Add function pointer leak test (test_functions_recreate)

Author: Shapovalov Kirill

test/test_functions_recreate.js

@@ -0,0 +1,58 @@
+exports.test = function(sql, assert) {
+  // Test 1: Create a database, Register single function, close database, repeat 1000 times
+  for (var i = 1; i <= 1000; i++) 
+  {
+    let db = new sql.Database();
+    function add() {return i;}
+    try
+    {
+      db.create_function("TestFunction"+i, add)
+    }catch(e)
+    {
+      assert.ok(false,"Test 1: Recreate database "+i+"th times and register function failed with exception:"+e);
+      break;
+    }
+    var result = db.exec("SELECT TestFunction"+i+"()");
+    var result_str = result[0]["values"][0][0];
+    assert.equal(result_str, i, "Test 1: Recreate database "+i+"th times and register function");
+    db.close();
+  }
+  
+  // Test 2: Create a database, Register same function  1000 times, close database, repeat
+  {
+    let db = new sql.Database();
+    for (var i = 1; i <= 1000; i++) 
+    {
+      function add() {return i;}
+      try
+      {
+        db.create_function("TestFunction", add);
+      }catch(e)
+      {
+        assert.ok(false,"Test 2: Reregister function "+i+"th times failed with exception:"+e);
+        break;
+      }
+      var result = db.exec("SELECT TestFunction()");
+      var result_str = result[0]["values"][0][0];
+      assert.equal(result_str, i, "Test 2: Reregister function "+i+"th times");
+    }
+    db.close();
+  }
+};
+
+
+if (module == require.main) {
+	const target_file = process.argv[2];
+  const sql_loader = require('./load_sql_lib');
+  sql_loader(target_file).then((sql)=>{
+    require('test').run({
+      'test functions recreeate': function(assert){
+        exports.test(sql, assert);
+      }
+    });
+  })
+  .catch((e)=>{
+    console.error(e);
+    assert.fail(e);
+  });
+}