diff --git a/test/find.js b/test/find.js
index 6b14ce3..423b82a 100644
--- a/test/find.js
+++ b/test/find.js
@@ -37,20 +37,20 @@ var result = shell.find('resources/find');
 assert.equal(shell.error(), null);
 assert.equal(result.indexOf('resources/find/.hidden') > -1, true);
 assert.equal(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1, true);
-assert.equal(Object.keys(result).length, 10);
+assert.equal(result.length, 10);
 
 // multiple paths - comma
 var result = shell.find('resources/find/dir1', 'resources/find/dir2');
 assert.equal(shell.error(), null);
 assert.equal(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1, true);
 assert.equal(result.indexOf('resources/find/dir2/a_dir1') > -1, true);
-assert.equal(Object.keys(result).length, 6);
+assert.equal(result.length, 6);
 
 // multiple paths - array
 var result = shell.find(['resources/find/dir1', 'resources/find/dir2']);
 assert.equal(shell.error(), null);
 assert.equal(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1, true);
 assert.equal(result.indexOf('resources/find/dir2/a_dir1') > -1, true);
-assert.equal(Object.keys(result).length, 6);
+assert.equal(result.length, 6);
 
 shell.exit(123);
diff --git a/test/ls.js b/test/ls.js
index 54a6266..65e8ab2 100644
--- a/test/ls.js
+++ b/test/ls.js
@@ -23,7 +23,7 @@ shell.mkdir('tmp')
 assert.equal(fs.existsSync('/asdfasdf'), false); // sanity check
 var result = shell.ls('/asdfasdf'); // no such file or dir
 assert.ok(shell.error());
-assert.equal(Object.keys(result).length, 0);
+assert.equal(result.length, 0);
 
 //
 // Valids
@@ -45,7 +45,7 @@ assert.equal(result.indexOf('file1.js') > -1, true);
 assert.equal(result.indexOf('file2.js') > -1, true);
 assert.equal(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1, true);
 assert.equal(result.indexOf('a_dir') > -1, true);
-assert.equal(Object.keys(result).length, 6);
+assert.equal(result.length, 6);
 shell.cd('../..');
 
 // simple arg
@@ -57,7 +57,7 @@ assert.equal(result.indexOf('file1.js') > -1, true);
 assert.equal(result.indexOf('file2.js') > -1, true);
 assert.equal(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1, true);
 assert.equal(result.indexOf('a_dir') > -1, true);
-assert.equal(Object.keys(result).length, 6);
+assert.equal(result.length, 6);
 
 // no args, 'all' option
 shell.cd('resources/ls');
@@ -71,7 +71,7 @@ assert.equal(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1,
 assert.equal(result.indexOf('a_dir') > -1, true);
 assert.equal(result.indexOf('.hidden_file') > -1, true);
 assert.equal(result.indexOf('.hidden_dir') > -1, true);
-assert.equal(Object.keys(result).length, 8);
+assert.equal(result.length, 8);
 shell.cd('../..');
 
 // wildcard, simple
@@ -83,19 +83,19 @@ assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1, true);
 assert.equal(result.indexOf('resources/ls/a_dir') > -1, true);
-assert.equal(Object.keys(result).length, 6);
+assert.equal(result.length, 6);
 
 // wildcard, hidden only
 var result = shell.ls('resources/ls/.*');
 assert.equal(shell.error(), null);
 assert.equal(result.indexOf('resources/ls/.hidden_file') > -1, true);
 assert.equal(result.indexOf('resources/ls/.hidden_dir') > -1, true);
-assert.equal(Object.keys(result).length, 2);
+assert.equal(result.length, 2);
 
 // wildcard, mid-file
 var result = shell.ls('resources/ls/f*le*');
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 5);
+assert.equal(result.length, 5);
 assert.equal(result.indexOf('resources/ls/file1') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2') > -1, true);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
@@ -105,19 +105,19 @@ assert.equal(result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-es
 // wildcard, mid-file with dot (should escape dot for regex)
 var result = shell.ls('resources/ls/f*le*.js');
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 2);
+assert.equal(result.length, 2);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 
 // wildcard, should not do partial matches
 var result = shell.ls('resources/ls/*.j'); // shouldn't get .js
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 0);
+assert.equal(result.length, 0);
 
 // wildcard, all files with extension
 var result = shell.ls('resources/ls/*.*');
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 3);
+assert.equal(result.length, 3);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1, true);
@@ -125,7 +125,7 @@ assert.equal(result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-es
 // wildcard, with additional path
 var result = shell.ls('resources/ls/f*le*.js', 'resources/ls/a_dir');
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 4);
+assert.equal(result.length, 4);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 assert.equal(result.indexOf('b_dir') > -1, true); // no wildcard == no path prefix
@@ -134,7 +134,7 @@ assert.equal(result.indexOf('nada') > -1, true); // no wildcard == no path prefi
 // wildcard for both paths
 var result = shell.ls('resources/ls/f*le*.js', 'resources/ls/a_dir/*');
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 4);
+assert.equal(result.length, 4);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/a_dir/b_dir') > -1, true);
@@ -143,7 +143,7 @@ assert.equal(result.indexOf('resources/ls/a_dir/nada') > -1, true);
 // wildcard for both paths, array
 var result = shell.ls(['resources/ls/f*le*.js', 'resources/ls/a_dir/*']);
 assert.equal(shell.error(), null);
-assert.equal(Object.keys(result).length, 4);
+assert.equal(result.length, 4);
 assert.equal(result.indexOf('resources/ls/file1.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/file2.js') > -1, true);
 assert.equal(result.indexOf('resources/ls/a_dir/b_dir') > -1, true);
@@ -156,7 +156,7 @@ assert.equal(shell.error(), null);
 assert.equal(result.indexOf('a_dir') > -1, true);
 assert.equal(result.indexOf('a_dir/b_dir') > -1, true);
 assert.equal(result.indexOf('a_dir/b_dir/z') > -1, true);
-assert.equal(Object.keys(result).length, 10);
+assert.equal(result.length, 10);
 shell.cd('../..');
 
 // recusive, path given
@@ -165,7 +165,7 @@ assert.equal(shell.error(), null);
 assert.equal(result.indexOf('a_dir') > -1, true);
 assert.equal(result.indexOf('a_dir/b_dir') > -1, true);
 assert.equal(result.indexOf('a_dir/b_dir/z') > -1, true);
-assert.equal(Object.keys(result).length, 10);
+assert.equal(result.length, 10);
 
 // recursive, wildcard
 var result = shell.ls('-R', 'resources/ls/*');
@@ -173,6 +173,6 @@ assert.equal(shell.error(), null);
 assert.equal(result.indexOf('resources/ls/a_dir') > -1, true);
 assert.equal(result.indexOf('resources/ls/a_dir/b_dir') > -1, true);
 assert.equal(result.indexOf('resources/ls/a_dir/b_dir/z') > -1, true);
-assert.equal(Object.keys(result).length, 10);
+assert.equal(result.length, 10);
 
 shell.exit(123);