BUG FIXED! See All Data Custom Setting Tests

SeeAllDataCustomSetting__c.object

<?xml version="1.0" encoding="UTF-8"?>
<CustomObject xmlns="http://soap.sforce.com/2006/04/metadata">
    <customSettingsType>List</customSettingsType>
    <customSettingsVisibility>Public</customSettingsVisibility>
    <enableFeeds>false</enableFeeds>
    <label>See All Data Custom Setting</label>
</CustomObject>

SeeAllDataCustomSettingTests.cls

@isTest class SeeAllDataCustomSettingTests {
    @isTest (SeeAllData=true) static void trueSeeAllDataCustomSettingTest() {
        final SeeAllDataCustomSetting__c seeAllDataCustomSetting = new SeeAllDataCustomSetting__c(Name = 'Name');

        System.assertEquals(0, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        System.assertEquals(0, SeeAllDataCustomSetting__c.getAll().size());
        insert seeAllDataCustomSetting;
        System.assertEquals(1, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        System.assertEquals(1, SeeAllDataCustomSetting__c.getAll().size());
        delete seeAllDataCustomSetting;
        System.assertEquals(0, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        System.assertEquals(0, SeeAllDataCustomSetting__c.getAll().size());
    }

    @isTest (SeeAllData=false) static void falseSeeAllDataCustomSettingTest() {
        final SeeAllDataCustomSetting__c seeAllDataCustomSetting = new SeeAllDataCustomSetting__c(Name = 'Name');

        System.assertEquals(0, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        System.assertEquals(0, SeeAllDataCustomSetting__c.getAll().size());
        insert seeAllDataCustomSetting;
        System.assertEquals(1, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        System.assertEquals(1, SeeAllDataCustomSetting__c.getAll().size());
        delete seeAllDataCustomSetting;
        System.assertEquals(0, [SELECT COUNT() FROM SeeAllDataCustomSetting__c]);
        // FIXED! BUG: Custom Settings not being flushed from application cache on delete when (SeeAllData=false)
        System.assertEquals(0, SeeAllDataCustomSetting__c.getAll().size());
    }
}