategories(f *Generator) []string {
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var out []string
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for _, s := range categorySites(&f.root) {
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out = append(out, s.path)
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}
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return out
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}
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// REGENERATE=1 rewrites the manifest.
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func TestShippedManifestIsCurrent(t *testing.T) {
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got, err := shippedManifest(newShippedWhole(t))
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if err != nil {
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t.Fatal(err)
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}
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if os.Getenv("REGENERATE") == "1" {
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if err := os.WriteFile(shippedManifestFile, got, 0o644); err != nil {
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t.Fatal(err)
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}
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return
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}
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want, err := os.ReadFile(shippedManifestFile)
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if err != nil {
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t.Fatal(err)
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}
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if string(got) != string(want) {
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t.Fatalf("%s is stale; regenerate it: docker compose run --rm --user \"$(id -u):$(id -g)\" generate", shippedManifestFile)
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}
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}
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// shippedManifest is the manifest of whole's tree, one category a line.
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func shippedManifest(whole *Generator) ([]byte, error) {
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var b bytes.Buffer
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b.WriteString("{\n\t\"index\": {")
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for i, s := range categorySites(&whole.root) {
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line, err := json.Marshal(indexEntry(s))
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if err != nil {
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return nil, err
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}
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if i > 0 {
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b.WriteString(",")
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}
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key, _ := json.Marshal(s.path)
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b.WriteString("\n\t\t" + string(key) + ": " + string(line))
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}
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b.WriteString("\n\t}\n}\n")
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return b.Bytes(), nil
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}
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func shippedIndex(t *testing.T) map[string]datafiles.IndexEntry {
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t.Helper()
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m, err := shippedSource.Manifest()
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if err != nil {
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t.Fatal(err)
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}
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return m.Index
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}
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func TestNewLoadsNoShippedCategory(t *testing.T) {
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f, err := New()
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if got := loadedCategories(f); len(got) > 0 {
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t.Fatalf("New() loaded %v", got)
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}
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}
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func TestReachingACategoryLoadsWhatItReads(t *testing.T) {
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for _, tc := range []struct {
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reach func(f *Generator) error
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want, absent []string
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}{
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{
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reach: func(f *Generator) error { _, err := f.Fake("sv_SE.person.first"); return err },
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want: []string{"sv_SE.first-name", "sv_SE.last-name", "sv_SE.person", "sv_SE.sex", "sv_SE.title"},
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},
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{
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reach: func(f *Generator) error { _, err := f.Fake("geo.SE.region"); return err },
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want: []string{"geo.SE.locality", "geo.SE.municipality", "geo.SE.postal-code", "geo.SE.region", "geo.SE.street"},
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absent: []string{"geo.SE.address", "geo.US.region"},
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},
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{
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reach: func(f *Generator) error { _, err := f.FakeTemplate("{/misc.territory[SE].name}"); return err },
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want: []string{"misc.territory", "misc.timezone"},
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absent: []string{"misc.tld"},
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},
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{
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reach: func(f *Generator) error { _, err := f.FakeRecord("misc.uuid"); return err },
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want: []string{"misc.uuid"},
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absent: []string{"misc.objectid"},
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},
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{
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reach: func(f *Generator) error {
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var v struct {
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Name string `fake:"sv_SE.first-name"`
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}
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return f.FakeStruct(&v)
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},
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want: []string{"sv_SE.first-name"},
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absent: []string{"sv_SE.person"},
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},
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} {
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f, err := New()
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if err := tc.reach(f); err != nil {
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t.Fatal(err)
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}
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got := loadedCategories(f)
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for _, w := range tc.want {
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if !slices.Contains(got, w) {
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t.Errorf("loaded %v, want %s among them", got, w)
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}
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}
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for _, a := range tc.absent {
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if slices.Contains(got, a) {
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t.Errorf("loaded %v, want %s left unloaded", got, a)
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}
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}
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}
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}
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func TestADataPathLoadsWhatItReads(t *testing.T) {
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f, err := New(WithDataPath(writeData(t, map[string]string{"greeting": `"Hej {/sv_SE.person}!"`})))
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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got := loadedCategories(f)
