Apply suggestions from code review

Co-authored-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com>

Author: mbknust

src/lib/format/tests/TestFlatTreePosition.cpp

@@ -93,15 +93,15 @@ class ByName
 };
 
 #define ASSERT_HAS_NAME(p, n)                                                                                                      \
-    EXPECT_NE(p.Get(), nullptr);                                                                                                   \
+    ASSERT_NE(p.Get(), nullptr);                                                                                                   \
     EXPECT_EQ(strcmp(p.Get()->name, n), 0)
 
 #define ASSERT_HAS_CONTEXT_TAG(p, t)                                                                                               \
-    EXPECT_NE(p.Get(), nullptr);                                                                                                   \
+    ASSERT_NE(p.Get(), nullptr);                                                                                                   \
     EXPECT_EQ(p.Get()->tag, ContextTag(t))
 
 #define ASSERT_HAS_PROFILE_TAG(p, a, b)                                                                                            \
-    EXPECT_NE(p.Get(), nullptr);                                                                                                   \
+    ASSERT_NE(p.Get(), nullptr);                                                                                                   \
     EXPECT_EQ(p.Get()->tag, ProfileTag(a, b))
 
 template <size_t N>