diff --git a/test/lib/env-test.sh b/test/lib/env-test.sh
new file mode 100755
index 0000000..a445044
--- /dev/null
+++ b/test/lib/env-test.sh
@@ -0,0 +1,33 @@
+#! /usr/bin/env bash
+source "../test-helper.sh"
+
+#
+# env.sh tests.
+#
+
+# Setup
+TMUXIFIER="/path/to/tmuxifier"
+unset TMUXIFIER_LAYOUT_PATH
+
+# When TMUXIFIER_LAYOUT_PATH is not set.
+source "../../lib/env.sh"
+assert 'echo $TMUXIFIER_LAYOUT_PATH' "${TMUXIFIER}/layouts"
+
+# When TMUXIFIER_LAYOUT_PATH is set and has a trailing slash.
+TMUXIFIER_LAYOUT_PATH="/path/to/layouts/"
+source "../../lib/env.sh"
+assert 'echo $TMUXIFIER_LAYOUT_PATH' "/path/to/layouts"
+unset TMUXIFIER_LAYOUT_PATH
+
+# When TMUXIFIER_LAYOUT_PATH is set and does not have a trailing slash.
+TMUXIFIER_LAYOUT_PATH="/path/to/layouts"
+source "../../lib/env.sh"
+assert 'echo $TMUXIFIER_LAYOUT_PATH' "/path/to/layouts"
+unset TMUXIFIER_LAYOUT_PATH
+
+
+# Teardown
+unset TMUXIFIER
+
+# End of tests.
+assert_end "env.sh"