Restore example building

Author: aantron

.github/workflows/test.yml

@@ -47,49 +47,20 @@ jobs:
     - run: opam exec -- make test
       if: runner.os != 'Windows'
 
-    # # The tests require ppx_expect. The latest versions of it introduced changes
-    # # in the formatting of the output, and also require OCaml >= 4.10, which
-    # # makes testing on < 4.10 awkward. So, we skip tests on < 4.10.
-    # - shell: bash
-    #   run: |
-    #     set -e
-    #     set -x
-    #
-    #     WITH_TEST=--with-test
-    #     case ${{matrix.ocaml}} in
-    #       4.09.x) WITH_TEST=;;
-    #       4.08.x) WITH_TEST=;;
-    #     esac
-    #
-    #     # Tests on Windows are disabled because of a difference in ppx_expect
-    #     # output. See https://github.com/aantron/dream/pull/282.
-    #     case ${{runner.os}} in
-    #       Windows) WITH_TEST=;;
-    #     esac
-    #
-    #     OPAM=$(which opam || true)
-    #     if [ -z "$OPAM" ]
-    #     then
-    #       OPAM=D:\\cygwin\\wrapperbin\\opam.cmd
-    #     fi
-    #
-    #     $OPAM install --yes --deps-only $WITH_TEST ./dream-pure.opam ./dream-httpaf.opam ./dream.opam
-    #
-    #     if [ ! -z "$WITH_TEST" ]
-    #     then
-    #       $OPAM exec -- dune runtest
-    #
-    #       EXAMPLES=$(find example -maxdepth 1 -type d -not -name "w-mirage*" -not -name "r-tyxml" | grep -v "^example/0" | grep -v "^example$" | sort)
-    #       shopt -s nullglob
-    #
-    #       for EXAMPLE in $EXAMPLES
-    #       do
-    #         FILE=$(ls $EXAMPLE/*.ml $EXAMPLE/*.re $EXAMPLE/server/*.ml $EXAMPLE/server/*.re)
-    #         EXE=$(echo $FILE | sed 's/\..*$/.exe/g')
-    #         echo dune build $EXE
-    #         $OPAM exec -- dune build $EXE
-    #       done
-    #     fi
+    - name: Build examples
+      if: runner.os != 'Windows'
+      run: |
+        set -e
+        set -x
+          EXAMPLES=$(find example -maxdepth 1 -type d -not -name "w-mirage*" -not -name "r-tyxml" | grep -v "^example/0" | grep -v "^example$" | sort)
+          shopt -s nullglob
+          for EXAMPLE in $EXAMPLES
+          do
+            FILE=$(ls $EXAMPLE/*.ml $EXAMPLE/*.re $EXAMPLE/server/*.ml $EXAMPLE/server/*.re)
+            EXE=$(echo $FILE | sed 's/\..*$/.exe/g')
+            echo dune build $EXE
+            opam exec -- dune build $EXE
+          done
 
   quickstart:
     strategy: