example: add simple test to check correct linkage

- needs to be 3.14 compatible
- fixes #27

exampleApp/test/exampleTest.c

@@ -0,0 +1,58 @@
+/*************************************************************************\
+* Copyright (c) 2020 ITER Organization.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution.
+\*************************************************************************/
+
+/*
+ *  Author: Ralph Lange <ralph.lange@gmx.de>
+ */
+
+#include <string.h>
+
+#include <epicsUnitTest.h>
+#include <testMain.h>
+
+#include <dbAccess.h>
+#include <dbStaticLib.h>
+#include <errlog.h>
+
+void exampleTest_registerRecordDeviceDriver(struct dbBase *);
+
+static dbCommon *prec;
+
+/* from Base 3.15 dbUnitTest.c */
+static
+dbCommon* testdbRecordPtr(const char* pv)
+{
+    DBADDR addr;
+
+    if (dbNameToAddr(pv, &addr))
+        testAbort("Missing record \"%s\"", pv);
+
+    return addr.precord;
+}
+
+static void testOnce(void)
+{
+    testDiag("check that tests work");
+
+    dbReadDatabase(&pdbbase, "example.dbd", "../../../dbd", NULL);
+    exampleTest_registerRecordDeviceDriver(pdbbase);
+    dbReadDatabase(&pdbbase, "dbExample1.db", "../../../db", "user=test");
+
+    testDiag("Searching for records from example application");
+
+    prec = testdbRecordPtr("test:xxxExample");
+    testOk((prec != NULL), "record test:xxxExample");
+
+    prec = testdbRecordPtr("test:aiExample");
+    testOk((prec != NULL), "record test:aiExample");
+}
+
+MAIN(exampleTest)
+{
+    testPlan(2);
+    testOnce();
+    return testDone();
+}