kubeadm: add testcases for kubeadm reset

For parity with `init` and `join`, the test file only
covers some basic scenarios and is expected to be expanded
when the config file for `kubeadm reset` is ready.

Signed-off-by: Dave Chen <dave.chen@arm.com>

cmd/kubeadm/app/cmd/reset_test.go

@@ -0,0 +1,115 @@
+/*
+Copyright 2022 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 cmd
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	"k8s.io/apimachinery/pkg/util/sets"
+
+	"k8s.io/kubernetes/cmd/kubeadm/app/cmd/options"
+)
+
+func TestNewResetData(t *testing.T) {
+	testCases := []struct {
+		name        string
+		args        []string
+		flags       map[string]string
+		validate    func(*testing.T, *resetData)
+		expectError string
+		data        *resetData
+	}{
+		{
+			name: "flags parsed correctly",
+			flags: map[string]string{
+				options.CertificatesDir:       "/tmp",
+				options.NodeCRISocket:         "unix:///var/run/crio/crio.sock",
+				options.IgnorePreflightErrors: "all",
+				options.ForceReset:            "true",
+				options.DryRun:                "true",
+				options.CleanupTmpDir:         "true",
+			},
+			data: &resetData{
+				certificatesDir:       "/tmp",
+				criSocketPath:         "unix:///var/run/crio/crio.sock",
+				ignorePreflightErrors: sets.NewString("all"),
+				forceReset:            true,
+				dryRun:                true,
+				cleanupTmpDir:         true,
+			},
+		},
+		{
+			name: "fails if preflight ignores all but has individual check",
+			flags: map[string]string{
+				options.IgnorePreflightErrors: "all,something-else",
+			},
+			expectError: "don't specify individual checks if 'all' is used",
+		},
+		{
+			name: "pre-flights errors from CLI args",
+			flags: map[string]string{
+				options.IgnorePreflightErrors: "a,b",
+			},
+			validate: expectedResetIgnorePreflightErrors(sets.NewString("a", "b")),
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			// initialize an external reset option and inject it to the reset cmd
+			resetOptions := newResetOptions()
+			cmd := newCmdReset(nil, nil, resetOptions)
+
+			// sets cmd flags (that will be reflected on the reset options)
+			for f, v := range tc.flags {
+				cmd.Flags().Set(f, v)
+			}
+
+			// test newResetData method
+			data, err := newResetData(cmd, resetOptions, nil, nil)
+			if err != nil && !strings.Contains(err.Error(), tc.expectError) {
+				t.Fatalf("newResetData returned unexpected error, expected: %s, got %v", tc.expectError, err)
+			}
+			if err == nil && len(tc.expectError) != 0 {
+				t.Fatalf("newResetData didn't return error expected %s", tc.expectError)
+			}
+
+			if tc.data != nil {
+				if diff := cmp.Diff(tc.data, data, cmp.AllowUnexported(resetData{}), cmpopts.IgnoreFields(resetData{}, "client", "cfg")); diff != "" {
+					t.Fatalf("newResetData returned data (-want,+got):\n%s", diff)
+				}
+			}
+			// exec additional validation on the returned value
+			if tc.validate != nil {
+				tc.validate(t, data)
+			}
+		})
+	}
+}
+
+func expectedResetIgnorePreflightErrors(expected sets.String) func(t *testing.T, data *resetData) {
+	return func(t *testing.T, data *resetData) {
+		if !expected.Equal(data.ignorePreflightErrors) {
+			t.Errorf("Invalid ignore preflight errors. Expected: %v. Actual: %v", expected.List(), data.ignorePreflightErrors.List())
+		}
+		if data.cfg != nil && !expected.HasAll(data.cfg.NodeRegistration.IgnorePreflightErrors...) {
+			t.Errorf("Invalid ignore preflight errors in InitConfiguration. Expected: %v. Actual: %v", expected.List(), data.cfg.NodeRegistration.IgnorePreflightErrors)
+		}
+	}
+}