Add regression tests for eval

tests/eval.err

@@ -0,0 +1,13 @@
+
+####################
+# Testing eval builtin
+fish: Unexpected end of string, expecting ')'
+(
+^
+
+fish: The expanded command was empty.
+""
+^
+
+####################
+# Testing eval with empty functions, blocks, and arguments

tests/eval.in

@@ -0,0 +1,33 @@
+logmsg "Testing eval builtin"
+
+# Regression test for issue #4443
+eval set -l previously_undefined foo
+echo $previously_undefined
+
+# Test redirection
+eval "echo you can\\'t see this 1>&2" 2>/dev/null
+
+# Test return statuses
+false; eval true; echo $status # 0
+false; eval false; echo $status # 1
+
+# Test return status in case of parsing error
+false; eval "("; echo $status # 1
+false; eval '""'; echo $status # 1
+
+function empty
+end
+
+# Regression tests for issue #5692
+logmsg "Testing eval with empty functions, blocks, and arguments"
+false; eval;
+echo blank eval: $status # 0
+
+false; eval "";
+echo empty arg eval: $status # 0
+
+false; eval empty;
+echo empty function eval $status # 0
+
+false; eval "begin; end;";
+echo empty block eval: $status # 0

tests/eval.out

@@ -0,0 +1,15 @@
+
+####################
+# Testing eval builtin
+foo
+0
+1
+1
+1
+
+####################
+# Testing eval with empty functions, blocks, and arguments
+blank eval: 0
+empty arg eval: 0
+empty function eval 0
+empty block eval: 0

tests/eval_scope.in

@@ -1,3 +0,0 @@
-# Regression test for issue #4443
-eval set -l previously_undefined foo
-echo $previously_undefined

tests/eval_scope.out

@@ -1 +0,0 @@
-foo