patch: Feature/pkm autodetect (#15)

tests/icard_preview_source_tests.cpp

@@ -17,6 +17,20 @@ public:
     }
 };
 
+class AutoDetectPreviewSource final : public ICardPreviewSource {
+public:
+    [[nodiscard]] bool supportsAutoDetectPrint() const noexcept override {
+        return true;
+    }
+
+    Result<std::string, PreviewLookupError>
+        fetchImageUrl(std::string_view,
+                      std::string_view,
+                      std::string_view) override {
+        return Result<std::string, PreviewLookupError>::ok("https://example.test/card.png");
+    }
+};
+
 }  // namespace
 
 TEST_SUITE("ICardPreviewSource defaults") {
@@ -25,6 +39,11 @@ TEST_SUITE("ICardPreviewSource defaults") {
         CHECK_FALSE(src.supportsAutoDetectPrint());
     }
 
+    TEST_CASE("implementations may override supportsAutoDetectPrint") {
+        AutoDetectPreviewSource src;
+        CHECK(src.supportsAutoDetectPrint());
+    }
+
     TEST_CASE("default detectFirstPrint returns explicit unsupported error") {
         MinimalPreviewSource src;
         const auto out = src.detectFirstPrint("Card", "Set");