diff --git a/.gitignore b/.gitignore
index 1ee943a..f8ed99a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ elm-stuff
 CHECKLIST
 build.js
 node_modules
+build
diff --git a/bin/build.sh b/bin/build.sh
index 98eca95..e7d2b4d 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -33,32 +33,30 @@ fi
 declare -i TEST_RESULT=0
 FAILED_EXERCISES=''
 
+mkdir -p build/tests
+
 for example_file in exercises/**/*.example.elm
 do
   # clean up generated code from last run
-  rm -rf tests/elm-stuff/generated-code/
+  rm -rf build/tests/elm-stuff/generated-code/
 
   exercise_dir=$(dirname $example_file)
   exercise_name=$(basename $example_file .example.elm)
-  mv "$exercise_dir/$exercise_name.elm" "$exercise_dir/$exercise_name.impl"
-  mv "$exercise_dir/$exercise_name.example.elm" "$exercise_dir/$exercise_name.elm"
+  cp "$exercise_dir/$exercise_name.example.elm" "build/$exercise_name.elm"
+  cp "$exercise_dir/tests/elm-package.json" build/tests/
+  cp "$exercise_dir/tests/Tests.elm" build/tests/
+
   echo '-------------------------------------------------------'
   echo "Testing $exercise_name"
 
-  cp "$exercise_dir/tests/Tests.elm" tests/
 
-  npm test -- tests/Tests.elm
+  npm test -- build/tests/Tests.elm
 
   # capture result from last command (elm-test)
   if [ $? -ne 0 ]; then
       TEST_RESULT=1
       FAILED_EXERCISES+="$exercise_name\n"
   fi
-
-  # be kind, rewind
-  mv "$exercise_dir/$exercise_name.elm" "$exercise_dir/$exercise_name.example.elm"
-  mv "$exercise_dir/$exercise_name.impl" "$exercise_dir/$exercise_name.elm"
-  rm tests/Tests.elm
 done
 
 if [ $TEST_RESULT -ne 0 ]; then
diff --git a/elm-package.json b/elm-package.json
deleted file mode 100644
index 25056b9..0000000
--- a/elm-package.json
+++ /dev/null
@@ -1,44 +0,0 @@
-{
-    "version": "3.0.0",
-    "summary": "Exercism problems in Elm.",
-    "repository": "https://github.com/exercism/xelm.git",
-    "license": "BSD3",
-    "source-directories": [
-        ".",
-        "./exercises/hello-world",
-        "./exercises/leap",
-        "./exercises/pangram",
-        "./exercises/rna-transcription",
-        "./exercises/hamming",
-        "./exercises/word-count",
-        "./exercises/bob",
-        "./exercises/run-length-encoding",
-        "./exercises/difference-of-squares",
-        "./exercises/anagram",
-        "./exercises/raindrops",
-        "./exercises/triangle",
-        "./exercises/scrabble-score",
-        "./exercises/accumulate",
-        "./exercises/sublist",
-        "./exercises/sum-of-multiples",
-        "./exercises/strain",
-        "./exercises/space-age",
-        "./exercises/nucleotide-count",
-        "./exercises/series",
-        "./exercises/phone-number",
-        "./exercises/grade-school",
-        "./exercises/allergies",
-        "./exercises/robot-simulator",
-        "./exercises/list-ops",
-        "./exercises/atbash-cipher",
-        "./exercises/say",
-        "./exercises/largest-series-product",
-        "./exercises/roman-numerals",
-        "./exercises/gigasecond"
-    ],
-    "exposed-modules": [],
-    "dependencies": {
-        "elm-lang/core": "5.0.0 <= v < 6.0.0"
-    },
-    "elm-version": "0.18.0 <= v < 0.19.0"
-}
diff --git a/tests/elm-package.json b/tests/elm-package.json
deleted file mode 100644
index abf69f5..0000000
--- a/tests/elm-package.json
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-    "version": "3.0.0",
-    "summary": "Exercism problems in Elm.",
-    "repository": "https://github.com/exercism/xelm.git",
-    "license": "BSD3",
-    "source-directories": [
-        ".",
-        "../exercises/hello-world",
-        "../exercises/leap",
-        "../exercises/pangram",
-        "../exercises/rna-transcription",
-        "../exercises/hamming",
-        "../exercises/word-count",
-        "../exercises/bob",
-        "../exercises/run-length-encoding",
-        "../exercises/difference-of-squares",
-        "../exercises/anagram",
-        "../exercises/raindrops",
-        "../exercises/triangle",
-        "../exercises/scrabble-score",
-        "../exercises/accumulate",
-        "../exercises/sublist",
-        "../exercises/sum-of-multiples",
-        "../exercises/strain",
-        "../exercises/space-age",
-        "../exercises/nucleotide-count",
-        "../exercises/series",
-        "../exercises/phone-number",
-        "../exercises/grade-school",
-        "../exercises/allergies",
-        "../exercises/robot-simulator",
-        "../exercises/list-ops",
-        "../exercises/atbash-cipher",
-        "../exercises/say",
-        "../exercises/largest-series-product",
-        "../exercises/roman-numerals",
-        "../exercises/gigasecond"
-    ],
-    "exposed-modules": [],
-    "dependencies": {
-        "elm-lang/core": "5.0.0 <= v < 6.0.0",
-        "elm-community/elm-test": "4.0.0 <= v < 5.0.0"
-    },
-    "elm-version": "0.18.0 <= v < 0.19.0"
-}