Add back install_test

pkg/minikube/driver/install_test.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2019 The Kubernetes Authors All rights reserved.
+
+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 driver
+
+import (
+	"testing"
+)
+
+func TestExtractVMDriverVersion(t *testing.T) {
+	v := extractVMDriverVersion("")
+	if len(v) != 0 {
+		t.Error("Expected empty string")
+	}
+
+	v = extractVMDriverVersion("random text")
+	if len(v) != 0 {
+		t.Error("Expected empty string")
+	}
+
+	expectedVersion := "1.2.3"
+
+	v = extractVMDriverVersion("version: v1.2.3")
+	if expectedVersion != v {
+		t.Errorf("Expected version: %s, got: %s", expectedVersion, v)
+	}
+
+	v = extractVMDriverVersion("version: 1.2.3")
+	if expectedVersion != v {
+		t.Errorf("Expected version: %s, got: %s", expectedVersion, v)
+	}
+}