diff --git a/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary.go b/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary.go
index 79c4170b3..c46d08829 100644
--- a/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary.go
+++ b/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary.go
@@ -1 +1,21 @@
 package verifying_an_alien_dictionary
+
+func isAlienSorted(words []string, order string) bool {
+	m := make(map[byte]int)
+	for i := len(order) - 1; i >= 0; i-- {
+		m[order[i]] = i
+	}
+	if len(words) > 1 {
+		for pre, word := range words[1:] {
+			l, wl := len(words[pre]), len(word)
+			for i := 0; i < l; i++ {
+				if wl <= i || m[words[pre][i]] > m[word[i]] {
+					return false
+				} else if m[words[pre][i]] < m[word[i]] {
+					break
+				}
+			}
+		}
+	}
+	return true
+}
diff --git a/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary_test.go b/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary_test.go
index 79c4170b3..463ed0b7e 100644
--- a/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary_test.go
+++ b/problems/verifying-an-alien-dictionary/verifying_an_alien_dictionary_test.go
@@ -1 +1,35 @@
 package verifying_an_alien_dictionary
+
+import "testing"
+
+type caseType struct {
+	words    []string
+	order    string
+	expected bool
+}
+
+func TestIsAlienSorted(t *testing.T) {
+	tests := [...]caseType{
+		{
+			words:    []string{"hello", "leetcode"},
+			order:    "hlabcdefgijkmnopqrstuvwxyz",
+			expected: true,
+		},
+		{
+			words:    []string{"word", "world", "row"},
+			order:    "worldabcefghijkmnpqstuvxyz",
+			expected: false,
+		},
+		{
+			words:    []string{"apple", "app"},
+			order:    "abcdefghijklmnopqrstuvwxyz",
+			expected: false,
+		},
+	}
+	for _, tc := range tests {
+		output := isAlienSorted(tc.words, tc.order)
+		if output != tc.expected {
+			t.Fatalf("input: %v, output: %v, expected: %v", tc.words, output, tc.expected)
+		}
+	}
+}