refactor(compare): add waitOnCreatingInitialSnapshot (#231)

Author: SvetoslavTsenov

lib/appium-driver.ts

@@ -590,6 +590,9 @@ export class AppiumDriver {
         // First time capture
         if (!existsSync(pathExpectedImage)) {
             const pathActualImage = resolvePath(this._storageByDeviceName, imageName.replace(".", "_actual."));
+            if (this.imageHelper.waitOnCreatingInitialSnapshot > 0) {
+                await this.driver.wait(this.imageHelper.waitOnCreatingInitialSnapshot);
+            }
             await this.takeScreenshot(pathActualImage);
 
             if (rect) {

lib/image-helper.d.ts

@@ -5,7 +5,9 @@ export declare class ImageHelper {
     private _args;
     private _imageCropRect;
     private _blockOutAreas;
+    private _waitOnCreatingInitialSnapshot;
     constructor(_args: INsCapabilities);
+    waitOnCreatingInitialSnapshot: number;
     imageCropRect: IRectangle;
     blockOutAreas: IRectangle[];
     imageOutputLimit(): ImageOptions;

lib/image-helper.ts

@@ -10,10 +10,19 @@ export class ImageHelper {
 
     private _imageCropRect: IRectangle;
     private _blockOutAreas: IRectangle[];
+    private _waitOnCreatingInitialSnapshot: number;
 
     constructor(private _args: INsCapabilities) {
     }
 
+    get waitOnCreatingInitialSnapshot() {
+        return this._waitOnCreatingInitialSnapshot;
+    }
+
+    set waitOnCreatingInitialSnapshot(waitOnCreatingInitialSnapshot: number) {
+        this._waitOnCreatingInitialSnapshot = waitOnCreatingInitialSnapshot;
+    }
+
     get imageCropRect(): IRectangle {
         return this._imageCropRect;
     }
@@ -103,9 +112,11 @@ export class ImageHelper {
 
         if (typeThreshold == ImageOptions.percent) {
             valueThreshold = Math.floor(valueThreshold * 100);
+            console.log(`Using ${valueThreshold}\ ${typeThreshold} tolerance`);
+        } else {
+            console.log(`Using ${valueThreshold} tolerance`);
         }
 
-        console.log(`Using ${valueThreshold}\ ${typeThreshold} tolerance`);
         const result = this.runDiff(diff, output);
         this._blockOutAreas = undefined;
         return result;