test: add unit-tests for internal/version.go (#977)

Signed-off-by: Akanksha Gahalot <akankshagahlot0307@gmail.com>

internal/version/version_test.go

@@ -0,0 +1,28 @@
+/*
+Copyright The ORAS Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package version
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_GetVersion_when_BuildData_is_empty(t *testing.T) {
+	BuildMetadata = ""
+	expected := Version
+	actual := GetVersion()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Tested GetVersion expected was %v actually got %v", expected, actual)
+	}
+}