Merge nucleic/sleek-thistle-egret-fyej into dev

brush-shell/tests/cases/compat/builtins/exec.yaml

@@ -0,0 +1,51 @@
+name: "Builtins: exec"
+cases:
+  - name: "Exec an invalid path"
+    ignore_stderr: true
+    stdin: |
+      exec /some/nonexistent/path
+
+  - name: "Exec with no arguments"
+    stdin: |
+      pid=$$
+      exec
+      [[ "${pid}" == "$$" ]] || echo "PID changed"
+
+  - name: "Exec with no arguments and redirection for new fd"
+    stdin: |
+      exec 3>some-file.txt
+      echo "Hello, fd 3!" >&3
+
+  - name: "Exec with no arguments and redirection of stderr"
+    stdin: |
+      exec 2>/dev/null
+
+      # Do something that should display an error to stderr
+      source /non-existent
+
+  - name: "Exec with no arguments and redirection in a script"
+    test_files:
+      - path: "script.sh"
+        contents: |
+          exec 2>output-file.txt
+          echo hi >&2
+    args: ["./script.sh"]
+
+  - name: "Exec a command"
+    stdin: |
+      exec $0 -c 'echo "In child shell"'
+      echo "This is never reached"
+
+  - name: "exec without -c"
+    stdin: |
+      export myvar=value
+      exec $0 -c 'echo "myvar: ${myvar}"'
+
+  - name: "exec -c"
+    stdin: |
+      export myvar=value
+      exec -c $0 -c 'echo "myvar: ${myvar}"'
+
+  - name: "exec -a"
+    stdin: |
+      exec -a shellname $0 -c 'echo "0: $0"'