diff --git a/lib/layout-helpers.sh b/lib/layout-helpers.sh
index dfa2673..dbbcb9a 100644
--- a/lib/layout-helpers.sh
+++ b/lib/layout-helpers.sh
@@ -18,13 +18,11 @@ tmux() {
 #   - $2: (optional) Shell command to execute when window is created.
 #
 new_window() {
-  if [ -n "$1" ]; then
-    window="$1"
-    local winarg=(-n "$window")
-  fi
+  if [ -n "$1" ]; then local winarg=(-n "$1"); fi
   if [ -n "$2" ]; then local command=("$2"); fi
 
   tmuxifier-tmux new-window -t "$session:" "${winarg[@]}" "${command[@]}"
+  window="$(__get_current_window_index)"
   __go_to_window_or_session_path
 }
 
@@ -91,6 +89,7 @@ clock() {
 #
 select_window() {
   tmuxifier-tmux select-window -t "$session:$1"
+  window="$(__get_current_window_index)"
 }
 
 # Select a specific pane in the current window.
diff --git a/test/lib/layout-helpers/new_window.test.sh b/test/lib/layout-helpers/new_window.test.sh
index 5b162b7..4817ce2 100755
--- a/test/lib/layout-helpers/new_window.test.sh
+++ b/test/lib/layout-helpers/new_window.test.sh
@@ -39,9 +39,20 @@ restore __go_to_window_or_session_path
 kill-test-session
 rm "/tmp/tmuxifier-new_window-test" &> /dev/null
 
-
-# Tear down.
-kill-test-server
+# When called ensure it sets the $window variable to the index of the newly
+# created window.
+unset window
+create-test-session
+stub __go_to_window_or_session_path
+new_window "foo"
+assert "echo $window" "1"
+new_window
+assert "echo $window" "2"
+new_window "bar"
+assert "echo $window" "3"
+restore __go_to_window_or_session_path
+kill-test-session
+unset window
 
 # End of tests.
 assert_end "new_window()"
diff --git a/test/lib/layout-helpers/select_window.test.sh b/test/lib/layout-helpers/select_window.test.sh
new file mode 100755
index 0000000..0ba4977
--- /dev/null
+++ b/test/lib/layout-helpers/select_window.test.sh
@@ -0,0 +1,55 @@
+#! /usr/bin/env bash
+source "../../test-helper.sh"
+source "${root}/lib/layout-helpers.sh"
+
+#
+# select_window() tests.
+#
+
+window_list() {
+  test-socket-tmux list-windows -t "$session:" \
+    -F "#{window_active}:#{window_index}" 2>/dev/null
+}
+
+# Selects given window when passed a window index
+create-test-session
+test-socket-tmux new-window -t "$session:1"
+test-socket-tmux new-window -t "$session:2"
+select_window 0
+assert "window_list | grep '^1:'" "1:0"
+select_window 1
+assert "window_list | grep '^1:'" "1:1"
+select_window 2
+assert "window_list | grep '^1:'" "1:2"
+kill-test-session
+
+# Selects given window when passed a window name
+create-test-session
+test-socket-tmux new-window -t "$session:1" -n "foo"
+test-socket-tmux new-window -t "$session:2" -n "bar"
+select_window foo
+assert "window_list | grep '^1:'" "1:1"
+select_window bar
+assert "window_list | grep '^1:'" "1:2"
+kill-test-session
+
+
+# When called ensure it sets the $window variable to the index of the newly
+# created window.
+unset window
+create-test-session
+test-socket-tmux new-window -t "$session:1" -n "foo"
+test-socket-tmux new-window -t "$session:2" -n "bar"
+select_window "foo"
+assert "echo $window" "1"
+select_window "bar"
+assert "echo $window" "2"
+select_window 1
+assert "echo $window" "1"
+select_window 2
+assert "echo $window" "2"
+kill-test-session
+unset window
+
+# End of tests.
+assert_end "select_window()"