diff --git a/.eslintrc.json b/.eslintrc.json
index 8c6a277..eb6c782 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -6,7 +6,7 @@
   },
   "extends": "eslint:recommended",
   "parserOptions": {
-    "ecmaVersion": 6,
+    "ecmaVersion": 8,
     "sourceType": "script"
   },
   "rules": {
diff --git a/index.js b/index.js
index 8ce4752..eb58ddd 100644
--- a/index.js
+++ b/index.js
@@ -74,6 +74,10 @@ module.exports = function (options, cb) {
       return taskRunner.runPromisified(params);
     })
     .then((taskDefinition) => {
+      if (taskDefinition.failures) {
+        throw new Error("ECS RunTask returned failure messages", { cause: taskDefinition.failures });
+      }
+
       const taskArn = taskDefinition.tasks[0].taskArn;
       const taskId = taskArn.substring(taskArn.lastIndexOf('/') + 1);
       const formatter = new FormatStream();
diff --git a/test/format-transform-stream.js b/test/format-transform-stream.js
index 95611df..a62de23 100644
--- a/test/format-transform-stream.js
+++ b/test/format-transform-stream.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const expect                = require('expect.js');
+const expect = require('expect.js');
 const FormatTransformStream = require('../lib/format-transform-stream');
 
 describe('FormatTransformStream', function() {
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..69e2b52
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,112 @@
+'use strict'
+
+const { mockClient } = require('aws-sdk-client-mock');
+const { ECS, DescribeTaskDefinitionCommand, RunTaskCommand } = require("@aws-sdk/client-ecs");
+const { CloudWatchLogs, GetLogEventsCommand } = require("@aws-sdk/client-cloudwatch-logs");
+const expect = require('expect.js');
+const { promisify } = require('node:util');
+const index = promisify(require('../index'));
+
+describe('index', function () {
+  let cwlMock;
+  let ecsMock;
+  beforeEach(() => {
+    cwlMock = mockClient(CloudWatchLogs);
+    ecsMock = mockClient(ECS);
+  });
+
+  it('should do the thing', async function () {
+    const options = {
+      taskDefinitionArn: 'task-definition.arn',
+      containerName: 'meow'
+    };
+
+    ecsMock.on(DescribeTaskDefinitionCommand).callsFake(async params => {
+      expect(params.taskDefinition).to.eql(options.taskDefinitionArn)
+
+      return {
+        taskDefinition: {
+          taskDefinitionArn: options.taskDefinitionArn,
+          containerDefinitions: [{
+            name: options.containerName,
+            logConfiguration: {
+              logDriver: 'awslogs',
+              options: { 'awslogs-group': '', 'awslogs-stream-prefix': '' },
+            }
+          }],
+        }
+      }
+    });
+
+    // thread the randon EOF through to kill the stream
+    let eofSet;
+    const eof = new Promise(r => {
+      eofSet = r;
+    })
+    ecsMock.on(RunTaskCommand).callsFake(async params => {
+      expect(params.taskDefinition).to.eql(options.taskDefinitionArn)
+
+      // Grab the `xxx` from ..."TASK FINISHED: $(echo -n xxx | base64),"...
+      eofSet(params.overrides.containerOverrides[0].command[2].split(' ')[9])
+
+      return {
+        tasks: [{
+          taskArn: ''
+        }]
+      }
+    });
+
+    cwlMock.on(GetLogEventsCommand).callsFake(async _params => {
+      return {
+        events: [{
+          timestamp: 1477346285562,
+          message: Buffer.from(await eof).toString('base64'),
+        }]
+      };
+    });
+
+    // if this returns without crashing we're gucci
+    return index(options);
+  });
+
+
+  it('should warn us when a task fails to launch', async function () {
+    const options = {
+      taskDefinitionArn: 'task-definition.arn',
+      containerName: 'meow'
+    };
+
+    ecsMock.on(DescribeTaskDefinitionCommand).callsFake(async params => {
+      expect(params.taskDefinition).to.eql(options.taskDefinitionArn)
+
+      return {
+        taskDefinition: {
+          taskDefinitionArn: options.taskDefinitionArn,
+          containerDefinitions: [{
+            name: options.containerName,
+            logConfiguration: {
+              logDriver: 'awslogs',
+              options: { 'awslogs-group': '', 'awslogs-stream-prefix': '' },
+            }
+          }],
+        }
+      }
+    });
+
+    const reason = 'ECS is haunted'
+    ecsMock.on(RunTaskCommand).callsFake(async params => {
+      expect(params.taskDefinition).to.eql(options.taskDefinitionArn)
+
+      return {
+        failures: [{ reason }]
+      }
+    });
+
+    try {
+      await index(options);
+      expect().fail("App should have thrown an error about ECS returning errors")
+    } catch (err) {
+      expect(err.cause[0].reason).to.eql(reason)
+    }
+  });
+});
diff --git a/test/log-stream.js b/test/log-stream.js
index f92c9eb..3261288 100644
--- a/test/log-stream.js
+++ b/test/log-stream.js
@@ -7,8 +7,10 @@ const LogsStream = require('../lib/log-stream');
 
 describe('LogStream', function () {
   this.timeout(5000);
-  const cwlMock = mockClient(CloudWatchLogs);
-  afterEach(() => { cwlMock.reset(); });
+  let cwlMock ;
+  beforeEach(() => {
+    cwlMock = mockClient(CloudWatchLogs);
+  });
 
   const options = {
     logGroup: 'yee',
diff --git a/test/taskrunner.js b/test/taskrunner.js
index 26f9ed0..5bfa70b 100644
--- a/test/taskrunner.js
+++ b/test/taskrunner.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { mockClient } = require('aws-sdk-client-mock');
-const { ECS, StartTaskCommand, StopTaskCommand, RunTaskCommand } = require("@aws-sdk/client-ecs");
+const { ECS, StopTaskCommand, RunTaskCommand } = require("@aws-sdk/client-ecs");
 const expect = require('expect.js');
 const taskRunner = require('../lib/taskrunner');
 
@@ -21,8 +21,10 @@ describe('TaskRunner', function () {
   })
 
   describe('#run', function () {
-    const ecsMock = mockClient(ECS);
-    afterEach(() => { ecsMock.reset(); });
+    let ecsMock;
+    beforeEach(() => {
+      ecsMock = mockClient(ECS);
+    });
 
     it('should make a call to AWS.ECS with correct arguments not including env', function (done) {
       const options = {
@@ -83,7 +85,7 @@ describe('TaskRunner', function () {
 
   describe('#stop', function () {
     const ecsMock = mockClient(ECS);
-    afterEach(() => { ecsMock.reset(); });
+    beforeEach(() => { ecsMock.reset(); });
 
     it('should make a call to AWS.ECS with correct arguments', function (done) {
       const options = {