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for _, w := range []string{"greeting", "sv_SE.first-name", "sv_SE.person"} {
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if !slices.Contains(got, w) {
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t.Errorf("New loaded %v, want %s among them", got, w)
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}
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}
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for _, a := range []string{"misc.uuid", "sv_SE.address", "geo.SE.region"} {
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if slices.Contains(got, a) {
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t.Errorf("New loaded %v, want %s left unloaded", got, a)
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}
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}
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}
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func TestAReplacementBreakingAShippedReaderFailsItsFirstReach(t *testing.T) {
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for name, opt := range map[string]Option{
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"a data path": WithDataPath(writeData(t, map[string]string{"sv_SE/last-name": `"x"`})),
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"an indexed source": WithDataFS(fstest.MapFS{
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".fejkdata.json": {Data: []byte(`{"index": {"sv_SE.last-name": {"paths": [""]}}}`)},
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"sv_SE/last-name.json": {Data: []byte(`"x"`)},
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}),
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} {
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f, err := New(opt)
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if err != nil {
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t.Fatalf("New(%s) = %v", name, err)
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}
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if got := loadedCategories(f); slices.Contains(got, "sv_SE.person") {
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t.Errorf("New(%s) loaded %v, want sv_SE.person left for its first reach", name, got)
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}
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if _, err := f.Fake("sv_SE.person"); !errors.Is(err, ErrLoad) || !strings.Contains(err.Error(), "sv_SE.person") {
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t.Errorf(`%s: Fake("sv_SE.person") = %v, want ErrLoad naming sv_SE.person`, name, err)
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}
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}
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}
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func TestAnIndexedSourceStandsLikeTheShippedOne(t *testing.T) {
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fsys := fstest.MapFS{
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".fejkdata.json": {Data: []byte(`{"index": {"a": {"paths": [""]}, "b": {"paths": [""]}, "sub.c": {"paths": ["", "d"]}}}`)},
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"a.json": {Data: []byte(`"{/b}!"`)},
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"b.json": {Data: []byte(`"x"`)},
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"sub/c.json": {Data: []byte(`{"format":"{d}","d":"y"}`)},
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}
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f, err := New(WithoutShippedData(), WithDataFS(fsys), WithSeed(1))
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if got := loadedCategories(f); len(got) > 0 {
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t.Fatalf("New() loaded %v", got)
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}
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if got, want := f.List(), []string{"a", "b", "sub.c", "sub.c.d"}; !reflect.DeepEqual(got, want) {
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t.Fatalf("List() = %v, want %v", got, want)
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}
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if got := fake(t, f, "a"); got != "x!" {
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t.Fatalf(`Fake("a") = %q, want "x!"`, got)
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}
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if got, want := loadedCategories(f), []string{"a", "b"}; !reflect.DeepEqual(got, want) {
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t.Fatalf("loaded %v, want %v", got, want)
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}
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}
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func TestAnIndexedCategoryFailsAtFirstReachAndEveryReachAfter(t *testing.T) {
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f, err := New(WithoutShippedData(), WithDataFS(fstest.MapFS{
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".fejkdata.json": {Data: []byte(`{"index": {"bad": {"paths": [""]}, "good": {"paths": [""]}}}`)},
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"bad.json": {Data: []byte(`"{/nope}"`)},
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"good.json": {Data: []byte(`"fine"`)},
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}))
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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_, first := f.Fake("bad")
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if first == nil || !strings.Contains(first.Error(), "{/nope}") {
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t.Fatalf(`Fake("bad") = %v, want an error naming {/nope}`, first)
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}
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if !errors.Is(first, ErrLoad) {
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t.Fatalf(`Fake("bad") = %v, want it to wrap ErrLoad`, first)
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}
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if _, again := f.Fake("bad"); again == nil || again.Error() != first.Error() {
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t.Fatalf(`Fake("bad") again = %v, want %v`, again, first)
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}
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if got := fake(t, f, "good"); got != "fine" {
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t.Fatalf(`Fake("good") = %q`, got)
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}
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}
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func TestABrokenManifestFailsNewNamingEveryMistake(t *testing.T) {
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for manifest, want := range map[string][]string{
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`{`: {datafiles.ManifestFile},
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`{"index": {}} {}`: {"after top-level value"},
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`{"indx": {}, "INDEX": {}}`: {`unknown key "INDEX"`, `unknown key "indx"`},
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`{"index": []}`: {"index must be an object, not a list"},
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`{"index": {"a..b": 5}}`: {`"a..b"`, "must be an object, not a number"},
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`{"index": {"a": {"Paths": [""]}}}`: {`unknown key "Paths"`, "paths is missing"},
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`{"index": {"a": {}, "b": {}}}`: {`"a": paths is missing`, `"b": paths is missing`},
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`{"index": {"a": {"paths": ["x..y", 3]}}}`: {`"x..y"`, "paths item 2 must be a string, not a number"},
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`{"index": {"a": {"paths": [""], "parent": 5}}}`: {"parent must be a string, not a number"},
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`{"index": {"a": {"paths": [""], "parent": "b"}}}`: {`parent "b" names no entry`},
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`{"index": {"a": {"paths": [""], "reads": ["b"]}}}`: {`unknown key "reads"`},
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} {
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_, err := New(WithoutShippedData(), WithDataFS(fstest.MapFS{".fejkdata.json": {Data: []byte(manifest)}}))
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for _, w := range want {
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if err == nil || !strings.Contains(err.Error(), w) {
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t.Errorf("New(manifest %s) = %v, want an error naming %s", manifest, err, w)
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}
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}
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if err != nil && strings.Count(err.Error(), "\n") >= len(want) {
