package evidence

import "testing"

func TestForegroundTrackerChanged(t *testing.T) {
	var tr foregroundTracker

	if !tr.changed(true, 100, "A") {
		t.Fatal("first observation should always report changed")
	}
	if tr.changed(true, 100, "A") {
		t.Error("identical observation should not report changed")
	}
	if !tr.changed(true, 100, "B") {
		t.Error("title change on same hwnd should report changed")
	}
	if !tr.changed(true, 200, "B") {
		t.Error("hwnd change should report changed")
	}
	if !tr.changed(false, 0, "") {
		t.Error("transition to unavailable should report changed")
	}
	if tr.changed(false, 0, "") {
		t.Error("repeated unavailable should not report changed")
	}
	if !tr.changed(true, 200, "B") {
		t.Error("transition back to available should report changed")
	}
}