add Gplink::get_gpo_order()

and tests
needed for other tests, not for normal usage

src/adldap/gplink.cpp

@@ -269,3 +269,10 @@ void Gplink::set_option(const QString &gpo_case, const GplinkOption option, cons
 bool Gplink::equals(const Gplink &other) const {
     return (to_string() == other.to_string());
 }
+
+int Gplink::get_gpo_order(const QString &gpo_case) const {
+    const QString gpo = gpo_case.toLower();
+    const int out = gpo_list.indexOf(gpo);
+
+    return out;
+}

src/adldap/gplink.h

@@ -62,6 +62,8 @@ public:
 
     bool equals(const Gplink &other) const;
 
+    int get_gpo_order(const QString &gpo) const;
+
 private:
     QList<QString> gpo_list;
     QHash<QString, int> options;

tests/admc_test_gplink.cpp

@@ -263,4 +263,35 @@ void ADMCTestGplink::get_gpo_list() {
     QCOMPARE(actual_output, expected_output);
 }
 
+void ADMCTestGplink::get_gpo_order_data() {
+    QTest::addColumn<QList<QString>>("input");
+    QTest::addColumn<QString>("target_gpo");
+    QTest::addColumn<int>("expected_order");
+
+    const QList<QString> gpo_list = {
+        dn_A,
+        dn_B,
+        dn_C,
+    };
+
+    QTest::newRow("A") << gpo_list << dn_A << 0;
+    QTest::newRow("B") << gpo_list << dn_B << 1;
+    QTest::newRow("C") << gpo_list << dn_C << 2;
+}
+
+void ADMCTestGplink::get_gpo_order() {
+    QFETCH(QList<QString>, input);
+    QFETCH(QString, target_gpo);
+    QFETCH(int, expected_order);
+
+    Gplink gplink;
+
+    for (const QString &gpo : input) {
+        gplink.add(gpo);
+    }
+
+    const int actual_order = gplink.get_gpo_order(target_gpo);
+    QCOMPARE(actual_order, expected_order);
+}
+
 QTEST_MAIN(ADMCTestGplink)

tests/admc_test_gplink.h

@@ -52,6 +52,8 @@ private slots:
     void set_option();
     void get_gpo_list_data();
     void get_gpo_list();
+    void get_gpo_order_data();
+    void get_gpo_order();
 };
 
 #endif /* ADMC_TEST_GPLINK_H */