package main

import (
	"os"
	"testing"
)

// spec:26174-planctl-context-tokens/R1.2+D§3.3
func TestPpidOf_selfParent(t *testing.T) {
	got := ppidOf(os.Getpid())
	want := os.Getppid()
	if got != want {
		t.Errorf("ppidOf(getpid()) = %d, want getppid()=%d", got, want)
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
func TestProcessAlive_self(t *testing.T) {
	if !processAlive(os.Getpid()) {
		t.Error("processAlive(self) returned false")
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
func TestProcessAlive_zeroOrNegative(t *testing.T) {
	if processAlive(0) {
		t.Error("processAlive(0) should be false")
	}
	if processAlive(-1) {
		t.Error("processAlive(-1) should be false")
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3+D§4.1
func TestProcessStartTimeSec_selfNonZero(t *testing.T) {
	stamp, err := processStartTimeSec(os.Getpid())
	if err != nil {
		t.Fatalf("processStartTimeSec(self): %v", err)
	}
	if stamp <= 0 {
		t.Errorf("expected positive stamp, got %d", stamp)
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
// ppidOf of a very unlikely PID (huge number) should return 0 (not panic).
func TestPpidOf_nonexistent(t *testing.T) {
	got := ppidOf(999_999_999)
	if got != 0 {
		t.Errorf("ppidOf(nonexistent) = %d, want 0", got)
	}
}