cryptocore: support Go 1.4 in tests

internal/cryptocore/cryptocore_go1.4_test.go

@@ -0,0 +1,19 @@
+// +build !go1.5
+// = go 1.4 or lower
+
+package cryptocore
+
+import (
+	"testing"
+)
+
+// Native Go crypto with 128-bit IVs is only supported on Go 1.5 and up
+func TestCryptoCoreNewGo14(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Errorf("The code did not panic")
+		}
+	}()
+	key := make([]byte, 32)
+	New(key, false, true)
+}

internal/cryptocore/cryptocore_go1.5_test.go

@@ -0,0 +1,17 @@
+// +build go1.5
+// = go 1.5 or higher
+
+package cryptocore
+
+import (
+	"testing"
+)
+
+// Native Go crypto with 128-bit IVs is only supported on Go 1.5 and up
+func TestCryptoCoreNewGo15(t *testing.T) {
+	key := make([]byte, 32)
+	c := New(key, false, true)
+	if c.IVLen != 12 {
+		t.Fail()
+	}
+}

internal/cryptocore/cryptocore_test.go

@@ -16,10 +16,11 @@ func TestCryptoCoreNew(t *testing.T) {
 	if c.IVLen != 12 {
 		t.Fail()
 	}
-	c = New(key, false, true)
-	if c.IVLen != 16 {
+	c = New(key, false, false)
+	if c.IVLen != 12 {
 		t.Fail()
 	}
+	// "New(key, false, true)" is tested for Go 1.4 and 1.5+ seperately
 }
 
 // "New" should panic on any key not 32 bytes long