Improve set tests (#20)

* Add reliable unit tests for set order

* Upgrade gradle wrapper

* Enable gradle configuration cache

* Fix sonar findings

---------

Co-authored-by: kaklakariada <[email protected]>

Author: kaklakariada

gradle.properties

@@ -0,0 +1 @@
+org.gradle.configuration-cache=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

settings.gradle

@@ -11,3 +11,5 @@ dependencyResolutionManagement {
         mavenCentral()
     }
 }
+
+enableFeaturePreview "STABLE_CONFIGURATION_CACHE"

src/main/java/org/itsallcode/matcher/MismatchReporter.java

@@ -9,7 +9,7 @@
  * does not match, the overall state is 'not matching'. Additionally it builds a
  * description of the mismatch.
  */
-public class MismatchReporter {
+public final class MismatchReporter {
     private final Description mismatchDescription;
     private boolean firstMismatch = true;
     private boolean matches = true;

src/main/java/org/itsallcode/matcher/auto/AutoConfigBuilder.java

@@ -55,11 +55,11 @@ class AutoConfigBuilder<T> {
 
     MatcherConfig<T> build() {
         Arrays.stream(expected.getClass().getMethods()) //
-                .filter(this::isNotIgnored) //
+                .filter(AutoConfigBuilder::isNotIgnored) //
                 .filter(this::isGetterMethodName) //
-                .filter(this::isGetterMethodSignature) //
+                .filter(AutoConfigBuilder::isGetterMethodSignature) //
                 .sorted(Comparator.comparing(this::hasSimpleReturnType).reversed() //
-                        .thenComparing(this::hasArrayReturnType) //
+                        .thenComparing(AutoConfigBuilder::hasArrayReturnType) //
                         .thenComparing(Method::getName)) //
                 .forEach(this::addConfigForGetter);
         return configBuilder.build();
@@ -178,11 +178,11 @@ private static <T> Matcher<T> createOptionalMatcher(final T expected) {
         return (Matcher<T>) OptionalMatchers.isPresentAnd(AutoMatcher.equalTo(expectedOptional.get()));
     }
 
-    private boolean isNotIgnored(final Method method) {
+    private static boolean isNotIgnored(final Method method) {
         return !IGNORED_METHOD_NAMES.contains(method.getName());
     }
 
-    private boolean isGetterMethodSignature(final Method method) {
+    private static boolean isGetterMethodSignature(final Method method) {
         return method.getParameterCount() == 0 //
                 && !method.getReturnType().equals(Void.TYPE);
     }
@@ -202,7 +202,7 @@ private void addConfigForGetter(final Method method) {
         configBuilder.addProperty(propertyName, createGetter(method), AutoMatcher::equalTo);
     }
 
-    private boolean hasArrayReturnType(final Method method) {
+    private static boolean hasArrayReturnType(final Method method) {
         return method.getReturnType().isArray();
     }
 

src/main/java/org/itsallcode/matcher/auto/OptionalMatchers.java

@@ -18,7 +18,10 @@
  * 
  * @author npathai, sweiler
  */
-class OptionalMatchers {
+final class OptionalMatchers {
+    // This is an utility class that must not be instantiated.
+    private OptionalMatchers() {
+    }
 
     /**
      * Creates a matcher that matches when the examined {@code Optional} contains no
@@ -101,8 +104,4 @@ protected void describeMismatchSafely(final Optional<T> item, final Description
             }
         }
     }
-
-    // This is an utility class that must not be instantiated.
-    private OptionalMatchers() {
-    }
 }

src/main/java/org/itsallcode/matcher/config/MatcherConfig.java

@@ -120,7 +120,8 @@ public <P> Builder<B> addIterableProperty(final String propertyName,
             return addPropertyInternal(propertyName, listMatcher, propertyAccessor);
         }
 
-        private <P> Matcher<Iterable<? extends P>> createListMatcher(final Function<P, Matcher<P>> matcherBuilder,
+        private static <P> Matcher<Iterable<? extends P>> createListMatcher(
+                final Function<P, Matcher<P>> matcherBuilder,
                 final Iterable<? extends P> expectedPropertyValue) {
             if (expectedPropertyValue == null) {
                 return createNullIterableMatcher();
@@ -135,7 +136,7 @@ private <P> Matcher<Iterable<? extends P>> createListMatcher(final Function<P, M
         }
 
         @SuppressWarnings({ "unchecked", "rawtypes" })
-        private <P> Matcher<Iterable<? extends P>> createNullIterableMatcher() {
+        private static <P> Matcher<Iterable<? extends P>> createNullIterableMatcher() {
             return new NullIterableMatcher();
         }
 

src/test/java/org/itsallcode/matcher/auto/AutoMatcherSetTest.java

@@ -42,12 +42,21 @@ void testEmptySetAndAsSetOfAreEqual() {
         assertValuesMatch(emptySet(), Set.of());
     }
 
-    @RepeatedTest(name = "ignores set order repetition {currentRepetition} of {totalRepetitions}", value = 50)
+    @RepeatedTest(name = "ignores set order repetition {currentRepetition} of {totalRepetitions}", value = 20)
     void ignoresSetOrder() {
-
+        final long value = System.nanoTime();
+        final String value1 = "value" + value;
+        final String value2 = "value2" + (value + 1);
         final Set<String> set = new HashSet<>();
-        set.add("value1");
-        set.add("value2");
-        assertValuesMatch(Set.of("value1", "value2"), set);
+        set.add(value1);
+        set.add(value2);
+        assertValuesMatch(Set.of(value1, value2), set);
+    }
+
+    @Test
+    void ignoresSetOrderForLinkedHashSet() {
+        final Set<String> set1 = new LinkedHashSet<>(List.of("a", "b"));
+        final Set<String> set2 = new LinkedHashSet<>(List.of("b", "a"));
+        assertValuesMatch(set1, set2);
     }
 }

src/test/java/org/itsallcode/matcher/model/DemoModelMatcherTest.java

@@ -26,11 +26,12 @@ abstract class DemoModelMatcherTest extends MatcherTestBase<DemoModel> {
     static final String ATTR2 = "attrValue2";
     static final String ATTR3 = "attrValue3";
 
-    static String SIMPLE_MODEL_DESCRIPTION = "{id=<" + ID1 + ">, longVal=null, name=\"" + NAME1
+    static final String SIMPLE_MODEL_DESCRIPTION = "{id=<" + ID1 + ">, longVal=null, name=\"" + NAME1
             + "\", attr=null, children=null, stringArray=null}";
     static final String CHILD1 = "{id=<" + ID2 + ">, longVal=null, name=\"" + NAME2 + "\", attr={value=\"" + ATTR2
             + "\"}, children=an empty iterable, stringArray=null}";
-    static String COMPLEX_MODEL_DESCRIPTION = "{id=<" + ID1 + ">, longVal=null, name=\"" + NAME1 + "\", attr={value=\""
+    static final String COMPLEX_MODEL_DESCRIPTION = "{id=<" + ID1 + ">, longVal=null, name=\"" + NAME1
+            + "\", attr={value=\""
             + ATTR1 + "\"}, children=iterable containing [" + CHILD1 + "], stringArray=null}";
 
     @Test