Snapshot tests

chapter09/package-lock.json

@@ -11536,6 +11536,12 @@
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       "dev": true
     },
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+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.14.2.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/pretty-bytes/-/pretty-bytes-4.0.2.tgz",
@@ -11920,6 +11926,12 @@
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       "dev": true
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+    "react-is": {
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+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.4.2.tgz",
+      "integrity": "sha512-rI3cGFj/obHbBz156PvErrS5xc6f1eWyTwyV4mo0vF2lGgXgS+mm7EKD5buLJq6jNgIagQescGSVG2YzgXt8Yg==",
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+    },
     "react-loadable": {
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       "resolved": "https://registry.npmjs.org/react-loadable/-/react-loadable-5.4.0.tgz",
@@ -12270,6 +12282,18 @@
         }
       }
     },
+    "react-test-renderer": {
+      "version": "16.4.2",
+      "resolved": "https://registry.npmjs.org/react-test-renderer/-/react-test-renderer-16.4.2.tgz",
+      "integrity": "sha512-vdTPnRMDbxfv4wL4lzN4EkVGXyYs7LE2uImOsqh1FKiP6L5o1oJl8nore5sFi9vxrP9PK3l4rgb/fZ4PVUaWSA==",
+      "dev": true,
+      "requires": {
+        "fbjs": "^0.8.16",
+        "object-assign": "^4.1.1",
+        "prop-types": "^15.6.0",
+        "react-is": "^16.4.2"
+      }
+    },
     "read-pkg": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",