Add crop coordinate unit test

android-app/app/src/test/java/ru/obdai/receipt/crop/CropHelperTest.kt

@@ -0,0 +1,16 @@
+package ru.obdai.receipt.crop
+
+import android.graphics.Rect
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+
+@RunWith(RobolectricTestRunner::class)
+class CropHelperTest {
+    @Test
+    fun scalesBitmapBoundsToViewBounds() {
+        val result = CropHelper.scaleToView(Rect(100, 200, 500, 600), 1000, 1000, 500, 1000)
+        assertEquals(Rect(50, 200, 250, 600), result)
+    }
+}