tests: add Common placeholder smoke/gtest tests and MockCoordTrans

Lts/Common/CommonUnitTestsPlaceholder/coordTransTests_smoke.cpp

@@ -0,0 +1,15 @@
+#include <QtTest/QtTest>
+#include "mocks/MockCoordTrans.h"
+
+class CoordTransSmoke : public QObject {
+  Q_OBJECT
+private slots:
+  void testForward() {
+    auto p = MockCoordTrans::forward(10.0, 20.0);
+    QVERIFY(qFuzzyCompare(p.first, 10.0 * 111000.0));
+    QVERIFY(qFuzzyCompare(p.second, 20.0 * 111000.0));
+  }
+};
+
+QTEST_MAIN(CoordTransSmoke)
+#include "coordTransTests_smoke.moc"