Artifact [e3a32c8d74]

Artifact e3a32c8d746fd2d6f7f20c126eb70f320e8a4f6909640d8a69472cb07ab38042:

• File simio/rand_test.go — part of check-in [f5744359d3] at 2026-04-19 16:30:54 on branch trunk — Initial open source release

  libfossil is a pure-Go implementation of the Fossil SCM, reading and writing the same .fossil SQLite repository format as upstream Fossil.

  This is the first public release of code that previously lived in a private repository. The module path is github.com/danmestas/libfossil and the binary is named libfossil to avoid $PATH collisions with upstream fossil.

  Included: - Repo lifecycle (create, clone), checkout/checkin, timeline, merge, diff, annotate, shun, tag, branch, bisect, stash, undo/redo - Sync-over-HTTP protocol (client and handler) - Two SQLite drivers: modernc (pure Go, default) and ncruces (wasm-capable) - Observer interfaces (SyncObserver, CheckoutObserver) with an optional OpenTelemetry implementation in observer/otel (separate submodule) - Deterministic simulation testing harness with BUGGIFY fault injection - Kong-based embeddable CLI under cli/ and a standalone binary under cmd/libfossil/ (user: [email protected], size: 889) [annotate] [blame] [check-ins using]

package simio

import (
	"bytes"
	"testing"
)

func TestCryptoRandReads(t *testing.T) {
	r := CryptoRand{}
	buf := make([]byte, 32)
	n, err := r.Read(buf)
	if err != nil {
		t.Fatal(err)
	}
	if n != 32 {
		t.Fatalf("expected 32 bytes, got %d", n)
	}
	if bytes.Equal(buf, make([]byte, 32)) {
		t.Fatal("expected non-zero bytes")
	}
}

func TestSeededRandDeterministic(t *testing.T) {
	r1 := NewSeededRand(42)
	r2 := NewSeededRand(42)

	buf1 := make([]byte, 64)
	buf2 := make([]byte, 64)

	r1.Read(buf1)
	r2.Read(buf2)

	if !bytes.Equal(buf1, buf2) {
		t.Fatal("same seed should produce identical output")
	}
}

func TestSeededRandDifferentSeeds(t *testing.T) {
	r1 := NewSeededRand(1)
	r2 := NewSeededRand(2)

	buf1 := make([]byte, 64)
	buf2 := make([]byte, 64)

	r1.Read(buf1)
	r2.Read(buf2)

	if bytes.Equal(buf1, buf2) {
		t.Fatal("different seeds should produce different output")
	}
}