diff --git a/Tests/AK/TestNonnullRefPtr.cpp b/Tests/AK/TestNonnullRefPtr.cpp
index c26adadacc..7444b9f7b9 100644
--- a/Tests/AK/TestNonnullRefPtr.cpp
+++ b/Tests/AK/TestNonnullRefPtr.cpp
@@ -16,7 +16,6 @@ struct Object : public RefCounted<Object> {
 TEST_CASE(basics)
 {
     auto object = adopt_ref(*new Object);
-    EXPECT(object.ptr() != nullptr);
     EXPECT_EQ(object->ref_count(), 1u);
     object->ref();
     EXPECT_EQ(object->ref_count(), 2u);
diff --git a/Tests/Kernel/fuzz-syscalls.cpp b/Tests/Kernel/fuzz-syscalls.cpp
index e51a39824b..3b7a812c41 100644
--- a/Tests/Kernel/fuzz-syscalls.cpp
+++ b/Tests/Kernel/fuzz-syscalls.cpp
@@ -134,7 +134,7 @@ static void do_random_tests()
         0xffffffff,
     };
     dbgln("Doing a few random syscalls with:");
-    for (unsigned long& interesting_value : interesting_values) {
+    for (const auto& interesting_value : interesting_values) {
         dbgln("  {0} ({0:p})", interesting_value);
     }
     for (size_t i = 0; i < fuzz_syscall_count; ++i) {
diff --git a/Tests/LibC/accuracy-strtod.cpp b/Tests/LibC/accuracy-strtod.cpp
index 299c64f24c..af833c2323 100644
--- a/Tests/LibC/accuracy-strtod.cpp
+++ b/Tests/LibC/accuracy-strtod.cpp
@@ -326,7 +326,7 @@ static long long hex_to_ll(const char* hex)
 
 int main()
 {
-    printf("Running %lu testcases...\n", NUM_TESTCASES);
+    printf("Running %zu testcases...\n", NUM_TESTCASES);
     printf("%3s(%-5s): %16s(%2s) %16s(%2s) %16s(%2s) %16s(%2s) – %s\n", "num", "name", "correct", "cs", "builtin", "cs", "old_strtod", "cs", "new_strtod", "cs", "teststring");
 
     int successes = 0;
@@ -336,7 +336,7 @@ int main()
         if (tc.should_consume == -1) {
             tc.should_consume = strlen(tc.test_string);
         }
-        printf("%3lu(%-5s):", i, tc.test_name);
+        printf("%3zu(%-5s):", i, tc.test_name);
         printf(" %s(%2d)", tc.hex, tc.should_consume);
         long long expect_ll = hex_to_ll(tc.hex);
 
@@ -350,7 +350,7 @@ int main()
             fails += 1;
         }
     }
-    printf("Out of %lu tests, saw %d successes and %d fails.\n", NUM_TESTCASES, successes, fails);
+    printf("Out of %zu tests, saw %d successes and %d fails.\n", NUM_TESTCASES, successes, fails);
     if (fails != 0) {
         printf("FAIL\n");
         return 1;
diff --git a/Tests/LibSQL/TestSqlDatabase.cpp b/Tests/LibSQL/TestSqlDatabase.cpp
index fad6e659db..a63187ac66 100644
--- a/Tests/LibSQL/TestSqlDatabase.cpp
+++ b/Tests/LibSQL/TestSqlDatabase.cpp
@@ -24,7 +24,6 @@ void insert_and_verify(int);
 NonnullRefPtr<SQL::SchemaDef> setup_schema(SQL::Database& db)
 {
     auto schema = SQL::SchemaDef::construct("TestSchema");
-    EXPECT(schema != nullptr);
     db.add_schema(schema);
     return schema;
 }
@@ -33,7 +32,6 @@ NonnullRefPtr<SQL::SchemaDef> setup_table(SQL::Database& db)
 {
     auto schema = setup_schema(db);
     auto table = SQL::TableDef::construct(schema, "TestTable");
-    EXPECT(table != nullptr);
     db.add_table(table);
     table->append_column("TextColumn", SQL::SQLType::Text);
     table->append_column("IntColumn", SQL::SQLType::Integer);