Mocking interfaces (+adding new method to canvas to make it more JS-like)

common/test/mock/canvas.mjs

@@ -0,0 +1,59 @@
+/**
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2021-2024  Ad5001
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+export class MockCanvas {
+    constructor(mockLoading = false) {
+        this.mockLoading = mockLoading
+    }
+
+    getContext(context) {
+        throw new Error("MockCanvas.getContext not implemented")
+    }
+
+    markDirty(rect) {
+        this.requestPaint()
+    }
+
+    loadImageAsync(image) {
+        return new Promise((resolve, reject) => {
+            resolve()
+        })
+    }
+
+    /**
+     * Image loading is instantaneous.
+     * @param {string} image
+     * @return {boolean}
+     */
+    isImageLoading(image) {
+        return this.mockLoading
+    }
+
+    /**
+     * Image loading is instantaneous.
+     * @param {string} image
+     * @return {boolean}
+     */
+    isImageLoaded(image) {
+        return !this.mockLoading
+    }
+
+    requestPaint() {
+    }
+}