Add more tests

tests/inflate_test.cpp

@@ -198,12 +198,27 @@ TEST (HuffmanTests, TestReadChunkFixed) {
 
         ASSERT_EQ (read_chunk((char *) buf, HUFFMAN_FIXED), i); 
     }
+    
+    /* Test reading all possible fixed distances */
 
-    // TODO test fixed distance codes as well? 
-}
+    /*
+     * Mapping of distance literal -> code, again, as laid out in memory. 
+     */
+    int codes_dist[30] = {0, 16, 8, 24, 4, 20, 12, 28, 2, 18, 10, 26, 6, 22, 
+                          14, 30, 1, 17, 9, 25, 5, 21, 13, 29, 3, 19, 11, 
+                          27, 7, 23}; 
+
+    for (int i = 0; i < 30; i++) { 
+        reset_pos(); 
 
-// TODO 
-TEST (HuffmanTests, TestReadLens) {}
+        int code = codes_dist[i];
+        unsigned char buf[1];
+
+        buf[0] = code; 
+        ASSERT_EQ (read_chunk((char *) buf, HUFFMAN_FIXED_DISTS), i);
+    }
+
+}
 
 int main(int argc, char **argv) { 
     ::testing::InitGoogleTest(&argc, argv);