label          string
		listenOnSocket bool
		expectSocket   bool
		expectError    bool
		invalidFile    bool
	}{
		{
			label:          "Domain Socket file",
			listenOnSocket: true,
			expectSocket:   true,
			expectError:    false,
		},
		{
			label:       "Non Existent file",
			invalidFile: true,
			expectError: true,
		},
		{
			label:          "Regular file",
			listenOnSocket: false,

			// Parse error as the yaml file itself is not valid yaml.
			output, err = istioctlSafe(t, istioCtl, ns.Name(), false, invalidFile)
			g.Expect(strings.Join(output, "\n")).To(ContainSubstring("Error(s) adding files"))
			g.Expect(strings.Join(output, "\n")).To(ContainSubstring(fmt.Sprintf("errors parsing content \"%s\"", invalidFile)))

			g.Expect(err).To(MatchError(analyze.FileParseError{}))

	if string(m) != expect {
		t.Errorf("drop: expected %q got %q", expect, m)
	}

	// 6. Invalid rune
	invalidRune := func(r rune) rune {
		return utf8.MaxRune + 1
	}
	m = Map(invalidRune, []byte("x"))
	expect = "\uFFFD"
	if string(m) != expect {
		t.Errorf("invalidRune: expected %q got %q", expect, m)
	}
}

func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) }