Fail fast for unknown interpolator

test/unit/interpolation.js

@@ -94,15 +94,13 @@ describe('Interpolation', function() {
   });
 
   it('unknown interpolator throws', function(done) {
-    sharp(fixtures.inputJpg)
-      .resize(320, 240)
-      .interpolateWith('nonexistant')
-      .toBuffer()
-      .catch(function (e) {
-        assert(
-          e.toString().match(/VipsInterpolate: class "nonexistant" not found/)
-        );
-      })
-      .finally(done);
+    var isValid = false;
+    try {
+      sharp().interpolateWith('nonexistant');
+      isValid = true;
+    } catch (e) {}
+    assert(!isValid);
+    done();
   });
+
 });

test/unit/normalize.js

@@ -34,7 +34,7 @@ describe('Normalization', function () {
     sharp(fixtures.inputJpgWithLowContrast)
       .gamma()
       .greyscale()
-      .normalize()
+      .normalize(true)
       .raw()
       .toBuffer(function (err, data, info) {
         if (err) throw err;