Artifact [c6627e4225]

Artifact c6627e422538bdd49b39d2f608e9d3a83536fb102046394f013a4ab86a1a78dc:

• File simio/env_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: 1275) [annotate] [blame] [check-ins using]

package simio

import (
	"testing"
)

func TestRealEnv(t *testing.T) {
	env := RealEnv()
	if env.Clock == nil {
		t.Fatal("Clock should not be nil")
	}
	if env.Rand == nil {
		t.Fatal("Rand should not be nil")
	}

	// RealClock.Now should return a reasonable time
	now := env.Clock.Now()
	if now.Year() < 2024 {
		t.Fatalf("RealClock.Now returned suspicious time: %v", now)
	}

	// CryptoRand should read bytes
	buf := make([]byte, 16)
	n, err := env.Rand.Read(buf)
	if err != nil {
		t.Fatal(err)
	}
	if n != 16 {
		t.Fatalf("expected 16 bytes, got %d", n)
	}
}

func TestSimEnv(t *testing.T) {
	env := SimEnv(99)
	if env.Clock == nil {
		t.Fatal("Clock should not be nil")
	}
	if env.Rand == nil {
		t.Fatal("Rand should not be nil")
	}

	// SimClock should be a *SimClock
	sc, ok := env.Clock.(*SimClock)
	if !ok {
		t.Fatalf("expected *SimClock, got %T", env.Clock)
	}
	if !sc.Now().IsZero() && sc.Now().Unix() != 0 {
		t.Fatalf("SimClock should start at epoch, got %v", sc.Now())
	}

	// SeededRand should be deterministic
	env2 := SimEnv(99)
	buf1 := make([]byte, 32)
	buf2 := make([]byte, 32)
	env.Rand.Read(buf1)
	env2.Rand.Read(buf2)

	for i := range buf1 {
		if buf1[i] != buf2[i] {
			t.Fatal("SimEnv with same seed should produce identical Rand output")
		}
	}
}