Calculate the moment when someone has lived for 10^9 seconds.
A gigasecond is 10^9 (1,000,000,000) seconds.
To run the tests run the command go test
from within the exercise directory.
If the test suite contains benchmarks, you can run these with the --bench
and --benchmem
flags:
go test -v --bench . --benchmem
Keep in mind that each reviewer will run benchmarks on a different machine, with different specs, so the results from these benchmark tests may vary.
For more detailed information about the Go track, including how to get help if you're having trouble, please visit the exercism.io Go language page.
Chapter 9 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=09
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
package gigasecond
// Source: exercism/problem-specifications
// Commit: 5506bac gigasecond: Apply new "input" policy
// Problem Specifications Version: 1.1.0
// Add one gigasecond to the input.
var addCases = []struct {
description string
in string
want string
}{
{
"date only specification of time",
"2011-04-25",
"2043-01-01T01:46:40",
},
{
"second test for date only specification of time",
"1977-06-13",
"2009-02-19T01:46:40",
},
{
"third test for date only specification of time",
"1959-07-19",
"1991-03-27T01:46:40",
},
{
"full time specified",
"2015-01-24T22:00:00",
"2046-10-02T23:46:40",
},
{
"full time with day roll-over",
"2015-01-24T23:59:59",
"2046-10-03T01:46:39",
},
}
package gigasecond
// Write a function AddGigasecond that works with time.Time.
import (
"os"
"testing"
"time"
)
// date formats used in test data
const (
fmtD = "2006-01-02"
fmtDT = "2006-01-02T15:04:05"
)
func TestAddGigasecond(t *testing.T) {
for _, tc := range addCases {
in := parse(tc.in, t)
want := parse(tc.want, t)
got := AddGigasecond(in)
if !got.Equal(want) {
t.Fatalf(`FAIL: %s
AddGigasecond(%s)
= %s
want %s`, tc.description, in, got, want)
}
t.Log("PASS:", tc.description)
}
t.Log("Tested", len(addCases), "cases.")
}
func parse(s string, t *testing.T) time.Time {
tt, err := time.Parse(fmtDT, s) // try full date time format first
if err != nil {
tt, err = time.Parse(fmtD, s) // also allow just date
}
if err != nil {
// can't run tests if input won't parse. if this seems to be a
// development or ci environment, raise an error. if this condition
// makes it to the solver though, ask for a bug report.
_, statErr := os.Stat("example_gen.go")
if statErr == nil || os.Getenv("TRAVIS_GO_VERSION") > "" {
t.Fatal(err)
} else {
t.Log(err)
t.Skip("(This is not your fault, and is unexpected. " +
"Please file an issue at https://github.com/exercism/go.)")
}
}
return tt
}
func BenchmarkAddGigasecond(b *testing.B) {
for i := 0; i < b.N; i++ {
AddGigasecond(time.Time{})
}
}
// Functions to calculate the moment when someone has lived for 10^9 seconds
package gigasecond
import "time"
// Given time.Time t, add 10^9 seconds and return the resulting date
func AddGigasecond(t time.Time) time.Time {
result := t.Add(time.Second * 1000000000)
return result
}
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