Added test cases for cmd, which and asyncExec

Author: Napalys

javascript/ql/test/library-tests/frameworks/Shelljs/ShellJS.expected

@@ -56,6 +56,7 @@ test_FileSystemAccess
 | tst.js:60:1:60:41 | shelljs ... cement) |
 | tst.js:61:1:61:17 | shelljs.cat(file) |
 test_MissingFileSystemAccess
+| tst.js:65:15:65:18 | file |
 test_SystemCommandExecution
 | tst.js:14:1:14:27 | shelljs ... ts, cb) |
 | tst.js:60:1:60:51 | shelljs ... ec(cmd) |

javascript/ql/test/library-tests/frameworks/Shelljs/tst.js

@@ -59,3 +59,10 @@ shelljs.uniq(opts, file1, file2);
 
 shelljs.cat(file).sed(regex, replacement).exec(cmd);
 shelljs.cat(file).exec(cmd);
+
+shelljs.cmd(cmd, arg1, arg2, options);
+shelljs.cmd(cmd);
+shelljs.which(file);
+
+const shelljssync = require("async-shelljs");
+shelljssync.asyncExec(cmd, opts, cb);