sieve: Add test versioning (#588)

See #470
exercism · Mar 15, 2017 · a645a8d · a645a8d
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diff --git a/exercises/sieve/example.go b/exercises/sieve/example.go
@@ -1,5 +1,7 @@
 package sieve
 
+const testVersion = 1
+
 func Sieve(limit int) (primes []int) {
 	c := make([]bool, limit)
 	for p := 2; p < limit; {

diff --git a/exercises/sieve/sieve_test.go b/exercises/sieve/sieve_test.go
@@ -5,6 +5,8 @@ import (
 	"testing"
 )
 
+const targetTestVersion = 1
+
 var p10 = []int{2, 3, 5, 7}
 var p1000 = []int{2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53,
 	59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137,
@@ -18,6 +20,12 @@ var p1000 = []int{2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53,
 	797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883,
 	887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997}
 
+func TestTestVersion(t *testing.T) {
+	if testVersion != targetTestVersion {
+		t.Fatalf("Found testVersion = %v, want %v", testVersion, targetTestVersion)
+	}
+}
+
 func TestSieve(t *testing.T) {
 	p := Sieve(10)
 	if !reflect.DeepEqual(p, p10) {