diff --git a/package-lock.json b/package-lock.json
index 64c6b67..711145b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -388,6 +388,12 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
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@@ -1367,6 +1373,20 @@
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       "dev": true
     },
+    "chai": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
+      "dev": true,
+      "requires": {
+        "assertion-error": "1.1.0",
+        "check-error": "1.0.2",
+        "deep-eql": "3.0.1",
+        "get-func-name": "2.0.0",
+        "pathval": "1.1.0",
+        "type-detect": "4.0.8"
+      }
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
@@ -1377,6 +1397,12 @@
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       }
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+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
@@ -1601,6 +1627,15 @@
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       "dev": true
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "4.0.8"
+      }
+    },
     "deep-extend": {
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       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -2667,6 +2702,12 @@
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       "integrity": "sha1-sM62zFFk3yoGEzjMNAqGFTlcUvw="
     },
+    "get-func-name": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
+      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
+      "dev": true
+    },
     "get-stream": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
@@ -5239,6 +5280,12 @@
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       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
     },
+    "pathval": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "dev": true
+    },
     "pause": {
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       "resolved": "https://registry.npmjs.org/pause/-/pause-0.0.1.tgz",
diff --git a/package.json b/package.json
index d2112c8..948e9fc 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "axios": "^0.18.0",
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.7.0",
+    "chai": "^4.2.0",
     "faker": "^4.1.0",
     "mocha": "^5.2.0",
     "node-mocks-http": "^1.7.3",