Doc refresh, changelog and dead code removal for #977

test/unit/resize.js

@@ -478,4 +478,40 @@ describe('Resize dimensions', function () {
       fixtures.assertSimilar(fixtures.expected('fast-shrink-on-load-true.png'), data, done);
     });
   });
+
+  [
+    sharp.kernel.nearest,
+    sharp.kernel.cubic,
+    sharp.kernel.lanczos2,
+    sharp.kernel.lanczos3
+  ].forEach(function (kernel) {
+    it(`kernel ${kernel}`, function (done) {
+      sharp(fixtures.inputJpg)
+        .resize(320, null, { kernel: kernel })
+        .toBuffer(function (err, data, info) {
+          if (err) throw err;
+          assert.strictEqual('jpeg', info.format);
+          assert.strictEqual(320, info.width);
+          fixtures.assertSimilar(fixtures.inputJpg, data, done);
+        });
+    });
+  });
+
+  it('nearest upsampling with integral factor', function (done) {
+    sharp(fixtures.inputTiff8BitDepth)
+      .resize(210, 210, { kernel: 'nearest' })
+      .png()
+      .toBuffer(function (err, data, info) {
+        if (err) throw err;
+        assert.strictEqual(210, info.width);
+        assert.strictEqual(210, info.height);
+        done();
+      });
+  });
+
+  it('unknown kernel throws', function () {
+    assert.throws(function () {
+      sharp().resize(null, null, { kernel: 'unknown' });
+    });
+  });
 });