How to insert data into sql server using entity framework when id is identity column

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SQL

Visual-Studio

WebAPI

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I've simple table Test which has testId(primary key, indentity auto increament, not null) and testName. I'm using Web api2 and entity framework to get and post data. I need to post only testName testId should be set automotically. How it will be correct?

// POST: api/Checks
        [ResponseType(typeof(Check))]
        public IHttpActionResult PostCheck(Test test)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Tests.Add(test);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateException)
            {
                if (TestExists(test.testId))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = test.testId }, test);
        }