From f142be8c2afd1f19bdec183f1169639b7cd1a472 Mon Sep 17 00:00:00 2001
From: Fabian Mastenbroek <mail.fabianm@gmail.com>
Date: Fri, 10 Sep 2021 16:54:46 +0200
Subject: test(compute): Add test suite for fault injector

---
 .../simulator/failure/HostFaultInjectorTest.kt     | 111 +++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/failure/HostFaultInjectorTest.kt

diff --git a/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/failure/HostFaultInjectorTest.kt b/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/failure/HostFaultInjectorTest.kt
new file mode 100644
index 00000000..f240a25f
--- /dev/null
+++ b/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/failure/HostFaultInjectorTest.kt
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2021 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 org.opendc.compute.simulator.failure
+
+import io.mockk.coVerify
+import io.mockk.mockk
+import kotlinx.coroutines.delay
+import org.apache.commons.math3.distribution.LogNormalDistribution
+import org.apache.commons.math3.random.Well19937c
+import org.junit.jupiter.api.Test
+import org.opendc.compute.simulator.SimHost
+import org.opendc.simulator.core.runBlockingSimulation
+import java.time.Clock
+import java.time.Duration
+import kotlin.coroutines.CoroutineContext
+import kotlin.math.ln
+
+/**
+ * Test suite for [HostFaultInjector] class.
+ */
+internal class HostFaultInjectorTest {
+    /**
+     * Simple test case to test that nothing happens when the injector is not started.
+     */
+    @Test
+    fun testInjectorNotStarted() = runBlockingSimulation {
+        val host = mockk<SimHost>(relaxUnitFun = true)
+
+        val injector = createSimpleInjector(coroutineContext, clock, setOf(host))
+
+        coVerify(exactly = 0) { host.fail() }
+        coVerify(exactly = 0) { host.recover() }
+
+        injector.close()
+    }
+
+    /**
+     * Simple test case to test a start stop fault where the machine is stopped and started after some time.
+     */
+    @Test
+    fun testInjectorStopsMachine() = runBlockingSimulation {
+        val host = mockk<SimHost>(relaxUnitFun = true)
+
+        val injector = createSimpleInjector(coroutineContext, clock, setOf(host))
+
+        injector.start()
+
+        delay(Duration.ofDays(55).toMillis())
+
+        injector.close()
+
+        coVerify(exactly = 1) { host.fail() }
+        coVerify(exactly = 1) { host.recover() }
+    }
+
+    /**
+     * Simple test case to test a start stop fault where multiple machines are stopped.
+     */
+    @Test
+    fun testInjectorStopsMultipleMachines() = runBlockingSimulation {
+        val hosts = listOf<SimHost>(
+            mockk(relaxUnitFun = true),
+            mockk(relaxUnitFun = true)
+        )
+
+        val injector = createSimpleInjector(coroutineContext, clock, hosts.toSet())
+
+        injector.start()
+
+        delay(Duration.ofDays(55).toMillis())
+
+        injector.close()
+
+        coVerify(exactly = 1) { hosts[0].fail() }
+        coVerify(exactly = 1) { hosts[1].fail() }
+        coVerify(exactly = 1) { hosts[0].recover() }
+        coVerify(exactly = 1) { hosts[1].recover() }
+    }
+
+    /**
+     * Create a simple start stop fault injector.
+     */
+    private fun createSimpleInjector(context: CoroutineContext, clock: Clock, hosts: Set<SimHost>): HostFaultInjector {
+        val rng = Well19937c(0)
+        val iat = LogNormalDistribution(rng, ln(24 * 7.0), 1.03)
+        val selector = StochasticVictimSelector(LogNormalDistribution(rng, 1.88, 1.25))
+        val fault = StartStopHostFault(LogNormalDistribution(rng, 8.89, 2.71))
+
+        return HostFaultInjector(context, clock, hosts, iat, selector, fault)
+    }
+}
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