time_test.go

package main

import (
	"testing"
	"time"
)

func TestDefaultTimeToUnixNanoAndBackAgain(t *testing.T) {
	var defaultTime time.Time // 0001-01-01 00:00:00 +0000 UTC

	encodedDefaultTime := defaultTime.UnixNano() //gives -6795364578871345152

	decodedDefaultTime := time.Unix(0, encodedDefaultTime)

	if defaultTime != decodedDefaultTime {
		t.Errorf("expected: %v, got %v", defaultTime, decodedDefaultTime)
	}
}

func TestDefaultTimeToUnixAndBackAgain(t *testing.T) {
	var defaultTime time.Time // 0001-01-01 00:00:00 +0000 UTC

	encodedDefaultTime := defaultTime.Unix() //gives -62135596800

	decodedDefaultTime := time.Unix(encodedDefaultTime, 0)

	if defaultTime != decodedDefaultTime {
		t.Errorf("expected: %v, got %v", defaultTime, decodedDefaultTime)
	}
}

time_test_main.go

package main

import (
	"fmt"
	"time"
)

func TestDefaultTimeToUnixNanoAndBackAgain() {
	var defaultTime time.Time // 0001-01-01 00:00:00 +0000 UTC

	encodedDefaultTime := defaultTime.UnixNano() //gives -6795364578871345152

	decodedDefaultTime := time.Unix(0, encodedDefaultTime)

	if defaultTime != decodedDefaultTime {
		fmt.Printf("expected: %v, got %v\n", defaultTime, decodedDefaultTime)
	}
}

func TestDefaultTimeToUnixAndBackAgain() {
	var defaultTime time.Time // 0001-01-01 00:00:00 +0000 UTC

	encodedDefaultTime := defaultTime.Unix() //gives -62135596800

	decodedDefaultTime := time.Unix(encodedDefaultTime, 0)

	if defaultTime != decodedDefaultTime {
		fmt.Printf("expected: %v, got %v\n", defaultTime, decodedDefaultTime)
	}
}

func main() {

	TestDefaultTimeToUnixNanoAndBackAgain()
	TestDefaultTimeToUnixAndBackAgain()
}

time_test_output.go

--- FAIL: TestDefaultTimeToUnixNanoAndBackAgain (0.00s)
	time_test.go:17: expected: 0001-01-01 00:00:00 +0000 UTC, got 1754-08-30 22:43:41.128654848 +0000 GMT
--- FAIL: TestDefaultTimeToUnixAndBackAgain (0.00s)
	time_test.go:29: expected: 0001-01-01 00:00:00 +0000 UTC, got 0001-01-01 00:00:00 +0000 GMT
FAIL
FAIL	command-line-arguments	0.004s