add test for custom icons

Backpack-SwiftUI/Tests/Icons/BPKIconViewTests.swift

@@ -53,4 +53,14 @@ class BPKIconViewTests: XCTestCase {
     func testAutoMirrorSmallIcon() {
         assertSnapshot(BPKIconView(.arrowLeft, size: .small))
     }
+
+    func testCustomSmallIcon() {
+        let bundle = Bundle(for: BPKIconViewTests.self)
+        assertSnapshot(BPKIconView(BPKIcon(name: "custom-icon", bundle: TestsBundle.bundle!), size: .small))
+    }
+
+    func testCustomLargeIcon() {
+        let bundle = Bundle(for: BPKIconViewTests.self)
+        assertSnapshot(BPKIconView(BPKIcon(name: "custom-icon", bundle: TestsBundle.bundle!), size: .large))
+    }
 }

Backpack-SwiftUI/Tests/Images.xcassets/custom-icon-lg.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "custom-icon-lg.svg",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Backpack-SwiftUI/Tests/Images.xcassets/custom-icon-sm.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "custom-icon-sm.svg",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}