diff --git a/package-lock.json b/package-lock.json
index b0e7246..efcb174 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,6 +20,36 @@
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+      "dev": true,
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+      }
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@@ -57,6 +87,12 @@
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@@ -78,11 +114,27 @@
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       "integrity": "sha1-ns5bWsqJopkyJC4Yv5M975h2zBc="
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@@ -91,11 +143,93 @@
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+          "dev": true,
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+          "dev": true
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+          "dev": true,
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+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
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@@ -104,6 +238,12 @@
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@@ -127,11 +267,41 @@
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+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
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+      "dev": true,
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@@ -141,6 +311,53 @@
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+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.16.3.tgz",
+      "integrity": "sha512-WtY7Fx5LiOnSYgF5eg/1T+GONaGmpvpPdCpSnYij+U2gDTL0UPfWrhDw7b2IYb+9NQJsYpCA0wOQvZfsd6YwRw==",
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@@ -161,6 +378,24 @@
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@@ -176,6 +411,24 @@
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@@ -184,6 +437,26 @@
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@@ -198,6 +471,33 @@
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@@ -208,16 +508,90 @@
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+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 112d2f2..80d1249 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,13 @@
   "main": "index.js",
   "author": "Drew Short <warrick@sothr.com>",
   "license": "MIT",
+  "scripts": {
+    "test": "mocha"
+  },
   "dependencies": {
     "matrix-js-sdk": "2.4.5"
+  },
+  "devDependencies": {
+    "mocha": "^6.2.2"
   }
 }
diff --git a/test/test.js b/test/test.js
new file mode 100644
index 0000000..ac789fb
--- /dev/null
+++ b/test/test.js
@@ -0,0 +1,9 @@
+let assert = require('assert');
+
+describe('Array', function() {
+  describe('#indexOf()', function() {
+    it('should return -1 when the value is not present', function() {
+      assert.equal([1, 2, 3].indexOf(4), -1);
+    });
+  });
+});
\ No newline at end of file