cleanup failures for existing tests

src/common/cpp_essentials/pattern.rs

@@ -117,8 +117,8 @@ impl<'a> PatternView<'_> {
     }
     pub fn end(&self) -> Option<PatternType> {
         if self.start + self.count < self.data.0.len() {
-            Some(self.data.0[self.start + self.count])    
-        }else {
+            Some(self.data.0[self.start + self.count])
+        } else {
             None
         }
     }

src/qrcode/cpp_port/detector.rs

@@ -63,7 +63,7 @@ pub fn FindFinderPatterns(image: &BitMatrix, tryHarder: bool) -> FinderPatterns
         while {
             if let Ok(next) = FindLeftGuard(&next, 0, &PATTERN, 0.5) {
                 next.isValid()
-            }else {
+            } else {
                 false
             }
             // let Ok(next) = FindLeftGuard(&next, 0, &PATTERN, 0.5) else {
@@ -134,6 +134,11 @@ pub fn GenerateFinderPatternSets(patterns: &mut FinderPatterns) -> FinderPattern
     let cosLower: f64 = (135.0_f64 / 180.0 * 3.1415).cos();
 
     let nbPatterns = (patterns).len();
+
+    if nbPatterns < 2 {
+        return FinderPatternSets::default();
+    }
+
     for i in 0..(nbPatterns - 2) {
         // for (int i = 0; i < nbPatterns - 2; i++) {
         for j in (i + 1)..(nbPatterns - 1) {