Migrate internal workflow tests to shell scripts.

Using `node`/`yarn` commands _after_ loading the `volta-cli/action` is
very error prone, and leads to false information.

.github/workflows/CI.yml

@@ -6,6 +6,10 @@ on:
       - master
       - 'releases/*'
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}
@@ -33,15 +37,15 @@ jobs:
       with:
         volta-version: 0.6.3
 
-    - run: node tests/log-info.js
-    - run: node tests/check-version.js 'volta' '0.6.3'
+    - run: tests/log-info.sh
+    - run: tests/check-version.sh 'volta' '0.6.3'
     - run: volta install [email protected] [email protected]
     - run: which node
     - run: volta which node
-    - run: node tests/check-version.js 'node' 'v10.0.0'
+    - run: tests/check-version.sh 'node' 'v10.0.0'
     - run: which yarn
     - run: volta which yarn
-    - run: node tests/check-version.js 'yarn' '1.19.0'
+    - run: tests/check-version.sh 'yarn' '1.19.0'
 
 
   test-no-options:
@@ -58,15 +62,15 @@ jobs:
     - run: npm run build
     - uses: ./
 
-    - run: node tests/log-info.js
-    - run: node tests/check-version.js 'volta' 'current'
+    - run: tests/log-info.sh
+    - run: tests/check-version.sh 'volta' 'current'
     - run: volta install [email protected] [email protected]
     - run: which node
     - run: volta which node
-    - run: node tests/check-version.js 'node' 'v12.16.1'
+    - run: tests/check-version.sh 'node' 'v12.16.1'
     - run: which yarn
     - run: volta which yarn
-    - run: node tests/check-version.js 'yarn' '1.19.1'
+    - run: tests/check-version.sh 'yarn' '1.19.1'
 
   test-specific-volta:
     runs-on: ${{ matrix.os }}
@@ -84,15 +88,15 @@ jobs:
       with:
         volta-version: 0.7.0
 
-    - run: node tests/log-info.js
-    - run: node tests/check-version.js 'volta' '0.7.0'
+    - run: tests/log-info.sh
+    - run: tests/check-version.sh 'volta' '0.7.0'
     - run: volta install [email protected] [email protected]
     - run: which node
     - run: volta which node
-    - run: node tests/check-version.js 'node' 'v12.16.1'
+    - run: tests/check-version.sh 'node' 'v12.16.1'
     - run: which yarn
     - run: volta which yarn
-    - run: node tests/check-version.js 'yarn' '1.19.1'
+    - run: tests/check-version.sh 'yarn' '1.19.1'
 
   test-specified-node-yarn-overrides-pinned-versions:
     runs-on: ${{ matrix.os }}
@@ -120,14 +124,14 @@ jobs:
         node-version: 12.14.0
         yarn-version: 1.22.0
 
-    - run: node ./action/tests/log-info.js
-    - run: node ./action/tests/check-version.js 'volta' '0.7.1'
+    - run: tests/log-info.sh
+    - run: ./action/tests/check-version.sh 'volta' '0.7.1'
     - run: which node
     - run: volta which node
-    - run: node ./action/tests/check-version.js 'node' 'v12.14.0'
+    - run: ./action/tests/check-version.sh 'node' 'v12.14.0'
     - run: which yarn
     - run: volta which yarn
-    - run: node ./action/tests/check-version.js 'yarn' '1.22.0'
+    - run: ./action/tests/check-version.sh 'yarn' '1.22.0'
 
   test-specific-volta-node-yarn:
     runs-on: ${{ matrix.os }}
@@ -147,11 +151,11 @@ jobs:
         node-version: 12.0.0
         yarn-version: 1.22.0
 
-    - run: node tests/log-info.js
-    - run: node tests/check-version.js 'volta' '0.7.1'
+    - run: tests/log-info.sh
+    - run: tests/check-version.sh 'volta' '0.7.1'
     - run: which node
     - run: volta which node
-    - run: node tests/check-version.js 'node' 'v12.0.0'
+    - run: tests/check-version.sh 'node' 'v12.0.0'
     - run: which yarn
     - run: volta which yarn
-    - run: node tests/check-version.js 'yarn' '1.22.0'
+    - run: tests/check-version.sh 'yarn' '1.22.0'

tests/check-version.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# exit when any command fails
+set -e
+
+command=$1
+expectedVersion=$2
+
+if [[ "$expectedVersion" == "current" ]]; then
+  scriptPath="$(dirname "$BASH_SOURCE")/latest-version.js"
+  expectedVersion="$(curl --silent "https://volta.sh/latest-version")"
+fi
+
+actualVersion="$($command --version)"
+echo "Expected $expectedVersion; found $actualVersion"
+
+if [[ "$actualVersion" != "$expectedVersion" ]]; then
+  exit 1
+fi

tests/log-info.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# exit when any command fails
+set -e
+
+echo "Current PATH: $PATH"
+echo "Current VOLTA_HOME: $VOLTA_HOME"
+
+voltaBinContents="$(ls $VOLTA_HOME/bin)"
+echo "Current contents of $VOLTA_HOME\n$voltaBinContents"
+echo "Path to volta: $(which volta)"
+echo "Path to node: $(which node)"
+echo "Path to yarn: $(which yarn)"