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var R = require('../source');var eq = require('./shared/eq');

describe('eqBy', function() {
  it('determines whether two values map to the same value in the codomain', function() {    eq(R.eqBy(Math.abs, 5, 5), true);    eq(R.eqBy(Math.abs, 5, -5), true);    eq(R.eqBy(Math.abs, -5, 5), true);    eq(R.eqBy(Math.abs, -5, -5), true);    eq(R.eqBy(Math.abs, 42, 99), false);  });
  it('has R.equals semantics', function() {    function Just(x) { this.value = x; }    Just.prototype.equals = function(x) {      return x instanceof Just && R.equals(x.value, this.value);    };
    eq(R.eqBy(R.identity, 0, -0), false);    eq(R.eqBy(R.identity, -0, 0), false);    eq(R.eqBy(R.identity, NaN, NaN), true);    eq(R.eqBy(R.identity, new Just([42]), new Just([42])), true);  });
});