===================================
Command invocation without argument
===================================

message()

---

(source_file
  (command_invocation
  (identifier)))

===============================================
Command invocation without argument with spaces
===============================================

message( )

---

(source_file
  (command_invocation
    (identifier)
    (seperation (space))
  )
)

================================================
Command invocation without argument with newline
================================================

message(

)

---

(source_file
  (command_invocation
    (identifier)
    (seperation 
      (line_ending (newline))
    )
  )
)

====================================
Command invocation with one argument
====================================

message(STATUS)

---

(source_file
  (command_invocation
    (identifier)
    (arguments
      (argument)
    )
  )
)

=====================================
Command invocation with two arguments
=====================================

message(STATUS Hello)

---

(source_file
  (command_invocation
    (identifier)
    (arguments
      (argument)
      (seperation (space))
      (argument)
    )
  )
)