add test for session cached on disk

features/session_cache.feature

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+Feature: Android support
+
+Scenario: Test Unhandled Android Exception with Session
+    When I run "SessionCacheScenario" with the defaults
+    Then I should receive no requests
+
+    When I force stop the "com.bugsnag.android.mazerunner" Android app
+    And I set environment variable "EVENT_TYPE" to "Wait"
+    And I start the "com.bugsnag.android.mazerunner" Android app using the "com.bugsnag.android.mazerunner.MainActivity" activity
+    Then I should receive a request
+
+    And the request is a valid for the session tracking API
+    And the payload field "sessions" is an array with 1 element
+    And the session "user.id" equals "123"
+    And the session "user.email" equals "user@example.com"
+    And the session "user.name" equals "Joe Bloggs"
+    And the session "id" is not null
+    And the session "startedAt" is not null

mazerunner/src/main/java/com/bugsnag/android/mazerunner/scenarios/SessionCacheScenario.kt

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+package com.bugsnag.android.mazerunner.scenarios
+
+import android.content.Context
+import com.bugsnag.android.Bugsnag
+import com.bugsnag.android.Configuration
+
+/**
+ * Sends a session which is cached on disk to Bugsnag, then sent on a separate launch.
+ */
+internal class SessionCacheScenario(config: Configuration,
+                                   context: Context) : Scenario(config, context) {
+
+    override fun run() {
+        super.run()
+        Bugsnag.setUser("123", "user@example.com", "Joe Bloggs")
+        Bugsnag.startSession()
+        disableSessionDelivery()
+    }
+
+}

mazerunner/src/main/java/com/bugsnag/android/mazerunner/scenarios/Wait.kt

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+package com.bugsnag.android.mazerunner.scenarios
+
+import android.content.Context
+import android.os.Handler
+import android.os.HandlerThread
+import com.bugsnag.android.Configuration
+import com.bugsnag.android.flushAllSessions
+
+internal class Wait(config: Configuration, context: Context) : Scenario(config, context) {
+
+    override fun run() {
+        super.run()
+        val thread = HandlerThread("HandlerThread")
+        thread.start()
+        Handler(thread.looper).post {
+            flushAllSessions()
+        }
+    }
+
+}