Enable unittests and comments

Makefile

@@ -29,7 +29,7 @@ shared:     LIB = libbiod.so
 lib:        LIB = libbiod
 
 # debug check:    DFLAGS += -O0 -d-debug -unittest -link-debuglib
-check:          DFLAGS += -O0 -d-debug -link-debuglib
+check:          DFLAGS += -O0 -d-debug -link-debuglib -unittest
 release static: DFLAGS += -O3 -release -enable-inlining -boundscheck=off
 static:         DFLAGS += -static -L-Bstatic
 shared:         DFLAGS += -shared
@@ -54,7 +54,7 @@ $(BIN): $(OBJ)
 	$(D_COMPILER) $(DFLAGS) $(OBJ) -of=$(BIN)
 
 check: $(BIN)
-	$(info running tests...)
+	$(info Make check running tests...)
 	$(BIN)
 
 # $(BIN) "--DRT-gcopt=gc:precise disable:1 cleanup:none"

bio/core/bgzf/block.d

@@ -125,10 +125,10 @@ class DecompressedBgzfBlock {
 DecompressedBgzfBlock decompressBgzfBlock(BgzfBlock block)
 {
     if (block.input_size == 0) {
-        return new DecompressedBgzfBlock(block.start_offset,
-                                     block.start_offset + block.bsize + 1,
-                                     cast(ubyte[])[]); // EOF marker
-        // TODO: add check for correctness of EOF marker
+      return new DecompressedBgzfBlock(block.start_offset,
+                                       block.start_offset + block.bsize + 1,
+                                       cast(ubyte[])[]); // EOF marker
+      // TODO: add check for correctness of EOF marker
     }
 
     /*

bio/core/bgzf/inputstream.d

@@ -461,6 +461,8 @@ class BgzfInputStream : Stream {
         _pool = pool;
         // _cache = cache;
 
+        // The roundbuf size (n_tasks) should be at least
+        // the number of threads
         size_t n_tasks = max(pool.size, 1) * 2;
         if (buffer_size > 0)
             n_tasks = max(n_tasks, buffer_size / BGZF_MAX_BLOCK_SIZE);