How to use the assert.notEqual function in assert

// createUser() test
  var name = "test-user-" + Math.floor(Math.random() * Math.pow(2, 32)).toString(16);
  rv["createUser-1"] =  dn.createUser("hello", name);
  assert.notEqual(rv["createUser-1"], null, "No ID field present in createUser() return value");

  // createEmptyObject() tests
  rv["createEmptyObject-1"] = dn.createEmptyObject();
  assert.notEqual(rv["createEmptyObject-1"], null, "No ID field present in createEmptyObject() return value");

  rv["createEmptyObject-2"] = dn.createEmptyObject({blah: "foo"}, null);
  assert.notEqual(rv["createEmptyObject-2"], null, "No ID field present in createEmptyObject() return value");

  // getObjectPropertiesAndRelationships() tests
  rv["getObjectPropertiesAndRelationships-1"] = dn.getObjectPropertiesAndRelationships(rv["createEmptyObject-2"]);
  assert.notEqual(rv["getObjectPropertiesAndRelationships-1"].properties && rv["getObjectPropertiesAndRelationships-1"].relationships, false, "properties and relationships field must be present in getObjectPropertiesAndRelationships() output");
  assert.equal(rv["getObjectPropertiesAndRelationships-1"]["properties"].blah, "foo", "The property blah was set to \"foo\". Must be returned back same");

  rv["createEmptyObject-3"] = dn.createEmptyObject(null, null);
  assert.notEqual(rv["createEmptyObject-3"], null, "No ID field present in createEmptyObject() return value");

  // getObjectProperties() and updateObjectProperties() tests
  dn.updateObjectProperties(rv["createEmptyObject-1"], {xyz: "blah", xyz2: "blah2"});
  rv["getObjectProperties-1"] = dn.getObjectProperties(rv["createEmptyObject-1"]);
  assert.ok(rv["getObjectProperties-1"].xyz == "blah" && rv["getObjectProperties-1"].xyz2 == "blah2", "Properties returned back do not match the properties set");
// assert.ok(false, "HEREEEE");
  // listObjects() test
   // dn.setObjectProperty(rv["createEmptyObject-1"], "blah", "foooooo");
  rv["listObjects-1"] = dn.listObjects();
  assert.ok(rv["listObjects-1"].length >= 3, "Number of objects returned by listObjects() cannot be less than 3 at this point of code (after 3 createEmptyObject() succesful tests)");
  assert.notEqual(rv["listObjects-1"][0].id, null, "Field ID should be present with all objects in the output of listObjects()");

serviceBusService.listTopics({ top: 2, skip: 1 }, function (listError2, listTopics2) {
                assert.equal(listError2, null);
                assert.notEqual(listTopics2, null);
                assert.equal(listTopics2.length, 2);

                // results are ordered by alphabetic order so
                // topicName2 and topicName3 should be in the result
                topicCount = 0;
                for (topic in listTopics2) {
                  currentTopic = listTopics2[topic];
                  if (currentTopic.TopicName === topicName2) {
                    topicCount += 1;
                  } else if (currentTopic.TopicName === topicName3) {
                    topicCount += 2;
                  }
                }

                assert.equal(topicCount, 3);

it('not null', () => {
            const file = utils.filePath('.');
            assert.notEqual(null, file);
            assert.notEqual('', file);
        });

it('should return a copy of the original', function(){
            var copy1 = NamedColor.getNames(),
                copy2 = NamedColor.getNames();

            assert.equal( copy1.length, copy2.length );
            copy1.pop();
            assert.notEqual( copy1.length, copy2.length );
        });

return Client.CreateFile(testFileName, null, new Buffer(testFileContent)).then(function (response) {
                assert.notEqual(response.mimeType, 'application/vnd.google-apps.folder');
                assert.equal(response.title, testFileName);
                testFileID = response.id;
            })
        })

sCluster.node(host.address).getLogs(function(err, logs) {
                assert.ifError(err);
                let prepareQuery;
                for(let i = 0; i < logs.length; i++) {
                  const queryLog = logs[i];
                  if (queryLog.type === "PREPARE" && queryLog.query === query) {
                    prepareQuery = queryLog;
                  }
                }
                if (!prepareQuery) {
                  assert.strictEqual(nodeDownAddress, host.address);
                } else {
                  assert.notEqual(prepareQuery, undefined);
                }
                nextHost();
              });
            }, next);

assert.notEqual(signature.documentation, null);
	assert.equal(signature.documentation, docs.getDocumentation("signatureCopy_Signature1"));
	assert.equal(signature.parameters.length, 6);
	assert.equal(signature.parameters[0].label, "[flags]");
	assert.notEqual(signature.parameters[0].documentation, null);
	assert.equal(signature.parameters[0].documentation, docs.getDocumentation("signatureCopy_Signature1_Param0"));
	assert.equal(signature.parameters[1].label, "[");
	assert.equal(signature.parameters[1].documentation, null);
	assert.equal(signature.parameters[2].label, "\"source\"");
	assert.notEqual(signature.parameters[2].documentation, null);
	assert.equal(signature.parameters[2].documentation, docs.getDocumentation("signatureCopy_Signature1_Param2"));
	assert.equal(signature.parameters[3].label, "...");
	assert.notEqual(signature.parameters[3].documentation, null);
	assert.equal(signature.parameters[3].documentation, docs.getDocumentation("signatureCopy_Signature1_Param3"));
	assert.equal(signature.parameters[4].label, "\"dest\"");
	assert.notEqual(signature.parameters[4].documentation, null);
	assert.equal(signature.parameters[4].documentation, docs.getDocumentation("signatureCopy_Signature1_Param4"));
	assert.equal(signature.parameters[5].label, "]");
	assert.equal(signature.parameters[5].documentation, null);
}

it('has a description', () => {
    assert.notEqual(command.description, null);
  });

it('has a description', () => {
    assert.notEqual(command.description, null);
  });

it('fails validation if webUrl is not specified', () => {
    const actual = (command.validate() as CommandValidate)({ options: { id: '9b142c22-037f-4a7f-9017-e9d8c0e34b99' } });
    assert.notEqual(actual, true);
  });