From 7428262dcd8da85de0adca0ef82c57398cf411fc Mon Sep 17 00:00:00 2001
From: Fabian Mastenbroek <mail.fabianm@gmail.com>
Date: Mon, 29 Apr 2019 14:56:51 +0200
Subject: feat: Add testkit for testing behavior

This change adds a testkit for synchronously testking Behavior
implementations.
---
 .../odcsim/testkit/internal/TestInboxImpl.kt       | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 odcsim-testkit/src/main/kotlin/com/atlarge/odcsim/testkit/internal/TestInboxImpl.kt

(limited to 'odcsim-testkit/src/main/kotlin/com/atlarge/odcsim/testkit/internal/TestInboxImpl.kt')

diff --git a/odcsim-testkit/src/main/kotlin/com/atlarge/odcsim/testkit/internal/TestInboxImpl.kt b/odcsim-testkit/src/main/kotlin/com/atlarge/odcsim/testkit/internal/TestInboxImpl.kt
new file mode 100644
index 00000000..2f939eaa
--- /dev/null
+++ b/odcsim-testkit/src/main/kotlin/com/atlarge/odcsim/testkit/internal/TestInboxImpl.kt
@@ -0,0 +1,99 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 atlarge-research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.atlarge.odcsim.testkit.internal
+
+import com.atlarge.odcsim.ActorPath
+import com.atlarge.odcsim.ActorRef
+import com.atlarge.odcsim.Envelope
+import com.atlarge.odcsim.Instant
+import com.atlarge.odcsim.testkit.TestInbox
+import org.junit.jupiter.api.Assertions.assertEquals
+import java.util.PriorityQueue
+
+/**
+ * A helper class for testing messages sent to an [ActorRef].
+ *
+ * @param owner The owner of the inbox.
+ * @param path The path to the test inbox.
+ * @param T The shape of the messages the inbox accepts.
+ */
+internal class TestInboxImpl<T : Any>(private val owner: BehaviorTestKitImpl<*>, path: ActorPath) : TestInbox<T> {
+    /**
+     * The queue of received messages.
+     */
+    private val inbox = PriorityQueue<Envelope<T>>()
+
+    /**
+     * The identifier for the next message to be scheduled.
+     */
+    private var nextId: Long = 0
+
+    override val ref: ActorRef<T> = ActorRefImpl(path)
+
+    override val hasMessages: Boolean
+        get() = inbox.isNotEmpty()
+
+    override fun receiveEnvelope(): Envelope<T> = inbox.remove()
+
+    override fun receiveAll(): List<Envelope<T>> = inbox.toList().also { inbox.clear() }
+
+    override fun clear() = inbox.clear()
+
+    override fun expectMessage(expected: T) = assertEquals(expected, receiveMessage())
+
+    override fun expectMessage(expected: T, message: String) = assertEquals(expected, receiveMessage(), message)
+
+    internal inner class ActorRefImpl(override val path: ActorPath) : ActorRef<T> {
+        /**
+         * Send the specified message to the actor this reference is pointing to after the specified delay.
+         *
+         * @param msg The message to send.
+         * @param after The delay before the message is received.
+         */
+        fun send(msg: T, after: Instant) {
+            inbox.add(EnvelopeImpl(nextId++, owner.time + after, msg))
+        }
+    }
+
+    /**
+     * A wrapper around a message that has been scheduled for processing.
+     *
+     * @property id The identifier of the message to keep the priority queue stable.
+     * @property time The point in time to deliver the message.
+     * @property message The message to wrap.
+     */
+    private inner class EnvelopeImpl(val id: Long,
+                                     override val time: Instant,
+                                     override val message: T) : Envelope<T> {
+        override fun compareTo(other: Envelope<*>): Int {
+            val cmp = super.compareTo(other)
+            return if (cmp == 0 && other is EnvelopeImpl)
+                id.compareTo(other.id)
+            else
+                cmp
+        }
+    }
+
+}
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