added sequence count provider abstraction

unittests/util/CMakeLists.txt

@@ -1 +1,2 @@
-target_sources(${FSFW_TEST_TGT} PRIVATE testUnsignedByteField.cpp)
+target_sources(${FSFW_TEST_TGT} PRIVATE testUnsignedByteField.cpp
+                                        testSeqCountProvider.cpp)

unittests/util/testSeqCountProvider.cpp

@@ -0,0 +1,35 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "fsfw/util/SeqCountProvider.h"
+
+TEST_CASE("Seq Count Providers", "[util]") {
+  auto genericProviderTest = [](ProvidesSeqCountIF& provider, unsigned expectedWidth) {
+    CHECK(provider.get() == 0);
+    CHECK(provider.bitWidth() == expectedWidth);
+    CHECK(provider.getAndIncrement() == 0);
+    CHECK(provider.getAndIncrement() == 1);
+    CHECK(provider.get() == 2);
+    provider.increment();
+    provider.increment();
+    CHECK(provider.get() == 4);
+  };
+  {
+    SeqCountProviderU16 provider;
+    genericProviderTest(provider, 16);
+  }
+
+  {
+    SeqCountProviderU32 provider;
+    genericProviderTest(provider, 32);
+  }
+
+  {
+    SeqCountProviderU8 provider;
+    genericProviderTest(provider, 8);
+    for (unsigned i = 4; i < UINT8_MAX + 1; i++) {
+      provider.increment();
+    }
+    // Verify wrap-around.
+    CHECK(provider.get() == 0);
+  }
+}