Add pexpect test for status current-commandline

tests/pexpects/status.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+from pexpect_helper import SpawnedProc
+import os
+import platform
+import sys
+
+sp = SpawnedProc()
+send, sendline, sleep, expect_prompt, expect_re, expect_str = (
+    sp.send,
+    sp.sendline,
+    sp.sleep,
+    sp.expect_prompt,
+    sp.expect_re,
+    sp.expect_str,
+)
+expect_prompt()
+
+# Fish should start in default-mode (i.e., emacs) bindings. The default escape
+# timeout is 30ms.
+#
+# Because common CI systems are awful, we have to increase this:
+
+sendline("set -g fish_escape_delay_ms 120")
+expect_prompt("")
+
+# Validate standalone behavior
+sendline("status current-commandline")
+expect_prompt("\r\nstatus current-commandline\r\n")
+
+# Validate behavior as part of a command chain
+sendline("true 7 && status current-commandline");
+expect_prompt("\r\ntrue 7 && status current-commandline\r\n");
+
+# Validate behavior when used in a function
+sendline("function report; set -g last_cmdline (status current-commandline); end");
+expect_prompt("")
+sendline("report 27")
+expect_prompt("")
+sendline("echo $last_cmdline")
+expect_prompt("\r\nreport 27\r\n")
+
+# Exit
+send("\x04") # <c-d>
+expect_str("")