github: rework test environment

Author: changkun

.github/workflows/clipboard.yml

@@ -14,35 +14,45 @@ on:
 
 jobs:
   platform_test:
-
+    env:
+      DISPLAY: ':0.0'
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-
     steps:
-
-    - name: install xvfb libx11-dev
+    - name: Install and run dependencies (xvfb libx11-dev)
+      if: ${{ runner.os == 'Linux' }}
       run: |
         sudo apt update
         sudo apt install -y xvfb libx11-dev
-      if: ${{ runner.os == 'Linux' }}
+        Xvfb :0 -screen 0 1024x768x24 > /dev/null 2>&1 &
+        # Wait for Xvfb
+        MAX_ATTEMPTS=120 # About 60 seconds
+        COUNT=0
+        echo -n "Waiting for Xvfb to be ready..."
+        while ! xdpyinfo -display "${DISPLAY}" >/dev/null 2>&1; do
+          echo -n "."
+          sleep 0.50s
+          COUNT=$(( COUNT + 1 ))
+          if [ "${COUNT}" -ge "${MAX_ATTEMPTS}" ]; then
+            echo "  Gave up waiting for X server on ${DISPLAY}"
+            exit 1
+          fi
+        done
+        echo "Done - Xvfb is ready!"
 
     - uses: actions/checkout@v2
     - uses: actions/setup-go@v2
       with:
         stable: 'false'
-        go-version: '1.17.0'
+        go-version: '1.17.x'
 
-    - name: TestLinux
+    - name: Build
       run: |
-        Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
-        export DISPLAY=:99.0
-        sleep 5s
-        go test -v -covermode=atomic ./...
-      if: ${{ runner.os == 'Linux' }}
+        go build
 
-    - name: TestOthers
+    - name: Run Tests
       run: |
         go test -v -covermode=atomic ./...