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index.spec.js
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index.spec.js
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const test = require( 'tape' );
const subscribe = require( '.' );
const range = function* ( start, end ) {
let current = start;
while ( current <= end ) {
yield current;
current = current + 1;
}
}
test( "subscribe() should pull from its source", assert => {
assert.plan( 2 );
const source = ( type, data ) => {
const iter = range( 0, 3 );
if ( type === 0 ) data( 0, ( t ) => {
if ( t === 1 ) {
const { done, value } = iter.next();
if ( done ) data( 2 );
else data( 1, value );
}
});
};
let events = [];
subscribe({
next: val => events.push( val ),
complete: () => assert.pass( 'The source should be exhausted (and complete).' )
})( source );
assert.deepEqual( events, [0, 1, 2, 3], 'The sink should pull the expected events.' );
assert.end();
});
test( "subscribe() should return a disposal function", assert => {
assert.plan( 2 );
const source = ( type, data ) => {
if ( type === 0 ) data( 0, source );
if ( type === 2 ) {
assert.pass( 'The source should receive a termination.' );
}
};
const dispose = subscribe({
next: val => val
})( source );
assert.equal( typeof dispose, 'function', 'The subscribe method should return a function.' );
dispose();
assert.end();
});
test("subscribe() should accept a function", assert => {
assert.plan( 1 );
const source = ( type, data ) => {
const iter = range( 0, 3 );
if ( type === 0 ) data( 0, ( t ) => {
if ( t === 1 ) {
const { done, value } = iter.next();
if ( done ) data( 2 );
else data( 1, value );
}
});
};
let events = [];
subscribe(val => events.push( val ))( source );
assert.deepEqual( events, [0, 1, 2, 3], 'The sink should pull the expected events.' );
assert.end();
});