chore: add a unit test

josdejong · Jun 20, 2023 · 20e05d8 · 20e05d8
1 parent cf575ff
commit 20e05d8
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/src/utils.ts b/src/utils.ts
@@ -19,7 +19,7 @@ const NUMBER_REGEX = /^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$/
 
 /**
  * Test whether a string can be safely represented with a number
- * without information.
+ * without information loss.
  *
  * When approx is true, floating point numbers that lose a few digits but
  * are still approximately equal in value are considered safe too.

diff --git a/test/utils.test.ts b/test/utils.test.ts
@@ -35,6 +35,9 @@ test('isSafeNumber', () => {
   expect(isSafeNumber('0.66666666666666666667')).toEqual(false)
   expect(isSafeNumber('12345678901234567890')).toEqual(false)
   expect(isSafeNumber('1.2345678901234567890')).toEqual(false)
+
+  // the following number loses formatting, but the value stays the same and hence is safe
+  expect(isSafeNumber('2.300')).toEqual(true)
 })
 
 test('isSafeNumber({ approx: false })', () => {