fix tests by using elm-test-rs

the node test runner does not like the hacks we do in
./tests/run-tests.sh. However elm-test-rs does not mind, it seems easier
to switch test runner than to update the hacks for the node test runner.

As an added extra we migrate CI from travis to github actions.

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+
+jobs:
+  main:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node-version: [14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "${{ matrix.node-version }}"
+
+      - name: Cache node_modules
+        id: cache-node_modules
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          key: node_modules-${{ matrix.os }}-${{ matrix.node-version }}-${{ hashFiles('package-lock.json') }}
+
+      - name: Cache ELM_HOME
+        uses: actions/cache@v2
+        with:
+          path: '${{ env.ELM_HOME }}'
+          key: elm-${{ matrix.os }}-${{ hashFiles('elm-tooling.json', 'elm/**/elm.json', 'example-*/**/elm.json', 'tests/**/elm.json') }}
+
+      - name: Install elm-tooling CLI
+        if: steps.cache-node_modules.outputs.cache-hit != 'true'
+        run: npm install --no-save elm-tooling
+
+      - name: elm-tooling install
+        run: npx --no-install elm-tooling install
+
+      - name: test
+        run: npx -c ./tests/run-tests.sh

elm-tooling.json

@@ -0,0 +1,6 @@
+{
+    "tools": {
+        "elm": "0.19.1",
+        "elm-test-rs": "1.0.0"
+    }
+}

tests/run-tests.sh

@@ -5,7 +5,7 @@ set -o nounset;
 
 #let the caller supply an ELM_TEST binary if desired
 if [ -z "${ELM_TEST:-}" ]; then
-    ELM_TEST=elm-test;
+    ELM_TEST=elm-test-rs
 fi
 
 # since elm/core is treated specially by the compiler (it's always

tests/tests/Main.elm

@@ -5,7 +5,6 @@ import Task exposing (..)
 import Test exposing (..)
 import Platform.Cmd exposing (Cmd)
 import Json.Decode exposing (Value)
-import Test.Runner.Node exposing (run, TestProgram)
 import Test.Array as Array
 import Test.Basics as Basics
 import Test.Bitwise as Bitwise