diff --git a/part7/test/Tests.elm b/part7/test/Tests.elm
index 14151ae..38c3556 100644
--- a/part7/test/Tests.elm
+++ b/part7/test/Tests.elm
@@ -45,5 +45,5 @@ all =
            in
             assertEqual
               True
-              (isError (decodeString responseDecoder response))
+              (isErrorResult (decodeString responseDecoder response))
     ]
diff --git a/part8/README.md b/part8/README.md
index cf0b13e..3c4517b 100644
--- a/part8/README.md
+++ b/part8/README.md
@@ -1,4 +1,4 @@
-Part 7
+Part 8
 ======
 
 ## Installation
@@ -16,3 +16,10 @@ to fail; in that case, just run `elm package install` again.)
 elm live Main.elm --open -- --output=elm.js
 ```
 
+## Running Tests
+
+```bash
+cd test
+elm package install
+elm test TestRunner.elm
+```
diff --git a/part8/test/Tests.elm b/part8/test/Tests.elm
index 7c06fe2..e2358c7 100644
--- a/part8/test/Tests.elm
+++ b/part8/test/Tests.elm
@@ -32,4 +32,20 @@ all =
                 , { id = 3, name = "bar", stars = 77 }
                 ]
               )
+    , test "they result in an error for invalid JSON"
+        <| let
+            response =
+              """{ "pizza": [] }"""
+
+            isErrorResult result =
+              case result of
+                Ok _ ->
+                  False
+
+                Err _ ->
+                  True
+           in
+            assertEqual
+              True
+              (isErrorResult (decodeString responseDecoder response))
     ]
diff --git a/part8/test/elm-package.json b/part8/test/elm-package.json
index a440485..8a04845 100644
--- a/part8/test/elm-package.json
+++ b/part8/test/elm-package.json
@@ -10,6 +10,7 @@
     "exposed-modules": [],
     "dependencies": {
         "deadfoxygrandpa/elm-test": "3.1.1 <= v < 4.0.0",
+        "NoRedInk/elm-decode-pipeline": "1.0.0 <= v < 2.0.0",
         "elm-lang/core": "3.0.0 <= v < 4.0.0",
         "evancz/elm-effects": "2.0.0 <= v < 3.0.0",
         "evancz/elm-html": "4.0.0 <= v < 5.0.0",