add tests

dependency/vault_pki_test.go

@@ -7,10 +7,14 @@ package dependency
 
 import (
 	"bytes"
+	"crypto/x509"
+	"crypto/x509/pkix"
 	"errors"
+	"fmt"
 	"os"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/hashicorp/consul-template/renderer"
 	"github.com/hashicorp/vault/api"
@@ -53,6 +57,46 @@ func Test_VaultPKI_notGoodFor(t *testing.T) {
 	}
 }
 
+func Test_VaulkPKI_goodFor(t *testing.T) {
+	tests := map[string]struct {
+		CertificateTTL time.Duration
+	}{
+		"one minute": {CertificateTTL: time.Minute},
+		"one hour":   {CertificateTTL: time.Hour},
+		"one day":    {CertificateTTL: time.Hour * 24},
+		"one week":   {CertificateTTL: time.Hour * 24 * 7},
+	}
+	for name, tc := range tests {
+		NotBefore := time.Now()
+		NotAfter := time.Now().Add(tc.CertificateTTL)
+		certificate := x509.Certificate{
+			Subject: pkix.Name{
+				Organization: []string{"Acme Co"},
+			},
+			NotBefore: NotBefore,
+			NotAfter:  NotAfter,
+		}
+
+		dur, ok := goodFor(&certificate)
+		if ok == false {
+			t.Errorf("%v: should be true", name)
+		}
+
+		ratio := dur.Seconds() / (NotAfter.Sub(NotBefore).Seconds())
+		// allow for a .01 epsilon for floating point comparison to prevent flakey tests
+		if ratio < .86 || ratio > .94 {
+			fmt.Println(ratio)
+			t.Errorf(
+				"%v: should be between 87 and 93, but was %.2f. NotBefore: %s, NotAfter: %s",
+				name,
+				ratio,
+				NotBefore,
+				NotAfter,
+			)
+		}
+	}
+}
+
 func Test_VaultPKI_pemsCert(t *testing.T) {
 	// tests w/ valid pems, and having it hidden behind various things
 	want := strings.TrimRight(strings.TrimSpace(validCert), "\n")