You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_Poisson.m
    path of file: ./repos/chebfun/tests/diskfun
    
    the code of the file until where you have to start completion: function pass = test_Poisson( ) 
% Check correctness of Poisson solver on the disk: 

tol = 2e3*chebfunpref().cheb2Prefs.chebfun2eps;
 
% Simple examples

% Example 1: use laplacian to check; use nonzero bcs 
%input is a diskfun
tru = @(t,r) exp(-r.*cos(t)-r.^2.*sin(2*t));
tru = diskfun(tru, 'polar'); 
bc = @(t,r) exp(-cos(t)-sin(2*t)); 
rhs = laplacian(tru); 
u = diskfun.poisson(rhs,bc, 100); 
pass(1) = ( norm(u - tru) < 2e4*tol ); 

%input coeffs 
rhs = coeffs2(rhs); 
u2 = diskfun.poisson(rhs,bc, 100); 
pass(2) = ( norm(u2-u) < tol) ; 

% Example 2: use function handle
bc = @(th) 0*th;              
f = @(th, r) -1 + 0*th;            
u = diskfun.poisson( f, bc, 100);

    
function pass = test_Poisson( ) 
% Check correctness of Poisson solver on the disk: 

tol = 2e3*chebfunpref().cheb2Prefs.chebfun2eps;
 
% Simple examples

% Example 1: use laplacian to check; use nonzero bcs 
%input is a diskfun
tru = @(t,r) exp(-r.*cos(t)-r.^2.*sin(2*t));
tru = diskfun(tru, 'polar'); 
bc = @(t,r) exp(-cos(t)-sin(2*t)); 
rhs = laplacian(tru); 
u = diskfun.poisson(rhs,bc, 100); 
pass(1) = ( norm(u - tru) < 2e4*tol ); 

%input coeffs 
rhs = coeffs2(rhs); 
u2 = diskfun.poisson(rhs,bc, 100); 
pass(2) = ( norm(u2-u) < tol) ; 

% Example 2: use function handle
bc = @(th) 0*th;              
f = @(th, r) -1 + 0*th;            
u = diskfun.poisson( f, bc, 100);
exact = diskfun(@(t,r) -.25*r.^2+.25, 'polar');
pass(3) = ( norm(u - exact) < tol ); 

%Example 3: eigenfunction
lam = 5.52007811028631;
rhs = -(lam)^2*diskfun.harmonic(0,2);
tru = diskfun.harmonic(0,2); 
u = diskfun.poisson(rhs, @(t) 0*t, 100); 
pass(4) = ( norm(tru-u) < tol) ;

end