Rename the project to fejkdata and record the fork source

fejkdata_test.go

@@ -0,0 +1,58 @@
+package fejkdata
+
+import (
+	"strings"
+	"testing"
+)
+
+// newFejkdata creates a faker over a single data directory, failing on error. Most
+// tests load one dir; newFejkdataN loads several (last-loaded wins on conflicts).
+func newFejkdata(t *testing.T, dir string, opts ...Option) *Fejkdata {
+	t.Helper()
+	return newFejkdataN(t, []string{dir}, opts...)
+}
+
+func newFejkdataN(t *testing.T, dirs []string, opts ...Option) *Fejkdata {
+	t.Helper()
+	f, err := New(dirs, opts...)
+	if err != nil {
+		t.Fatalf("New(%q): %v", dirs, err)
+	}
+	return f
+}
+
+// fake generates a value, failing the test on error.
+func fake(t *testing.T, f *Fejkdata, path string) string {
+	t.Helper()
+	s, err := f.Fake(path)
+	if err != nil {
+		t.Fatalf("Fake(%q): %v", path, err)
+	}
+	return s
+}
+
+func TestNewMissingDirectory(t *testing.T) {
+	_, err := New([]string{"data/de_DE"})
+	if err == nil || !strings.Contains(err.Error(), "de_DE") {
+		t.Fatalf("New(missing) error = %v, want it to name the path", err)
+	}
+}
+
+func TestWithSeedIsDeterministic(t *testing.T) {
+	a, b := newFejkdata(t, "data/sv_SE", WithSeed(42)), newFejkdata(t, "data/sv_SE", WithSeed(42))
+	for i := 0; i < 50; i++ {
+		if x, y := fake(t, a, "person"), fake(t, b, "person"); x != y {
+			t.Fatalf("same seed diverged at %d: %q != %q", i, x, y)
+		}
+	}
+}
+
+func TestDifferentSeedsDiffer(t *testing.T) {
+	a, b := newFejkdata(t, "data/en_US", WithSeed(1)), newFejkdata(t, "data/en_US", WithSeed(2))
+	for i := 0; i < 50; i++ {
+		if fake(t, a, "person") != fake(t, b, "person") {
+			return
+		}
+	}
+	t.Fatal("seeds 1 and 2 produced identical sequences")
+}