fix tests by making tests a package instead of an application

tests/.gitignore

@@ -0,0 +1 @@
+.elm

tests/elm.json

@@ -1,26 +1,18 @@
 {
-    "type": "application",
-    "source-directories": [],
-    "elm-version": "0.19.1",
+    "type": "package",
+    "name": "elm/core-tests",
+    "summary": "Elm's standard libraries",
+    "license": "BSD-3-Clause",
+    "version": "1.0.5",
+    "elm-version": "0.19.0 <= v < 0.20.0",
+    "exposed-modules": [
+        "EmptyPlaceholderModule"
+    ],
     "dependencies": {
-        "direct": {
-            "elm/browser": "1.0.1",
-            "elm/core": "1.0.2",
-            "elm/html": "1.0.0"
-        },
-        "indirect": {
-            "elm/json": "1.1.2",
-            "elm/time": "1.0.0",
-            "elm/url": "1.0.0",
-            "elm/virtual-dom": "1.0.2"
-        }
+        "elm/core": "1.0.0 <= v < 2.0.0"
     },
     "test-dependencies": {
-        "direct": {
-            "elm-explorations/test": "1.2.1"
-        },
-        "indirect": {
-            "elm/random": "1.0.0"
-        }
+        "elm/json": "1.1.3 <= v < 2.0.0",
+        "elm-explorations/test": "1.2.2 <= v < 2.0.0"
     }
 }

tests/run-tests.sh

@@ -3,68 +3,42 @@
 set -o errexit;
 set -o nounset;
 
-#let the caller supply an ELM_TEST binary if desired
+# Let the caller supply an ELM_TEST binary if desired.
 if [ -z "${ELM_TEST:-}" ]; then
     ELM_TEST=elm-test;
 fi
 
-# since elm/core is treated specially by the compiler (it's always
+# Since elm/core is treated specially by the compiler (it's always
 # inserted as a dependency even when not declared explicitly), we use
 # a bit of a hack to make the tests run against the local source code
 # rather than the elm/core source fetched from package.elm-lang.org.
 
-# create a local directory where the compiler will look for the
+# Create a local directory where the compiler will look for the
 # elm/core source code:
 
 DIR="$(dirname $0)";
 
 cd "$DIR";
 
-export ELM_HOME="$(pwd)/.elm";
-
+export ELM_HOME="$PWD/.elm";
 rm -rf "$ELM_HOME" && mkdir -p "$ELM_HOME";
-
-# elm-test also puts some things in elm-stuff, start with a clean
-# slate there as well
-
 rm -rf elm-stuff;
 
-# now make an initial run of the tests to populate .elm and elm-stuff;
-# this will test against elm/core from package.elm-lang.org, so we
-# don't really care what the results are; we just need to force all
-# the *other* dependencies to be fetched and set up.
-
-echo "seeding framework for test dependencies ...";
-
-# '|| true' lets us ignore failures here and keep the script running.
-# useful when developing a fix for a bug that exists in the version of
-# elm/core hosted on package.elm-lang.org
-"${ELM_TEST}" tests/Main.elm --fuzz=1 > /dev/null || true;
-
-# clear out the copy of elm-core fetched by the above and replace it
-# with the local source code we want to actually test
-
-VERSION_DIR="$(ls ${ELM_HOME}/0.19.1/packages/elm/core/)"
-CORE_PACKAGE_DIR="${ELM_HOME}/0.19.1/packages/elm/core/$VERSION_DIR"
+# Create a link to the git package
+VERSION=$(node -e "console.log(require('../elm.json').version)")
+CORE_LINK="${ELM_HOME}/0.19.1/packages/elm/core/${VERSION}"
 CORE_GIT_DIR="$(dirname $PWD)"
-
 echo;
-echo "Linking $CORE_PACKAGE_DIR to $CORE_GIT_DIR"
+echo "Linking $CORE_LINK to $CORE_GIT_DIR"
 echo;
-
-rm -rf "$CORE_PACKAGE_DIR"
-ln -sv "$CORE_GIT_DIR" "$CORE_PACKAGE_DIR"
+mkdir -p "$(dirname $CORE_LINK)"
+ln -sv "${CORE_GIT_DIR}" "${CORE_LINK}"
 rm -vf "${CORE_GIT_DIR}"/*.dat "${CORE_GIT_DIR}"/doc*.json
 
-# we also need to clear out elm-test's elm-stuff dir, since otherwise
-# the compiler complains that its .dat files are out of sync
-
-rm -rf elm-stuff;
-
-# now we can run the tests against the symlinked source code for real
+# Now we can run the tests against the symlinked source code for real.
 
 echo;
 echo "running tests ...";
 echo;
 
-"${ELM_TEST}" tests/Main.elm "$@";
+"${ELM_TEST}" "$@";