diff --git a/lib/search/binary.js b/lib/search/binary.js
index 704f37d..364f947 100644
--- a/lib/search/binary.js
+++ b/lib/search/binary.js
@@ -23,16 +23,19 @@ module.exports = binary;
 function binary(array, value) {
   var low = -1;
   var high = array.length;
+  var midpoint;
 
   while (high - low > 1) {
-    var midpoint = high + low >> 1;
+    midpoint = high + low >> 1;
 
     if (array[midpoint] > value) {
       high = midpoint;
     } else if (array[midpoint] < value) {
       low = midpoint;
     } else {
-      return array[midpoint] === value ? value : undefined;
+      break;
     }
   }
+
+  return array[midpoint] === value ? value : undefined;
 }
diff --git a/lib/search/test/binary-test.js b/lib/search/test/binary-test.js
index 52c4978..72fb640 100644
--- a/lib/search/test/binary-test.js
+++ b/lib/search/test/binary-test.js
@@ -2,6 +2,8 @@ var test = require('tape');
 var binary = require('../binary');
 
 test('binary(array, value)', function (t) {
+  t.equal(binary([]), undefined, 'should return undefined');
+  t.equal(binary([1, 10], 0), undefined, 'should return undefined');
   t.equal(binary([1, 2, 3, 4, 5], 3), 3, 'should return 3');
   t.equal(binary(['a', 'b', 'c', 'd', 'e', 'f'], 'd'), 'd', 'should return d');
   t.end();
diff --git a/lib/search/test/linear-test.js b/lib/search/test/linear-test.js
index 34d5d81..ee25284 100644
--- a/lib/search/test/linear-test.js
+++ b/lib/search/test/linear-test.js
@@ -2,6 +2,8 @@ var test = require('tape');
 var linear = require('../linear');
 
 test('linear(array, value)', function (t) {
+  t.equal(linear([]), undefined, 'should return undefined');
+  t.equal(linear([1, 10], 0), undefined, 'should return undefined');
   t.equal(linear([1, 2, 3, 4, 5], 3), 3, 'should return 3');
   t.equal(linear(['c', 'a', 'b'], 'a'), 'a', 'should return a');
   t.equal(linear(['foo', 'bar', 'baz'], 'foo'), 'foo', 'should return foo');