Not getting results with datastore.GetAll in golang

I have two functions: one which writes entities to datastore and the other is suppose to retrieve them. When I use datastore.GetAll() function in my retrieval it returns no results. I do have a test that verifies that the writing seems to be working correctly. Any ideas as to why retrieval isn't working?

Here is the application code:

package tracker

import (
   "fmt"

   "appengine"
   "appengine/datastore"
)

type User struct {
    Email string
}

func createUser(ctx appengine.Context, email string) (*datastore.Key, error) {
    u := &User{
        Email: email,
        }
    incompleteKey := datastore.NewIncompleteKey(ctx, "User", nil)
    key, err := datastore.Put(ctx, incompleteKey, u)
    if err != nil {
        return key, err
    }

    return key, nil
}

func getUser(ctx appengine.Context, email string) (u *User, e error) {
    users := []User{}
    q := datastore.NewQuery("User").Filter("Email", email)
    keys, err := q.GetAll(ctx, &users)
    if err != nil {
        return nil, err
    }
    fmt.Printf("KEYS: %v", keys)
    return &users[0], nil
}

Here is the test code:

package tracker

import (
    "fmt"
    "testing"

    "appengine/datastore"
    "appengine/aetest"
)

// This test is passing.
func TestCreateUser(t *testing.T) {
    ctx, err := aetest.NewContext(nil)
    if err != nil {
        t.Fatal(err)
    }
    defer ctx.Close()

    email := "testing@testing.go"
    newKey, err := createUser(ctx, email)
    if err != nil {
        t.Errorf("Failed to create a new user: %v", err)
    }

    u := User{}
    datastore.Get(ctx, newKey, &u)

    if u.Email != email {
        t.Errorf("Expected email to be %s, found %v.", email, u.Email)
    }
}

func TestGetUser(t *testing.T) {
    ctx, err := aetest.NewContext(nil)
    if err != nil {
        t.Fatal(err)
    }
    defer ctx.Close()

    email := "testing@testing.go"
    newKey, err := createUser(ctx, email)
    fmt.Printf("key, %v; ", newKey)
    u, err := getUser(ctx, newKey)
    fmt.Printf("user, %v; error: %s", u, err)

    if u.Email != email {
        t.Error("Expected email to be %s, found %v.", email, u.Email)
    }
}