I discovered a bug in my code writing the test. I had the comparison …

…backwards (>= instead of <= as it should have been) and that's why the test was failing. I'm converted to TDD.

lib/staticGzip.js

@@ -136,10 +136,10 @@ exports = module.exports = function staticGzip(dirPath, options){
 			var base = path.basename(filename),
 					dir = path.dirname(filename),
 					gzipName = path.join(dir, base + '.gz');
-
+			
 			if (req.headers['if-modified-since'] &&
 				gzippoCache[gzipName] &&
-				(new Date(gzippoCache[gzipName].mtime)).getTime() >= (new Date(req.headers['if-modified-since'])).getTime()) {
+				(new Date(gzippoCache[gzipName].mtime)).getTime() <= (new Date(req.headers['if-modified-since'])).getTime()) {
 				contentType = contentType + (charset ? '; charset=' + charset : '');
 				res.setHeader('Content-Type', contentType);
 				res.setHeader('Content-Encoding', 'gzip');

test/staticGzipTest.js

@@ -111,22 +111,27 @@ module.exports = {
 		);
 	},
 	'requesting gzipped utf-8 file second time caches': function() {
-		assert.response(app, { url: '/utf8.txt', headers: { 'Accept-Encoding':"gzip" } }, function(res) {
-			console.log(res);
-			assert.response(app,
-				{
-					url: '/utf8.txt',
-					headers: {
-						'Accept-Encoding':"gzip",
-						'If-Modified-Since': 'Mon, 28 Dec 2020 01:00:00 GMT'
-					}
-				},
-				function(res) {
-					console.log(res);
-					res.statusCode.should.equal(304);
+		assert.response(app,
+			{
+				url: '/utf8.txt',
+				headers: {
+					'Accept-Encoding':"gzip",
 				}
-			);
-
-		});
+			},
+			function(res) {
+				assert.response(app,
+					{
+						url: '/utf8.txt',
+						headers: {
+							'Accept-Encoding':"gzip",
+							'If-Modified-Since': 'Mon, 28 Dec 2020 01:00:00 GMT'
+						}
+					},
+					function(res) {
+						res.statusCode.should.equal(304);
+					}
+				);
+			}
+		);
 	}
 };