add more alias unit tests

A recent regression to the `alias` command points out the need for more
unit tests of its behavior. I also decided to use it as an opportunity
to normalize the output of just `alias` to list aliases.

share/functions/alias.fish

@@ -17,9 +17,11 @@ function alias --description 'Creates a function wrapping a command'
     if not set -q argv[1]
         # Print the known aliases.
         for func in (functions -n)
-            set -l output (functions $func | string match -r -- "function .* --description '(alias .*)'" | string split \n)
-            set -q output[2]
-            and echo $output[2]
+            set -l output (functions $func | string match -r -- "^function .* --description 'alias (.*)'")
+            if set -q output[2]
+                set output (string replace -r '^'$func'[= ]' '' -- $output[2])
+                echo alias $func (string escape -- $output[1])
+            end
         end
         return 0
     else if not set -q argv[2]

tests/alias.in

@@ -5,3 +5,10 @@ function foo
 end
 alias my_alias "foo; and echo foo ran"
 my_alias
+
+alias a-2='echo "hello there"'
+
+echo '# bare `alias` should list the aliases we have created and nothing else'
+# We have to exclude two aliases because they're an artifact of the unit test
+# framework and we can't predict the definition.
+alias | grep -Ev '^alias (fish_indent|fish_key_reader) '

tests/alias.out

@@ -1,2 +1,5 @@
 ran foo
 foo ran
+# bare `alias` should list the aliases we have created and nothing else
+alias a-2 'echo "hello there"'
+alias my_alias 'foo; and echo foo ran'

tests/test1.in

@@ -1,5 +1,5 @@
 #
-#Test aliases, loops, conditionals and some basic elements
+#Test function, loops, conditionals and some basic elements
 #
 
 for i in 1 2 #Comment on same line as command
@@ -30,7 +30,7 @@ for i in \
 end
 
 
-# Simple alias tests
+# Simple function tests
 
 function foo
     echo >../test/temp/fish_foo.txt $argv