before/beforeEach/afterEach/after not run in correct order when using nested experiments

[krisb]

Consider the following test:

var Lab = require('lab');

Lab.experiment('calculator', function () {

    Lab.before(function (done) {
        console.log('called: before');

        done();
    });

    Lab.beforeEach(function (done) {
        console.log('called: beforeEach');

        done();
    });

    Lab.afterEach(function (done) {
        console.log('called: afterEach');

        done();
    });

    Lab.after(function (done) {
        console.log('called: after');

        done();
    });

    Lab.test('returns true when zero', function (done) {
        console.log('called: test');
        Lab.expect(0).to.equal(0);
        done();
    });

    Lab.experiment('addition', function () {

        Lab.test('returns true when 1 + 1 equals 2', function (done) {
            console.log('called: test');
            Lab.expect(1+1).to.equal(2);
            done();
        });

    });

    Lab.experiment('subtract', function () {

        Lab.test('returns true when 1 - 1 equals 0', function (done) {
            console.log('called: test');
            Lab.expect(1-1).to.equal(0);
            done();
        });

    });
});

Run with tap (lab examples/nested_experiments.js -r tap) and you get the following output:

1..3
called: before
called: beforeEach
called: test
ok 1 calculator returns true when zero
called: afterEach
called: after
called: test
ok 2 calculator addition returns true when 1 + 1 equals 2
called: test
ok 3 calculator subtract returns true when 1 - 1 equals 0
# tests 3
# pass 3
# fail 0

expected output should be:

1..3
called: before
called: beforeEach
called: test
ok 1 calculator returns true when zero
called: afterEach
called: beforeEach
called: test
ok 2 calculator addition returns true when 1 + 1 equals 2
called: afterEach
called: beforeEach
called: test
ok 3 calculator subtract returns true when 1 - 1 equals 0
called: afterEach
called: after
# tests 3
# pass 3
# fail 0

Note: I've used tap for the simplistic output - its not a symptom of that formatter, more so structure of the experiments built in index.js.

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