Change file naming

This is a follow-up to previous commit.

unit/include/BH/Unit.h

@@ -0,0 +1,56 @@
+#ifndef BH_UNIT_H
+#define BH_UNIT_H
+
+#include <stdio.h>
+#include <math.h>
+
+typedef int (*BH_UnitCallback)(void);
+
+#define BH_VERIFY(e) \
+    do { \
+        if (!(e)) { \
+            printf("%s:%d\t%s\n", __FILE__, __LINE__, #e); \
+            return -1; \
+        } \
+    } while(0)
+
+
+#define BH_FAIL(msg) \
+    do { \
+        printf("%s:%d\t%s\n", __FILE__, __LINE__, msg); \
+        return -1; \
+    } while(0)
+
+
+#define BH_VERIFY_DELTA(x, y, e) \
+    do { \
+        double BH_VERIFY_DELTA = (x)-(y); \
+        if (BH_VERIFY_DELTA < 0.0) \
+            BH_VERIFY_DELTA = -BH_VERIFY_DELTA; \
+        if (BH_VERIFY_DELTA > (e)) { \
+            printf("%s:%d\t%s (differs by %f)\n", __FILE__, __LINE__, #x " == " #y, BH_VERIFY_DELTA); \
+            return -1; \
+        } \
+    } while(0)
+
+
+
+/**
+ * Adds unit test \a cb with name \a name for the testing.
+ *
+ * \param name  Unit test name
+ * \param cb    Unit test function
+ */
+void BH_UnitAdd(const char *name,
+                BH_UnitCallback cb);
+
+
+/**
+ * Runs unit tests.
+ *
+ * \return On success, returns zero.
+ * \return On failure, returns error code.
+ */
+int BH_UnitRun(void);
+
+#endif /* BH_UNIT_H */