Update Flush policies (#256)

* change visiblity and add unit test

* fix: fix interval policy test

* update tests

* update tests

---------

Co-authored-by: Niall Brennan <niall.brennan@segment.com>
Co-authored-by: Alan Charles <acharles@twilio.com>

Author: 3 people

Sources/Segment/Utilities/Policies/CountBasedFlushPolicy.swift

@@ -12,9 +12,9 @@ public class CountBasedFlushPolicy: FlushPolicy {
     internal var desiredCount: Int?
     @Atomic internal var count: Int = 0
 
-    init() { }
+    public init() { }
 
-    init(count: Int) {
+    public init(count: Int) {
         desiredCount = count
     }
 

Sources/Segment/Utilities/Policies/IntervalBasedFlushPolicy.swift

@@ -15,9 +15,9 @@ public class IntervalBasedFlushPolicy: FlushPolicy,
     internal var desiredInterval: TimeInterval?
     internal var flushTimer: QueueTimer? = nil
 
-    init() { }
+    public init() { }
 
-    init(interval: TimeInterval) {
+    public init(interval: TimeInterval) {
         desiredInterval = interval
     }
 

Tests/Segment-Tests/FlushPolicy_Tests.swift

@@ -119,4 +119,27 @@ class FlushPolicyTests: XCTestCase {
         // we now have ONE HA HA.  TWO HA HA .. 3 ... HA HA THREE!  Items to flush!  <flys aways>
         XCTAssertTrue(countFlush.shouldFlush())
     }
+
+    func testIntervalBasedFlushPolicy() throws {
+        let analytics = Analytics(configuration: Configuration(writeKey: "intervalFlushPolicy"))
+        
+        //remove default flush policies
+        analytics.removeAllFlushPolicies()
+        
+        // make sure storage has no old events
+        analytics.storage.hardReset(doYouKnowHowToUseThis: true)
+        
+        let intervalFlush = IntervalBasedFlushPolicy(interval: 2)
+        analytics.add(flushPolicy: intervalFlush)
+        
+        waitUntilStarted(analytics: analytics)
+        analytics.track(name: "blah", properties: nil)
+        
+        XCTAssertTrue(analytics.hasUnsentEvents)
+        
+        // sleep for 4 seconds for 2 second flush policy
+        RunLoop.main.run(until: Date.init(timeIntervalSinceNow: 4))
+        
+        XCTAssertFalse(analytics.hasUnsentEvents)
+    }
 }