Fix linting errors (#16)

Author: sethvargo

diceware/generate.go

@@ -172,7 +172,7 @@ func RollWord(d int) (int, error) {
 func (g *Generator) RollDie() (int, error) {
 	r, err := rand.Int(g.randReader, sides)
 	if err != nil {
-		return 0, err
+		return 0, fmt.Errorf("failed to generate a random number: %w", err)
 	}
 	return int(r.Int64()) + 1, nil
 }

diceware/generate_test.go

@@ -11,11 +11,13 @@ const (
 	N = 10000
 )
 
-func testUnique(t testing.TB, list []string) {
+func testUnique(tb testing.TB, list []string) {
+	tb.Helper()
+
 	seen := make(map[string]struct{}, len(list))
 	for _, v := range list {
 		if _, ok := seen[v]; ok {
-			t.Errorf("found duplicate: %q", list)
+			tb.Errorf("found duplicate: %q", list)
 		}
 		seen[v] = struct{}{}
 	}
@@ -82,8 +84,6 @@ func TestGenerateWordList(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 

diceware/word_list.go

@@ -12,15 +12,17 @@ type WordList interface {
 	WordAt(int) string
 }
 
-// WordListNumWordser is an auxillary interface that returns the number of words
-// in the list. This is a separate interface for backwards compatability.
+// WordListNumWordser is an auxiliary interface that returns the number of words
+// in the list. This is a separate interface for backwards compatibility.
 type WordListNumWordser interface {
 	// NumWords returns the total number of words in the list.
 	NumWords() int
 }
 
-var _ WordList = (*wordListInternal)(nil)
-var _ WordListNumWordser = (*wordListInternal)(nil)
+var (
+	_ WordList           = (*wordListInternal)(nil)
+	_ WordListNumWordser = (*wordListInternal)(nil)
+)
 
 type wordListInternal struct {
 	digits int