Add option to check for weak passwords

authentication/credentials/hibp_test.go

@@ -0,0 +1,23 @@
+package credentials
+
+import "testing"
+
+type isPasswordPwnedTest struct {
+	arg  string
+	exp1 bool
+	exp2 error
+}
+
+var isPasswordPwnedTests = []isPasswordPwnedTest{
+	{"", true, nil},
+	{"password", true, nil},
+	{"2y6bWMETuHpNP08HCZq00QAAzE6nmwEb", false, nil},
+}
+
+func TestIsPasswordPwned(t *testing.T) {
+	for _, test := range isPasswordPwnedTests {
+		if out1, out2 := IsPasswordPwned(test.arg); out1 != test.exp1 || out2 != test.exp2 {
+			t.Errorf("Output (%t,%q) not equal to expected (%t,%q)", out1, out2, test.exp1, test.exp2)
+		}
+	}
+}