diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
index 298a6db..7df641c 100644
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -190,6 +190,22 @@
   call remove(v:errors, 0)
 
   call assert_fails('call assert_inrange(1, 1)', 'E119:')
+
+  if has('float')
+    call assert_equal(0, assert_inrange(7.0, 7, 7))
+    call assert_equal(0, assert_inrange(7, 7.0, 7))
+    call assert_equal(0, assert_inrange(7, 7, 7.0))
+    call assert_equal(0, assert_inrange(5, 7, 5.0))
+    call assert_equal(0, assert_inrange(5, 7, 6.0))
+    call assert_equal(0, assert_inrange(5, 7, 7.0))
+
+    call assert_equal(1, assert_inrange(5, 7, 4.0))
+    call assert_match("Expected range 5.0 - 7.0, but got 4.0", v:errors[0])
+    call remove(v:errors, 0)
+    call assert_equal(1, assert_inrange(5, 7, 8.0))
+    call assert_match("Expected range 5.0 - 7.0, but got 8.0", v:errors[0])
+    call remove(v:errors, 0)
+  endif
 endfunc
 
 func Test_assert_with_msg()