Add tests, however non-functional due to lack of File in Node

Also add jimp to package.json

package.json

@@ -92,6 +92,7 @@
     "exif-parser": "^0.1.12",
     "file-saver": "^2.0.0-rc.4",
     "highlight.js": "^9.13.1",
+    "jimp": "^0.6.0",
     "jquery": "^3.3.1",
     "js-crc": "^0.2.0",
     "js-sha3": "^0.8.0",

src/core/Utils.mjs

@@ -855,7 +855,7 @@ class Utils {
                 let dataURI = "data:";
                 dataURI += type + ";";
                 dataURI += "base64," + toBase64(buff);
-                return "<img src='" + dataURI + "'>";
+                return "<img style='max-width: 100%;' src='" + dataURI + "'>";
             } else {
                 return `<pre>${Utils.escapeHtml(Utils.arrayBufferToStr(buff.buffer))}</pre>`;
             }

src/core/operations/SplitColourChannels.mjs

@@ -64,7 +64,7 @@ class SplitColourChannels extends Operation {
                         ]).getBufferAsync(jimp.MIME_PNG);
                     resolve(new File([new Uint8Array((await split).values())], "red.png", {type: "image/png"}));
                 } catch (err) {
-                    reject(new OperationError("Could not split red channel."));
+                    reject(new OperationError(`Could not split red channel: ${err}`));
                 }
             });
             const green = new Promise(async (resolve, reject) => {
@@ -76,7 +76,7 @@ class SplitColourChannels extends Operation {
                         ]).getBufferAsync(jimp.MIME_PNG);
                     resolve(new File([new Uint8Array((await split).values())], "green.png", {type: "image/png"}));
                 } catch (err) {
-                    reject(new OperationError("Could not split green channel."));
+                    reject(new OperationError(`Could not split green channel: ${err}`));
                 }
             });
             const blue = new Promise(async (resolve, reject) => {
@@ -88,7 +88,7 @@ class SplitColourChannels extends Operation {
                         ]).getBufferAsync(jimp.MIME_PNG);
                     resolve(new File([new Uint8Array((await split).values())], "blue.png", {type: "image/png"}));
                 } catch (err) {
-                    reject(new OperationError("Could not split blue channel."));
+                    reject(new OperationError(`Could not split blue channel: ${err}`));
                 }
             });
             return await Promise.all([red, green, blue]);

test/index.mjs

@@ -73,6 +73,7 @@ import "./tests/operations/SeqUtils";
 import "./tests/operations/SetDifference";
 import "./tests/operations/SetIntersection";
 import "./tests/operations/SetUnion";
+import "./tests/operations/SplitColourChannels";
 import "./tests/operations/StrUtils";
 import "./tests/operations/SymmetricDifference";
 import "./tests/operations/TextEncodingBruteForce";