model: add UT for DefaultInstanceGroupVolumeSize

Signed-off-by: Zhou Hao <zhouhao@cn.fujitsu.com>

pkg/model/defaults/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -7,3 +7,10 @@ go_library(
     visibility = ["//visibility:public"],
     deps = ["//pkg/apis/kops:go_default_library"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["volumes_test.go"],
+    embed = [":go_default_library"],
+    deps = ["//pkg/apis/kops:go_default_library"],
+)

pkg/model/defaults/volumes_test.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2020 The Kubernetes 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 defaults
+
+import (
+	"testing"
+
+	"k8s.io/kops/pkg/apis/kops"
+)
+
+func TestDefaultInstanceGroupVolumeSize(t *testing.T) {
+	tests := []struct {
+		role     kops.InstanceGroupRole
+		expected int32
+	}{
+		{
+			role:     "Node2",
+			expected: -1,
+		},
+	}
+	for _, test := range tests {
+		result, _ := DefaultInstanceGroupVolumeSize(test.role)
+		if test.expected != result {
+			t.Errorf("Expected %d, got %d", test.expected, result)
+		}
+	}
+}