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diff --git a/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt b/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt
new file mode 100644
index 00000000..d9f5ee81
--- /dev/null
+++ b/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt
@@ -0,0 +1,186 @@
+/*
+ * 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.serverless.service
+
+import io.mockk.*
+import io.opentelemetry.api.metrics.MeterProvider
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertThrows
+import org.opendc.serverless.api.ServerlessFunction
+import org.opendc.serverless.service.deployer.FunctionDeployer
+import org.opendc.serverless.service.deployer.FunctionInstance
+import org.opendc.serverless.service.deployer.FunctionInstanceState
+import org.opendc.simulator.core.runBlockingSimulation
+import java.util.*
+
+/**
+ * Test suite for the [ServerlessService] implementation.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+internal class ServerlessServiceTest {
+
+    @Test
+    fun testClientState() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = assertDoesNotThrow { service.newClient() }
+        assertDoesNotThrow { client.close() }
+
+        assertThrows<IllegalStateException> { client.queryFunctions() }
+        assertThrows<IllegalStateException> { client.newFunction("test", 128) }
+        assertThrows<IllegalStateException> { client.invoke("test") }
+        assertThrows<IllegalStateException> { client.findFunction(UUID.randomUUID()) }
+        assertThrows<IllegalStateException> { client.findFunction("name") }
+    }
+
+    @Test
+    fun testClientInvokeUnknown() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertThrows<IllegalArgumentException> { client.invoke("test") }
+    }
+
+    @Test
+    fun testClientFunctionCreation() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        val function = client.newFunction("test", 128)
+
+        assertEquals("test", function.name)
+    }
+
+    @Test
+    fun testClientFunctionQuery() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertEquals(listOf(function), client.queryFunctions())
+    }
+
+    @Test
+    fun testClientFunctionFindById() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertNotNull(client.findFunction(function.uid))
+    }
+
+    @Test
+    fun testClientFunctionFindByName() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertNotNull(client.findFunction(function.name))
+    }
+
+    @Test
+    fun testClientFunctionDuplicateName() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        client.newFunction("test", 128)
+
+        assertThrows<IllegalArgumentException> { client.newFunction("test", 128) }
+    }
+
+    @Test
+    fun testClientFunctionDelete() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+        assertNotNull(client.findFunction(function.uid))
+        function.delete()
+        assertNull(client.findFunction(function.uid))
+
+        // Delete should be idempotent
+        function.delete()
+    }
+
+    @Test
+    fun testClientFunctionCannotInvokeDeleted() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+        assertNotNull(client.findFunction(function.uid))
+        function.delete()
+
+        assertThrows<IllegalStateException> { function.invoke() }
+    }
+
+    @Test
+    fun testClientFunctionInvoke() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val deployer = mockk<FunctionDeployer>()
+        val service = ServerlessService(coroutineContext, clock, meter, deployer, mockk())
+
+        every { deployer.deploy(any()) } answers {
+            object : FunctionInstance {
+                override val state: FunctionInstanceState = FunctionInstanceState.Idle
+                override val function: FunctionObject = it.invocation.args[0] as FunctionObject
+
+                override suspend fun invoke() {}
+
+                override fun close() {}
+            }
+        }
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+
+        function.invoke()
+    }
+}