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diff --git a/src/base/humanize.file_size.tests.cc b/src/base/humanize.file_size.tests.cc
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+++ b/src/base/humanize.file_size.tests.cc
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+/**
+ * Copyright (c) 2021, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <iostream>
+
+#include "base/humanize.hh"
+
+#include "config.h"
+#include "doctest/doctest.h"
+
+TEST_CASE("humanize::file_size")
+{
+    CHECK(humanize::file_size(0, humanize::alignment::columnar) == "0.0 B");
+    CHECK(humanize::file_size(1, humanize::alignment::columnar) == "1.0 B");
+    CHECK(humanize::file_size(1024, humanize::alignment::columnar) == "1.0KB");
+    CHECK(humanize::file_size(1500, humanize::alignment::columnar) == "1.5KB");
+    CHECK(humanize::file_size(55LL * 784LL * 1024LL * 1024LL,
+                              humanize::alignment::columnar)
+          == "42.1GB");
+    CHECK(humanize::file_size(-1LL, humanize::alignment::columnar)
+          == "Unknown");
+    CHECK(humanize::file_size(std::numeric_limits<int64_t>::max(),
+                              humanize::alignment::columnar)
+          == "8.0EB");
+}