CI: Install Hermes

.travis.yml

@@ -1,28 +1,30 @@
 ---
 language: node_js
 node_js:
-  - 10
-  - 11
+  # - 10
+  - 12
 dist: trusty
 sudo: false
 before_install:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
 env:
-  # Shells
-  - ESHOST_TARGET=chakra
+  # # Shells
+  # - ESHOST_TARGET=chakra
   - ESHOST_TARGET=engine262
-  - ESHOST_TARGET=jsshell
-  - ESHOST_TARGET=node
-  # Browsers
-  - ESHOST_TARGET=firefox
-  - ESHOST_TARGET=chrome
-  # - ESHOST_TARGET=remote ESHOST_REMOTE_BROWSERNAME=firefox
+  - ESHOST_TARGET=hermes
+  # - ESHOST_TARGET=jsshell
+  # - ESHOST_TARGET=node
+  # # Browsers
+  # - ESHOST_TARGET=firefox
+  # - ESHOST_TARGET=chrome
+  # # - ESHOST_TARGET=remote ESHOST_REMOTE_BROWSERNAME=firefox
 install: |
     # Shells
     export ESHOST_SKIP_CH=1
     export ESHOST_SKIP_D8=1
     export ESHOST_SKIP_ENGINE262=1
+    export ESHOST_SKIP_HERMES=1
     export ESHOST_SKIP_JSC=1
     export ESHOST_SKIP_JSSHELL=1
     export ESHOST_SKIP_NODE=1
@@ -48,6 +50,15 @@ install: |
       cd $TRAVIS_BUILD_DIR;
     }
 
+    function install_hermes {
+      export TMP=$(mktemp);
+      wget https://github.com/facebook/hermes/releases/download/v0.2.1/hermes-cli-linux-v0.2.1.tar.gz -O $TMP;
+      tar -xvf $TMP;
+      rm $TMP;
+      unset TMP;
+      export PATH=$PATH:$(pwd)/hermes;
+    }
+
     if [[ "$ESHOST_TARGET" == "node" ]]; then
       unset ESHOST_SKIP_NODE;
     elif [[ "$ESHOST_TARGET" == "engine262" ]]; then
@@ -57,6 +68,10 @@ install: |
       install_firefox;
       export PATH=$(pwd)/firefox:$PATH;
       unset ESHOST_SKIP_FIREFOX;
+    elif [[ "$ESHOST_TARGET" == "hermes" ]]; then
+      install_hermes;
+      export PATH=$PATH:$(pwd)/hermes;
+      unset ESHOST_SKIP_HERMES;
     elif [[ "$ESHOST_TARGET" == "jsshell" ]]; then
       export TMP=$(mktemp);
       wget https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/jsshell-linux-x86_64.zip -O $TMP;