add input encoding test for exeecute

Author: sidorares

test/integration/connection/encoding/test-charset-results.js

@@ -7,6 +7,7 @@ var payload = 'привет, мир';
 
 function tryEncoding (encoding, cb) {
   connection.query('set character_set_results = ?', [encoding], function (err) {
+    assert.ifError(err);
     connection.query('SELECT ?', [payload], function (err, rows, fields) {
       assert.ifError(err);
       var iconvEncoding = encoding;
@@ -21,11 +22,38 @@ function tryEncoding (encoding, cb) {
   });
 }
 
+function tryEncodingExecute (encoding, cb) {
+  connection.execute('set character_set_results = ?', [encoding], function (err) {
+    assert.ifError(err);
+    connection.execute('SELECT ? as n', [payload], function (err, rows, fields) {
+      assert.ifError(err);
+      var iconvEncoding = encoding;
+      if (encoding == 'utf8mb4') {
+        iconvEncoding = 'utf8';
+      }
+      assert.equal(mysql.CharsetToEncoding[fields[0].characterSet], iconvEncoding);
+      // TODO: figure out correct metadata encodings setup for binary protocol
+      //  assert.equal(fields[0].name, payload);
+      assert.equal(rows[0][fields[0].name], payload);
+      cb();
+    });
+  });
+}
+
+// christmas tree!!! :)
 tryEncoding('cp1251', function () {
   tryEncoding('koi8r', function () {
     tryEncoding('cp866', function () {
       tryEncoding('utf8mb4', function () {
-        connection.end();
+        tryEncodingExecute('cp1251', function () {
+          tryEncodingExecute('koi8r', function () {
+            tryEncodingExecute('cp866', function () {
+              tryEncodingExecute('utf8mb4', function () {
+                connection.end();
+              });
+            });
+          });
+        });
       });
     });
   });