diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.replace.indirect.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.replace.indirect.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.replace.indirect.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.replace.indirect.pass.cpp
@@ -22,9 +22,6 @@
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
 
-// TODO: Investigate why this fails on MinGW-shared
-// UNSUPPORTED: target={{.+}}-windows-gnu
-
 #include <new>
 #include <cstddef>
 #include <cstdlib>
@@ -58,11 +55,11 @@
     {
         new_called = delete_called = 0;
         OverAligned* x = new OverAligned[3];
-        assert(static_cast<void*>(x) == DummyData);
-        assert(new_called == 1);
+        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(static_cast<void*>(x) == DummyData);
+        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(new_called == 1);
 
         delete[] x;
-        assert(delete_called == 1);
+        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(delete_called == 1);
     }
 
     // Test with a type that is right on the verge of being overaligned
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align_nothrow.replace.indirect.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align_nothrow.replace.indirect.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align_nothrow.replace.indirect.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align_nothrow.replace.indirect.pass.cpp
@@ -23,9 +23,6 @@
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
 
-// TODO: Investigate why this fails on MinGW-shared
-// UNSUPPORTED: target={{.+}}-windows-gnu
-
 #include <new>
 #include <cstddef>
 #include <cstdlib>
@@ -58,7 +55,7 @@
     {
         new_called = delete_called = 0;
         OverAligned* x = new (std::nothrow) OverAligned[3];
-        assert(static_cast<void*>(x) == DummyData);
+        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(static_cast<void*>(x) == DummyData);
         ASSERT_WITH_OPERATOR_NEW_FALLBACKS(new_called == 1);
 
         delete[] x;
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_nothrow.replace.indirect.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_nothrow.replace.indirect.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_nothrow.replace.indirect.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_nothrow.replace.indirect.pass.cpp
@@ -14,7 +14,9 @@
 // XFAIL: libcpp-no-vcruntime
 // XFAIL: LIBCXX-AIX-FIXME
 
-// TODO: Investigate why this fails on Windows
+// MSVC/vcruntime falls back from the nothrow array new to the nothrow
+// scalar new, instead of falling back on the throwing array new.
+// https://developercommunity.visualstudio.com/t/vcruntime-nothrow-array-operator-new-fal/10373274
 // XFAIL: target={{.+}}-windows-msvc
 
 #include <new>
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align_nothrow.replace.indirect.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align_nothrow.replace.indirect.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align_nothrow.replace.indirect.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align_nothrow.replace.indirect.pass.cpp
@@ -22,9 +22,6 @@
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
 
-// TODO: Investigate why this fails on MinGW-shared
-// UNSUPPORTED: target={{.+}}-windows-gnu
-
 #include <new>
 #include <cstddef>
 #include <cstdlib>
@@ -57,7 +54,7 @@
     {
         new_called = delete_called = 0;
         OverAligned* x = new (std::nothrow) OverAligned;
-        assert(static_cast<void*>(x) == DummyData);
+        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(static_cast<void*>(x) == DummyData);
         ASSERT_WITH_OPERATOR_NEW_FALLBACKS(new_called == 1);
 
         delete x;