45451: builtins: kill: Add basic test suite

This is not totally comprehensive, but at least it's a start for the
core functionality. In the next commits, we'll also use this base to add
some regression tests.

ChangeLog

@@ -1,3 +1,7 @@
+2020-02-18  Chris Down  <chris@chrisdown.name>
+
+	* 45451: Test/B11kill.ztst: builtins: kill: Add basic test suite
+
 2020-02-17  brian m. carlson  <sandals@crustytoothpaste.net>
 
 	* github #48/0002:

Test/B11kill.ztst

@@ -0,0 +1,60 @@
+# Tests for the kill builtin.
+#
+# The exit codes 11 and 19 in this file don't mean anything special; they're
+# just exit codes which are specific enough that the failure of `kill` itself
+# can be differentiated from exiting due to executing a trap.
+
+%test
+
+# Correct invocation
+
+  if zmodload zsh/system &>/dev/null; then
+    (
+      trap 'exit 19' TERM
+      kill $sysparams[pid]
+    )
+  else
+    ZTST_skip='Cannot zmodload zsh/system, skipping kill with no sigspec'
+  fi
+19:kill with no sigspec
+
+
+  if zmodload zsh/system &>/dev/null; then
+    (
+      trap 'exit 11' USR1
+      kill -USR1 $sysparams[pid]
+    )
+  else
+    ZTST_skip='Cannot zmodload zsh/system, skipping kill with sigspec'
+  fi
+11:kill with sigspec
+
+# Incorrect invocation
+
+  (
+    kill a b c
+  )
+3:kill with multiple wrong inputs should increment status
+?(eval):kill:2: illegal pid: a
+?(eval):kill:2: illegal pid: b
+?(eval):kill:2: illegal pid: c
+
+  (
+    kill -INT a b c
+  )
+3:kill with sigspec and wrong inputs should increment status
+?(eval):kill:2: illegal pid: a
+?(eval):kill:2: illegal pid: b
+?(eval):kill:2: illegal pid: c
+
+  (
+    kill
+  )
+1:kill with no arguments
+?(eval):kill:2: not enough arguments
+
+  (
+    kill -INT
+  )
+1:kill with sigspec only
+?(eval):kill:2: not enough arguments