saving $IFS in run() not altered for code using it

IFS was modified by run() becoming '\n' and so relying to its bash default
was failing tests.

Also some wrong tests corrected because was relying on this behavior to pass.

Fix #89

test/bats.bats

@@ -37,7 +37,7 @@ fixtures bats
   run bats "$FIXTURE_ROOT/passing.bats"
   [ $status -eq 0 ]
   [ ${lines[0]} = "1..1" ]
-  [ ${lines[1]} = "ok 1 a passing test" ]
+  [ "${lines[1]}" = "ok 1 a passing test" ]
 }
 
 @test "summary passing tests" {
@@ -256,3 +256,9 @@ fixtures bats
   [ "${lines[5]}" =  "# (in test file $RELATIVE_FIXTURE_ROOT/single_line.bats, line 9)" ]
   [ "${lines[6]}" = $'#   `@test "failing" { false; }\' failed' ]
 }
+
+@test "testing IFS not modified by run" {
+  run bats "$FIXTURE_ROOT/loop_keep_IFS.bats"
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "ok 1 loop_func" ]
+}

test/fixtures/bats/loop_keep_IFS.bats

@@ -0,0 +1,16 @@
+# see issue #89
+loop_func() {
+  local search="none one two tree"
+  local d
+
+  for d in $search ; do
+    echo $d
+  done
+}
+
+@test "loop_func" {
+  run loop_func
+  [[ "${lines[3]}" == 'tree' ]]
+  run loop_func
+  [[ "${lines[2]}" == 'two' ]]
+}

test/suite.bats

@@ -13,7 +13,7 @@ fixtures suite
   run bats "$FIXTURE_ROOT/single"
   [ $status -eq 0 ]
   [ ${lines[0]} = "1..1" ]
-  [ ${lines[1]} = "ok 1 a passing test" ]
+  [ "${lines[1]}" = "ok 1 a passing test" ]
 }
 
 @test "counting tests in a suite" {