Handle empty tax table

[inverse-tax] / tax.test.js

diff --git a/tax.test.js b/tax.test.js
index 19597fbc2ae629fc71f399e9b67c2d884065db17..48f2e0dda7437785ccf317e5094575b6b42b1d95 100644 (file)
--- a/tax.test.js
+++ b/tax.test.js
@@ -47,6 +47,7 @@ test("merge tax tables", () => {
 });
 
 test("invert", () => {
+  assert.strictEqual(invert([                  ])(10), 10);
   assert.strictEqual(invert([[ 0, Infinity, .1]])( 9), 10);
   assert.strictEqual(invert([[10, Infinity, .1]])(19), 20);
   assert.strictEqual(invert([[0, 100, .1], [100, Infinity, .2]])(170), 200);