diff --git a/zxcvbn_test.go b/zxcvbn_test.go
new file mode 100644
index 0000000..cc0369d
--- /dev/null
+++ b/zxcvbn_test.go
@@ -0,0 +1,70 @@
+package zxcvbn
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"os/exec"
+	"testing"
+	"testing/quick"
+	"time"
+)
+
+func TestPasswordStrength(t *testing.T) {
+	cfg := &quick.Config{Rand: rand.New(rand.NewSource(time.Now().Unix()))}
+	err := quick.CheckEqual(GoPasswordStrength, PythonPasswordStrength, cfg)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func GoPasswordStrength(password string, userInputs []string) float64 {
+	return PasswordStrength(password, userInputs).Entropy
+}
+
+func PythonPasswordStrength(password string, userInputs []string) float64 {
+	cmd := exec.Command("python", append([]string{"-", password}, userInputs...)...)
+	cmd.Stdin = bytes.NewBufferString(py)
+
+	o, err := cmd.CombinedOutput()
+	if err != nil {
+		fmt.Println("outErr:", err)
+	}
+
+	var pmatch pyMatch
+	if err := json.Unmarshal(o, &pmatch); err != nil {
+		fmt.Println("json:", err)
+	}
+
+	return pmatch.Entropy
+}
+
+const py = `import zxcvbn
+import json
+import sys
+
+print json.dumps(zxcvbn.password_strength(sys.argv[1], sys.argv[2:len(sys.argv)]))
+`
+
+type pyMatch struct {
+	CalcTime         float64 `json:"calc_time"`
+	CrackTime        float64 `json:"crack_time"`
+	CrackTimeDisplay string  `json:"crack_time_display"`
+	Entropy          float64 `json:"entropy"`
+	MatchSequence    []struct {
+		BaseEntropy      float64 `json:"base_entropy"`
+		DictionaryName   string  `json:"dictionary_name"`
+		Entropy          float64 `json:"entropy"`
+		I                int64   `json:"i"`
+		J                int64   `json:"j"`
+		L33tEntropy      float64 `json:"l33t_entropy"`
+		MatchedWord      string  `json:"matched_word"`
+		Pattern          string  `json:"pattern"`
+		Rank             int64   `json:"rank"`
+		Token            string  `json:"token"`
+		UppercaseEntropy float64 `json:"uppercase_entropy"`
+	} `json:"match_sequence"`
+	Password string  `json:"password"`
+	Score    float64 `json:"score"`
+}