CSRF token mismatch. ($this->withoutExceptionHandling() not doing its job)

Hey there,

The test suite passes sometimes but not others. I'm at a loss as to why this occurs randomly.

Using sqlite, :memory: local env.

/** @test
     *
     * @throws Illuminate\Session\TokenMismatchException
     */
    public function registering_with_a_valid_invitation_code()
    {
        $this->withoutExceptionHandling();
//        dd(env('APP_ENV'));
        $shelley = factory(User::class)->create([
                    'firstname' => 'Shelley',
                    'email' => '[email protected]',
        ]);
        $this->assertEquals(1, User::count());
        $invitation = factory(Invitation::class)->create([
            'inviter_user_id' => $shelley->id,
            'invitation_code' => 'TESTCODE1234',
        ]);

        $this->assertDatabaseHas('users', [
            'email' => '[email protected]',
        ]);

        $response = $this->from('/invitations/TESTCODE1234')->post('/invitations/register', [
            'firstname' => 'John',
            'lastname' => 'Smith',
            'email' => '[email protected]',
            'password' => 'secretsecret',
            'password_confirmation' => 'secretsecret',
            'invitation_code' => 'TESTCODE1234',
        ]);

        $response->assertRedirect('/email/verify');

        $this->assertEquals(2, User::count());
        $inviterShelley = User::first();
        $john = User::find(2);

        $this->actingAs($john);
        $this->assertEquals('[email protected]', $inviterShelley->email);
        $this->assertEquals('[email protected]', $john->email);
        $this->assertTrue(Hash::check('secretsecret', $john->password));

//        dd($invitation);
//        dd($invitation->fresh()->invitedUser);
        $this->assertTrue($invitation->fresh()->invitedUser->is($john));

        $this->assertDatabaseHas('users', [
            'email' => '[email protected]',
        ]);

        $this->assertDatabaseHas('invitations', [
            'user_id' => $john->id,
        ]);

    }