feat(providers): add basic test for GKMS

Signed-off-by: Mateusz Hromada <[email protected]>

# Conflicts:
#	pkg/stringprovider/stringprovider.go
#	vals.go

vals_gkms_test.go

@@ -0,0 +1,66 @@
+package vals
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestValues_GKMS(t *testing.T) {
+	// TODO
+	// create gkms and encrypt test value
+	//  gcloud kms keyrings create "test" --location "global"
+	//  gcloud kms keys create "default" --location "global" --keyring "test" --purpose "encryption"
+	//  echo -n "test_value" \
+	//    | gcloud kms encrypt \
+	//      --location "global" \
+	//      --keyring "test" \
+	//      --key "default" \
+	//      --plaintext-file - \
+	//      --ciphertext-file - \
+	//    | base64 -w0 \
+	//    | tr '/+' '_-'
+	//
+	// run with:
+	//
+	//	go test -run '^(TestValues_GKMS)$'
+
+	type testcase struct {
+		template map[string]interface{}
+		expected map[string]interface{}
+	}
+
+	plain_value := "test_value"
+	encrypted_value := "CiQAmPqoGAKT97oUK0DdiI_cLDm3j6iPDK4-TJ3yQII-snFHCckSMwAkTpnEoD5wOeRaZrt3eC1ewFMuw617fqqjTStrsar9ciGERzk5t6uMgA0HKzSxGMdjHQ=="
+
+	project := "test-project"
+	location := "global"
+	keyring := "test"
+	crypto_key := "default"
+
+	testcases := []testcase{
+		{
+			template: map[string]interface{}{
+				"test_key": fmt.Sprintf("ref+gkms://%s?project=%s&location=%s&keyring=%s&crypto_key=%s", encrypted_value, project, location, keyring, crypto_key),
+			},
+			expected: map[string]interface{}{
+				"test_key": plain_value,
+			},
+		},
+	}
+
+	for i := range testcases {
+		tc := testcases[i]
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			vals, err := Eval(tc.template)
+			if err != nil {
+				t.Fatalf("%v", err)
+			}
+			diff := cmp.Diff(tc.expected, vals)
+			if diff != "" {
+				t.Errorf("unexpected diff: %s", diff)
+			}
+		})
+	}
+}