Adds Kubernetes provider support

Co-authored-by: Julien Salleyron <julien@containo.us>

provider/kubernetes/client_test.go

@@ -0,0 +1,49 @@
+package kubernetes
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	kubeerror "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestTranslateNotFoundError(t *testing.T) {
+	testCases := []struct {
+		desc           string
+		err            error
+		expectedExists bool
+		expectedError  error
+	}{
+		{
+			desc:           "kubernetes not found error",
+			err:            kubeerror.NewNotFound(schema.GroupResource{}, "foo"),
+			expectedExists: false,
+			expectedError:  nil,
+		},
+		{
+			desc:           "nil error",
+			err:            nil,
+			expectedExists: true,
+			expectedError:  nil,
+		},
+		{
+			desc:           "not a kubernetes not found error",
+			err:            fmt.Errorf("bar error"),
+			expectedExists: false,
+			expectedError:  fmt.Errorf("bar error"),
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			exists, err := translateNotFoundError(test.err)
+			assert.Equal(t, test.expectedExists, exists)
+			assert.Equal(t, test.expectedError, err)
+		})
+	}
+}