test connection and backend event exchange during COPY TO/FROM

test/integration/connection/copy-tests.js

@@ -0,0 +1,44 @@
+var helper = require(__dirname+"/test-helper");
+var assert = require('assert');
+
+test('COPY FROM events check', function () {
+ helper.connect(function (con) {
+    var stdinStream = con.query('COPY person FROM STDIN'); 
+    con.on('copyInResponse', function () {
+      con.endCopyFrom(); 
+    });
+    assert.emits(con, 'copyInResponse',
+      function () {
+        con.endCopyFrom();
+      },
+      "backend should  emit copyInResponse after COPY FROM query"
+    ); 
+    assert.emits(con, 'commandComplete',
+      function () {
+        con.end();
+      },
+      "backend should emit commandComplete after COPY FROM stream ends"
+    )
+  });
+});
+test('COPY TO events check', function () {
+  helper.connect(function (con) {
+    var stdoutStream = con.query('COPY person TO STDOUT');
+    assert.emits(con, 'copyOutResponse',
+      function () {
+      },
+      "backend should emit copyOutResponse after COPY TO query"
+    );
+    assert.emits(con, 'copyData',
+      function () {
+      },
+      "backend should emit copyData on every data row"
+    );
+    assert.emits(con, 'copyDone',
+      function () {
+        con.end();
+      },
+      "backend should emit copyDone after all data rows"
+    );
+  });
+});