diff --git a/test/isSorted/isSorted.test.js b/test/isSorted/isSorted.test.js
index bdc272dcb..183435cd4 100644
--- a/test/isSorted/isSorted.test.js
+++ b/test/isSorted/isSorted.test.js
@@ -8,6 +8,7 @@ test('Testing isSorted', (t) => {
 	//t.deepEqual(isSorted(args..), 'Expected');
 	t.equal(isSorted([0, 1, 2, 2]), 1, 'Array is sorted in ascending order');
 	t.equal(isSorted([4, 3, 2]), -1, 'Array is sorted in descending order');
+	t.equal(isSorted([4, 3, 5]), 0, 'Array is not sorted, direction changed in array')
 	//t.false(isSorted(args..), 'Expected');
 	//t.throws(isSorted(args..), 'Expected');
 	t.end();
diff --git a/test/isString/isString.test.js b/test/isString/isString.test.js
index c3b892e27..7d47db410 100644
--- a/test/isString/isString.test.js
+++ b/test/isString/isString.test.js
@@ -5,6 +5,12 @@ test('Testing isString', (t) => {
 	//For more information on all the methods supported by tape
 	//Please go to https://github.com/substack/tape
 	t.true(typeof isString === 'function', 'isString is a Function');
+	t.equal(isString('foo'), true, 'foo is a string');
+	t.equal(isString('10'), true, '"10" is a string');
+	t.equal(isString(''), true, 'Empty string is a string');
+	t.equal(isString(10), false, '10 is not a string');
+	t.equal(isString(true), false, 'true is not string');
+
 	//t.deepEqual(isString(args..), 'Expected');
 	//t.equal(isString(args..), 'Expected');
 	//t.false(isString(args..), 'Expected');