SONARJAVA-6790: Implement S9350: equals() implementations should not compare mismatched members

java-checks-test-sources/default/src/main/files/non-compiling/checks/EqualsMismatchedMembersCheckSample.java

@@ -0,0 +1,46 @@
+package checks;
+
+class EqualsMismatchedMembersCheckSample {
+
+  class UnknownMembers {
+    UnknownType a;
+    UnknownType b;
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof UnknownMembers that)) {
+        return false;
+      }
+      return a == that.b && Unknown.equal(a, that.a); // Noncompliant
+    }
+  }
+
+  class UnknownReceiver {
+    int a;
+    int b;
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof UnknownReceiver that)) {
+        return false;
+      }
+      return this.a == unknown.b && this.a == that.a;
+    }
+  }
+
+  class VoidGetter {
+    int a;
+    int b;
+
+    void getA() {
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof VoidGetter that)) {
+        return false;
+      }
+      return getA() == that.b;
+    }
+  }
+}