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diff --git a/tests/tests.h b/tests/tests.h
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+++ b/tests/tests.h
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+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/**
+ * Unit tests.
+ */
+
+#ifndef BFS_TESTS_H
+#define BFS_TESTS_H
+
+#include "bfstd.h"
+#include "diag.h"
+
+/** Memory allocation tests. */
+void check_alloc(void);
+
+/** Standard library wrapper tests. */
+void check_bfstd(void);
+
+/** Bit manipulation tests. */
+void check_bit(void);
+
+/** I/O queue tests. */
+void check_ioq(void);
+
+/** Linked list tests. */
+void check_list(void);
+
+/** Signal hook tests. */
+void check_sighook(void);
+
+/** Trie tests. */
+void check_trie(void);
+
+/** Process spawning tests. */
+void check_xspawn(void);
+
+/** Time tests. */
+void check_xtime(void);
+
+/** Record a single check and return the result. */
+bool bfs_check_impl(bool result);
+
+/**
+ * Check a condition, logging a message on failure but continuing.
+ */
+#define bfs_check(...) \
+	bfs_check_(#__VA_ARGS__, __VA_ARGS__, "", )
+
+#define bfs_check_(str, cond, format, ...) \
+	bfs_check_impl((cond) || (bfs_check__(format, BFS_DIAG_MSG_(format, str),  __VA_ARGS__), false))
+
+#define bfs_check__(format, ...) \
+	bfs_diagf(sizeof(format) > 1 \
+			? BFS_DIAG_FORMAT_("%s" format "%s") \
+			: BFS_DIAG_FORMAT_("Check failed: `%s`"), \
+		BFS_DIAG_ARGS_(__VA_ARGS__))
+
+/**
+ * Check a condition, logging the current error string on failure.
+ */
+#define bfs_echeck(...) \
+	bfs_echeck_(#__VA_ARGS__, __VA_ARGS__, "", )
+
+#define bfs_echeck_(str, cond, format, ...) \
+	bfs_check_impl((cond) || (bfs_echeck__(format, BFS_DIAG_MSG_(format, str), __VA_ARGS__), false))
+
+#define bfs_echeck__(format, ...) \
+	bfs_diagf(sizeof(format) > 1 \
+			? BFS_DIAG_FORMAT_("%s" format "%s: %s") \
+			: BFS_DIAG_FORMAT_("Check failed: `%s`: %s"), \
+		BFS_DIAG_ARGS_(__VA_ARGS__ errstr(), ))
+
+#endif // BFS_TESTS_H