feat: add unit tests in event bridge module (#28)

event-bridge/build.gradle

@@ -6,4 +6,11 @@ plugins {
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8
-}
+}
+test {
+    useJUnitPlatform()
+}
+dependencies {
+    testImplementation platform("org.junit:junit-bom:5.7.2")
+    testImplementation "org.junit.jupiter:junit-jupiter"
+}

event-bridge/src/main/java/com/amplitude/eventbridge/EventBridge.kt

@@ -18,6 +18,9 @@ interface EventReceiver {
     fun receive(channel: EventChannel, event: Event)
 }
 
+/**
+ * Bridges to transfer data between modules, like analytics and experiment
+ */
 interface EventBridge {
     fun sendEvent(channel: EventChannel, event: Event)
     fun setEventReceiver(channel: EventChannel, receiver: EventReceiver)

event-bridge/src/main/java/com/amplitude/eventbridge/EventBridgeContainer.kt

@@ -1,5 +1,8 @@
 package com.amplitude.eventbridge
 
+/**
+ * Container of EventBridge
+ */
 class EventBridgeContainer {
 
     companion object {

event-bridge/src/test/kotlin/com/amplitude/eventbridge/EventBridgeContainerTest.kt

@@ -0,0 +1,16 @@
+package com.amplitude.eventbridge
+
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class EventBridgeContainerTest {
+
+    @Test
+    fun `test getInstance return same instance for certain name`() {
+        val eventBridge1 = EventBridgeContainer.getInstance("testInstance")
+        val eventBridge2 = EventBridgeContainer.getInstance("testInstance")
+        Assertions.assertEquals(eventBridge1, eventBridge2)
+    }
+}

event-bridge/src/test/kotlin/com/amplitude/eventbridge/EventBridgeTest.kt

@@ -0,0 +1,60 @@
+package com.amplitude.eventbridge
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class EventBridgeTest {
+
+    @Test
+    fun `test addEventListener, sendEvent, listener called`() {
+        val testEvent = Event("test")
+        val identifyEvent = Event("identify")
+        val eventBridge = EventBridgeImpl()
+        var wasEventReceiverCalled = false
+        eventBridge.setEventReceiver(
+            EventChannel.EVENT,
+            object : EventReceiver {
+                override fun receive(channel: EventChannel, event: Event) {
+                    assertEquals(event, testEvent)
+                    wasEventReceiverCalled = true
+                }
+            }
+        )
+        eventBridge.setEventReceiver(
+            EventChannel.IDENTIFY,
+            object : EventReceiver {
+                override fun receive(channel: EventChannel, event: Event) {
+                    assertEquals(event, identifyEvent)
+                    wasEventReceiverCalled = true
+                }
+            }
+        )
+        eventBridge.sendEvent(EventChannel.EVENT, testEvent)
+        eventBridge.sendEvent(EventChannel.IDENTIFY, identifyEvent)
+        assertTrue(wasEventReceiverCalled)
+    }
+
+    @Test
+    fun `test sendEvent first, add listener later and listener receive event`() {
+        val testEvent1 = Event("test1")
+        val testEvent2 = Event("test2")
+        val testEvent3 = Event("test3")
+        val eventBridge = EventBridgeImpl()
+        eventBridge.sendEvent(EventChannel.EVENT, testEvent1)
+        eventBridge.sendEvent(EventChannel.EVENT, testEvent2)
+        eventBridge.sendEvent(EventChannel.EVENT, testEvent3)
+        var eventCount = 0
+        eventBridge.setEventReceiver(
+            EventChannel.EVENT,
+            object : EventReceiver {
+                override fun receive(channel: EventChannel, event: Event) {
+                    eventCount++
+                }
+            }
+        )
+        assertEquals(3, eventCount)
+    }
+}