larvit/fejkdata
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Test that the shipped data loads from a Go package per module, that a bare New fails naming WithDataFS, and that a read nothing provides names the modules its reader's manifest reads

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This commit is contained in:
Lilleman auf Larv
2026-10-10 13:08:01 +02:00
committed by Lillem4n
parent bf1becbb59
commit 3368f085fd
26 changed files with 471 additions and 188 deletions
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fejkdata_test.go
+9 -6
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@@ -7,10 +7,13 @@ import (
"testing"
"testing/fstest"
"github.com/larvit/fejkdata/data"
"github.com/larvit/fejkdata/internal/drawstate"
"github.com/larvit/fejkdata/internal/jsonvalue"
)
func withShipped() Option { return WithDataFS(data.Modules()...) }
// newGenerator creates a generator over a single data directory, failing on
// error. Most tests load one dir; newGeneratorN loads several (last-loaded wins
// on conflicts).
@@ -21,7 +24,7 @@ func newGenerator(t *testing.T, dir string, opts ...Option) *Generator {
func newGeneratorN(t *testing.T, dirs []string, opts ...Option) *Generator {
t.Helper()
all := []Option{WithoutShippedData()}
var all []Option
for _, dir := range dirs {
all = append(all, WithDataPath(dir))
}
@@ -43,14 +46,14 @@ func fake(t *testing.T, f *Generator, path string) string {
}
func TestNewMissingDirectory(t *testing.T) {
_, err := New(WithoutShippedData(), WithDataPath("data/de_DE"))
_, err := New(WithDataPath("data/de_DE"))
if err == nil || !strings.Contains(err.Error(), "de_DE") || !errors.Is(err, fs.ErrNotExist) {
t.Fatalf("New(missing) error = %v, want the real error, naming the path", err)
}
}
func TestNewRejectsAnEmptyDataPath(t *testing.T) {
_, err := New(WithoutShippedData(), WithDataPath(""))
_, err := New(WithDataPath(""))
if err == nil || !strings.Contains(err.Error(), "empty") {
t.Fatalf("New(WithDataPath(\"\")) = %v, want the empty path named", err)
}
@@ -60,14 +63,14 @@ func TestNewReportsAnEntropyFailure(t *testing.T) {
saved := randomBytes
randomBytes = func([]byte) (int, error) { return 0, errors.New("no entropy") }
defer func() { randomBytes = saved }()
_, err := New(WithoutShippedData(), WithDataFS(fstest.MapFS{"w.json": {Data: []byte(`"x"`)}}))
_, err := New(WithDataFS(fstest.MapFS{"w.json": {Data: []byte(`"x"`)}}))
if err == nil || !strings.Contains(err.Error(), "no entropy") {
t.Fatalf("New() without entropy = %v, want the failure reported", err)
}
}
func TestWithSeedIsDeterministic(t *testing.T) {
a, b := newGenerator(t, "data", WithSeed(42)), newGenerator(t, "data", WithSeed(42))
a, b := shipped(t, WithSeed(42)), shipped(t, WithSeed(42))
for i := 0; i < 50; i++ {
if x, y := fake(t, a, "sv_SE.person"), fake(t, b, "sv_SE.person"); x != y {
t.Fatalf("same seed diverged at %d: %q != %q", i, x, y)
@@ -76,7 +79,7 @@ func TestWithSeedIsDeterministic(t *testing.T) {
}
func TestDifferentSeedsDiffer(t *testing.T) {
a, b := newGenerator(t, "data", WithSeed(1)), newGenerator(t, "data", WithSeed(2))
a, b := shipped(t, WithSeed(1)), shipped(t, WithSeed(2))
for i := 0; i < 50; i++ {
if fake(t, a, "en_US.person") != fake(t, b, "en_US.person") {
return