Increase test coverage

Added test cases:
	WriteFiles
	TabWriter
	NewRedfishRemoteDirectClient

Updated:
	ReadYAMLFile	=> new test case with invalid yaml file

Change-Id: I06c6f2eefd1c1c1659e0bf3c08fbe28628c80725

pkg/remote/redfish/redfish_test.go

@@ -240,6 +240,49 @@ func getTestSystem() redfishClient.ComputerSystem {
 	}
 }
 
+func TestNewRedfishRemoteDirectClient(t *testing.T) {
+	m := &redfishMocks.RedfishAPI{}
+	defer m.AssertExpectations(t)
+
+	_, err := NewRedfishRemoteDirectClient(
+		context.Background(),
+		defaultURL,
+		computerSystemID,
+		"/tmp/test.iso",
+	)
+	assert.NoError(t, err)
+
+	// Test with empty remote URL
+	_, err = NewRedfishRemoteDirectClient(
+		context.Background(),
+		"",
+		computerSystemID,
+		"/tmp/test.iso",
+	)
+	expectedError := "missing configuration: redfish remote url empty"
+	assert.EqualError(t, err, expectedError)
+
+	// Test with empty ephemeral NodeID
+	_, err = NewRedfishRemoteDirectClient(
+		context.Background(),
+		defaultURL,
+		"",
+		"/tmp/test.iso",
+	)
+	expectedError = "missing configuration: redfish ephemeral node id empty"
+	assert.EqualError(t, err, expectedError)
+
+	// Test with empty Iso Path
+	_, err = NewRedfishRemoteDirectClient(
+		context.Background(),
+		defaultURL,
+		computerSystemID,
+		"",
+	)
+	expectedError = "missing configuration: redfish ephemeral node iso Path empty"
+	assert.EqualError(t, err, expectedError)
+}
+
 func getDefaultRedfishRemoteDirectObj(t *testing.T, api redfishAPI.RedfishAPI) RemoteDirect {
 	t.Helper()
 

pkg/util/configreader_test.go

@@ -20,4 +20,9 @@ func TestReadYAMLFile(t *testing.T) {
 	actualString := actual["testString"]
 	expectedString := "test"
 	assert.Equal(expectedString, actualString)
+
+	// test using an incorrect yaml
+	err = util.ReadYAMLFile("testdata/incorrect.yaml", &actual)
+	expectedString = "error converting YAML to JSON"
+	require.Contains(err.Error(), expectedString)
 }

pkg/util/tabwriter_test.go

@@ -0,0 +1,45 @@
+package util_test
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"opendev.org/airship/airshipctl/pkg/util"
+)
+
+func TestNewTabWriter(t *testing.T) {
+	var tests = []struct {
+		testname, src, expected string
+	}{
+		{
+			"empty-string",
+			"",
+			"\n",
+		},
+		{
+			"newline-test",
+			"\n",
+			"\n\n",
+		},
+		{
+			"format-string",
+			"airshipctl\tconfig\tinit",
+			"airshipctl   config   init\n",
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.testname, func(t *testing.T) {
+			var buf bytes.Buffer
+			out := util.NewTabWriter(&buf)
+			fmt.Fprintln(out, tt.src)
+			err := out.Flush()
+			assert.NoError(t, err)
+			assert.Equal(t, tt.expected, buf.String())
+		})
+	}
+}

pkg/util/testdata/incorrect.yaml

@@ -0,0 +1,3 @@
+--
+testString: incorrectYamlSyntax
+...

pkg/util/writefiles_test.go

@@ -0,0 +1,35 @@
+package util_test
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"opendev.org/airship/airshipctl/pkg/util"
+	"opendev.org/airship/airshipctl/testutil"
+)
+
+func TestWriteFiles(t *testing.T) {
+	testDir, cleanup := testutil.TempDir(t, "test-dir")
+	defer cleanup(t)
+
+	fls := make(map[string][]byte)
+	dummyData := []byte("")
+	testFile1 := filepath.Join(testDir, "testFile1")
+	testFile2 := filepath.Join(testDir, "testFile2")
+	fls[testFile1] = dummyData
+	fls[testFile2] = dummyData
+	err := util.WriteFiles(fls, 0600)
+
+	assert.NoError(t, err)
+
+	// check if all files are created
+	assert.FileExists(t, testFile1)
+	assert.FileExists(t, testFile2)
+
+	// check if files are readable
+	_, err = ioutil.ReadFile(testFile1)
+	assert.NoError(t, err)
+}