Artifact [1985b98aeb]

Artifact 1985b98aeb0e055e3e081b5939606c217b7ab35c524b5620dc0a8300ba1d1bb6:

• File simio/buggify_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: 1259) [annotate] [blame] [check-ins using]

package simio

import "testing"

func TestBuggifyDisabledByDefault(t *testing.T) {
	// Should never fire when not enabled.
	for range 1000 {
		if Buggify(1.0) {
			t.Fatal("Buggify fired when not enabled")
		}
	}
}

func TestBuggifyEnabledFires(t *testing.T) {
	EnableBuggify(42)
	defer DisableBuggify()

	// With probability 1.0, should always fire.
	if !Buggify(1.0) {
		t.Fatal("Buggify(1.0) should always fire when enabled")
	}

	// With probability 0.0, should never fire.
	if Buggify(0.0) {
		t.Fatal("Buggify(0.0) should never fire")
	}
}

func TestBuggifyDeterministic(t *testing.T) {
	run := func(seed int64) int {
		EnableBuggify(seed)
		defer DisableBuggify()

		count := 0
		for range 1000 {
			if Buggify(0.5) {
				count++
			}
		}
		return count
	}

	c1 := run(99)
	c2 := run(99)
	if c1 != c2 {
		t.Fatalf("non-deterministic: %d vs %d", c1, c2)
	}

	// Different seed should produce different count (with high probability).
	c3 := run(7)
	if c1 == c3 {
		t.Logf("WARNING: different seeds produced same count %d (unlikely)", c1)
	}
}

func TestBuggifyDisableStops(t *testing.T) {
	EnableBuggify(1)
	if !Buggify(1.0) {
		t.Fatal("should fire when enabled")
	}

	DisableBuggify()
	if Buggify(1.0) {
		t.Fatal("should not fire after disable")
	}
}