Port parameter_expansion test to littlecheck

Just put it in expansion.fish.

tests/checks/expansion.fish

@@ -17,3 +17,46 @@ set aa AA
 set aaa AAA
 echo {$aa}a{1,2,3}(for a in 1 2 3; echo $a; end)
 #CHECK: AAa11 AAa21 AAa31 AAa12 AAa22 AAa32 AAa13 AAa23 AAa33
+
+# basic expansion test
+echo {}
+echo {apple}
+echo {apple,orange}
+#CHECK: {}
+#CHECK: {apple}
+#CHECK: apple orange
+
+# expansion tests with spaces
+echo {apple, orange}
+echo { apple, orange, banana }
+#CHECK: apple orange
+#CHECK: apple orange banana
+
+# expansion with spaces and cartesian products
+echo \'{ hello , world }\'
+#CHECK: 'hello' 'world'
+
+# expansion with escapes
+for phrase in {good\,,   beautiful ,morning}; echo -n "$phrase "; end | string trim;
+for phrase in {goodbye\,,\ cruel\ ,world\n}; echo -n $phrase; end;
+#CHECK: good, beautiful morning
+#CHECK: goodbye, cruel world
+
+# dual expansion cartesian product
+echo { alpha, beta }\ {lambda, gamma }, |  string replace -r ',$' ''
+#CHECK: alpha lambda, beta lambda, alpha gamma, beta gamma
+
+# expansion with subshells
+for name in { (echo Meg), (echo Jo) }
+	echo $name
+end
+#CHECK: Meg
+#CHECK: Jo
+
+# subshells with expansion
+for name in (for name in {Beth, Amy}; printf "$name\n"; end); printf "$name\n"; end
+#CHECK: Beth
+#CHECK: Amy
+
+echo {{a,b}}
+#CHECK: {a} {b}

tests/parameter_expansion.in

@@ -1,29 +0,0 @@
-# basic expansion test
-echo {}
-echo {apple}
-echo {apple,orange}
-
-# expansion tests with spaces
-echo {apple, orange}
-echo { apple, orange, banana }
-
-# expansion with spaces and cartesian products
-echo \'{ hello , world }\'
-
-# expansion with escapes
-for phrase in {good\,,   beautiful ,morning}; echo -n "$phrase "; end | string trim;
-for phrase in {goodbye\,,\ cruel\ ,world\n}; echo -n $phrase; end;
-
-# dual expansion cartesian product
-echo { alpha, beta }\ {lambda, gamma }, |  string replace -r ',$' ''
-
-# expansion with subshells
-for name in { (echo Meg), (echo Jo) }
-	echo $name
-end
-
-# subshells with expansion
-for name in (for name in {Beth, Amy}; printf "$name\n"; end); printf "$name\n"; end
-
-echo {{a,b}}
-# vim: set ft=fish:

tests/parameter_expansion.out

@@ -1,14 +0,0 @@
-{}
-{apple}
-apple orange
-apple orange
-apple orange banana
-'hello' 'world'
-good, beautiful morning
-goodbye, cruel world
-alpha lambda, beta lambda, alpha gamma, beta gamma
-Meg
-Jo
-Beth
-Amy
-{a} {b}