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t.Errorf("New(manifest %s) = %v, want %d mistakes, each once", manifest, err, len(want))
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}
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}
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}
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func TestNewMatchesErrLoadOnDataThatFailsToLoad(t *testing.T) {
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for name, opt := range map[string]Option{
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"a missing data path": WithDataPath(filepath.Join(t.TempDir(), "nope")),
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"a broken category": WithDataPath(writeData(t, map[string]string{"x": `{ not json`})),
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"a broken manifest": WithDataFS(fstest.MapFS{".fejkdata.json": {Data: []byte(`{`)}}),
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} {
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if _, err := New(opt); !errors.Is(err, ErrLoad) {
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t.Errorf("New(%s) = %v, want it to match ErrLoad", name, err)
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}
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}
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}
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func TestOnDemandRendersAsTheWholeLoad(t *testing.T) {
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whole := newShippedWhole(t)
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paths := whole.List()
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lazy, err := New()
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if got := lazy.List(); !reflect.DeepEqual(got, paths) {
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t.Fatalf("List() on demand = %v, want %v", got, paths)
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}
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a, err := New(WithSeed(7))
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if err != nil {
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t.Fatal(err)
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}
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b := newShippedWhole(t, WithSeed(7))
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for _, p := range paths {
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for range 3 {
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got, gotErr := a.Fake(p)
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want, wantErr := b.Fake(p)
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if got != want || (gotErr == nil) != (wantErr == nil) {
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t.Fatalf("Fake(%q) on demand = %q, %v; whole = %q, %v", p, got, gotErr, want, wantErr)
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}
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}
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}
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}
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func TestEveryShippedCategoryLoadsAlone(t *testing.T) {
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for _, p := range sortedNames(shippedIndex(t)) {
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f, err := New()
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if _, err := f.Fake(p); err != nil {
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t.Errorf("Fake(%q) on a fresh New() = %v", p, err)
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}
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}
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}
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func TestListRunsBesideAnOnDemandLoad(t *testing.T) {
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f, err := New()
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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var wg sync.WaitGroup
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for _, p := range []string{"sv_SE.person", "geo.US.address", "misc.territory"} {
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wg.Add(2)
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go func() {
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defer wg.Done()
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if _, err := f.Fake(p); err != nil {
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t.Error(err)
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}
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}()
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go func() {
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defer wg.Done()
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f.List()
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}()
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}
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wg.Wait()
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}
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func TestAParentColumnItsIndexEntryOmitsFailsTheFirstReachNamingTheManifest(t *testing.T) {
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f, err := New(WithoutShippedData(), WithDataFS(fstest.MapFS{
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".fejkdata.json": {Data: []byte(`{"index": {"city": {"paths": ["", "country", "name"]}, "country": {"paths": ["", "code", "name"]}}}`)},
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"country.json": {Data: []byte(`{"format":"{name}","rows":"country.tsv","key":"code"}`)},
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"country.tsv": {Data: []byte("code\tname\nSE\tSweden\n")},
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"city.json": {Data: []byte(`{"format":"{name}","rows":"city.tsv","key":"name","parent":"country"}`)},
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"city.tsv": {Data: []byte("name\tcountry\nOslo\tSE\n")},
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}))
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if _, err := f.Fake("country"); err != nil {
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t.Fatalf(`Fake("country") = %v`, err)
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}
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_, first := f.Fake("city")
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if first == nil || !strings.Contains(first.Error(), ".fejkdata.json") || !strings.Contains(first.Error(), `parent ""`) {
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t.Fatalf(`Fake("city") = %v, want the entry's parent named`, first)
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}
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if _, again := f.Fake("city"); again == nil || again.Error() != first.Error() {
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t.Fatalf(`Fake("city") again = %v, want %v`, again, first)
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}
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}
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func TestADataPathTableUnderAShippedTableLoads(t *testing.T) {
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f, err := New(WithSeed(1), WithDataPath(writeFiles(t, map[string]string{
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"sv_SE/nickname.json": `{"format":"{name}","rows":"nickname.tsv","key":"name","parent":"sex"}`,
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"sv_SE/nickname.tsv": "name\tsex\nKalle\tm\nLotta\tf\n",
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})))
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if err != nil {
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t.Fatalf("New() = %v", err)
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}
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if got := fake(t, f, "sv_SE.sex[m].nickname"); got != "Kalle" {
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t.Fatalf("sv_SE.sex[m].nickname = %q, want Kalle", got)
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}
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if got := fake(t, f, "sv_SE.person"); got == "" {
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t.Fatal("sv_SE.person rendered empty")
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}
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}
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// indexEntry is what an index says of the loaded category s.
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func indexEntry(s categorySite) datafiles.IndexEntry {
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e := datafiles.IndexEntry{Parent: parentOf(s.n), Paths: paths(s.n, false)}
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sort.Strings(e.Paths)
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return e
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}
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