Added findRubyVersion tests

lib/find-ruby.js

@@ -15,6 +15,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
     return result;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
 const exec = __importStar(require("@actions/exec"));
 const tc = __importStar(require("@actions/tool-cache"));
 const path = __importStar(require("path"));
@@ -33,6 +34,7 @@ function default_1(version) {
             const dest = '/usr/bin/ruby';
             exec.exec('sudo ln', ['-sf', path.join(toolPath, 'ruby'), dest]); // replace any existing
         }
+        core.addPath(toolPath);
     });
 }
 exports.default = default_1;