diff --git a/service/auth_test.go b/service/auth_test.go
new file mode 100644
index 0000000..7b62f3b
--- /dev/null
+++ b/service/auth_test.go
@@ -0,0 +1,40 @@
+package service
+
+import (
+	"testing"
+)
+
+func TestValidPasswords(t *testing.T) {
+	passwords := []string{
+		"aB!'2d2y", //normal
+		"v-#:j`fQurudEEUk#xA)uzI-B+'eZW3`F*5Eaf+{YID#PWuD.TbyH'f<MC)Ck$!]K[K6~dIN&R'mRaKO,qpDpP'*A!/}73=ilK_COqM/Q%!(hyS8V75e2@J2k223T`tv", // 128 characters
+		`aB!"'2d2y`, // include " in password
+	}
+
+	for _, password := range passwords {
+
+		err := checkPassword(password)
+		if err != nil {
+			t.Errorf("Expected nil, got error")
+		}
+	}
+}
+func TestInvalidPasswords(t *testing.T) {
+	passwords := []string{
+		"aB!'2d2",   // too short
+		"",          // empty
+		"ab123SSa",  // no special character
+		"passwor1!", // no uppercase
+		"PASSWOR1!", // no lowercase
+		"Password!", // no number
+		"Password1", // no special character
+	}
+
+	for _, password := range passwords {
+
+		err := checkPassword(password)
+		if err == nil {
+			t.Errorf("Expected error, got nil")
+		}
+	}
+}