diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index 7d300a4..ea829e0 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -3,6 +3,7 @@
 
 source test_assign.vim
 source test_backup.vim
+source test_behave.vim
 source test_bufline.vim
 source test_cd.vim
 source test_changedtick.vim
diff --git a/src/testdir/test_behave.vim b/src/testdir/test_behave.vim
new file mode 100644
index 0000000..c26bfe7
--- /dev/null
+++ b/src/testdir/test_behave.vim
@@ -0,0 +1,29 @@
+" Test the :behave command
+
+func Test_behave()
+  behave mswin
+  call assert_equal('mouse,key', &selectmode)
+  call assert_equal('popup', &mousemodel)
+  call assert_equal('startsel,stopsel', &keymodel)
+  call assert_equal('exclusive', &selection)
+
+  behave xterm
+  call assert_equal('', &selectmode)
+  call assert_equal('extend', &mousemodel)
+  call assert_equal('', &keymodel)
+  call assert_equal('inclusive', &selection)
+
+  set selection&
+  set mousemodel&
+  set keymodel&
+  set selection&
+endfunc
+
+func Test_behave_completion()
+  call feedkeys(":behave \<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"behave mswin xterm', @:)
+endfunc
+
+func Test_behave_error()
+  call assert_fails('behave x', 'E475:')
+endfunc