feat: seed secure demo merchant identity

internal/identity/password_test.go

@@ -0,0 +1,24 @@
+package identity
+
+import "testing"
+
+func TestHashPasswordAndVerifyPassword(t *testing.T) {
+	t.Parallel()
+	hash, err := HashPassword("correct horse battery staple")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !VerifyPassword("correct horse battery staple", hash) {
+		t.Fatal("VerifyPassword() = false, want true")
+	}
+	if VerifyPassword("incorrect password", hash) {
+		t.Fatal("VerifyPassword() = true for incorrect password")
+	}
+}
+
+func TestHashPasswordRejectsShortPassword(t *testing.T) {
+	t.Parallel()
+	if _, err := HashPassword("short"); err == nil {
+		t.Fatal("HashPassword() error = nil, want length error")
+	}
+}