diff --git a/tests/apple2.enc.c b/tests/apple2.enc.c
index 5148d91..98da9bd 100644
--- a/tests/apple2.enc.c
+++ b/tests/apple2.enc.c
@@ -4,6 +4,60 @@
 #include "apple2.enc.h"
 #include "vm_segment.h"
 
+/*
+ * A sector fixture; something we can use when testing sector encoding
+ * and decoding. This is the unencoded form of a sector, in 256 bytes.
+ */
+static vm_8bit f_sector[] = {
+    0xdd, 0xab, 0xce, 0xd9, 0xc3, 0xf6, 0xdd, 0x77, 0x0e, 0x60, 0x6d, 0x95, 0xbd, 0xe3, 0x74, 0xc0,
+    0xd4, 0xa7, 0x3f, 0xc2, 0x39, 0x37, 0xfa, 0xa7, 0xd1, 0xa9, 0xc9, 0x5e, 0xd3, 0x28, 0x47, 0x04,
+    0x4f, 0xec, 0xfc, 0xc1, 0x5e, 0x90, 0x9a, 0x7d, 0x72, 0x36, 0xd0, 0x23, 0x90, 0xe5, 0x18, 0xeb,
+    0x8a, 0x80, 0xad, 0xda, 0x85, 0xe4, 0xe3, 0x34, 0x72, 0x5c, 0x51, 0x18, 0xf0, 0xec, 0x3f, 0xcf,
+    0xf7, 0xc1, 0x61, 0xe7, 0xad, 0x78, 0xea, 0x8a, 0xa1, 0x53, 0xbc, 0x05, 0x06, 0x77, 0x40, 0xb1,
+    0xfb, 0x21, 0xf4, 0xec, 0x7a, 0xd3, 0xee, 0xcd, 0x99, 0xfa, 0x95, 0x39, 0xf8, 0xe8, 0x2d, 0xf5,
+    0x40, 0x1a, 0x68, 0x0b, 0x7e, 0x96, 0x4c, 0x05, 0x03, 0x74, 0xa9, 0xca, 0x1d, 0x30, 0xf0, 0x96,
+    0x7d, 0xe9, 0x24, 0xca, 0x6b, 0x09, 0x50, 0x69, 0x35, 0xe0, 0x1b, 0xd8, 0xfb, 0x62, 0x47, 0xe6,
+    0x6a, 0xad, 0x3a, 0xd2, 0x5c, 0xe6, 0xda, 0x5f, 0x62, 0xfb, 0x02, 0x61, 0x2b, 0x42, 0x7a, 0x44,
+    0xa2, 0x2f, 0x97, 0xe5, 0x08, 0xc7, 0xf6, 0xe1, 0x7a, 0xd6, 0x6a, 0xc0, 0x11, 0xd6, 0xa4, 0x26,
+    0xac, 0xe4, 0xfb, 0xf3, 0x28, 0x8a, 0x3b, 0x1b, 0x4c, 0x9c, 0x84, 0x55, 0x73, 0x4b, 0x4f, 0xc1,
+    0x0a, 0xd8, 0x9e, 0xdc, 0x1b, 0x01, 0xec, 0x12, 0x41, 0x84, 0x15, 0x8c, 0xb9, 0x29, 0x5f, 0x34,
+    0x99, 0x3e, 0x3b, 0xa8, 0xcf, 0x7c, 0x65, 0x6f, 0x60, 0x45, 0x73, 0xe4, 0xea, 0x84, 0x84, 0x8b,
+    0xaa, 0x46, 0x72, 0xbc, 0xd2, 0x65, 0xbe, 0x5b, 0x2d, 0x24, 0xd6, 0x41, 0x88, 0xd0, 0x6a, 0x80,
+    0x1e, 0x22, 0x7a, 0x44, 0x70, 0x17, 0x44, 0x18, 0x1f, 0x31, 0x41, 0xf5, 0xa0, 0xae, 0x1b, 0xe1,
+    0x4f, 0x9f, 0xdb, 0x5a, 0x74, 0x90, 0x55, 0xe1, 0x49, 0xbf, 0x2d, 0x20, 0xd6, 0x03, 0x03, 0xa2,
+};
+
+/*
+ * This is the 6-and-2 encoded form of the f_sector array above. It does
+ * _not_ include the sector header, which is tested in a separate
+ * function.
+ */
+static vm_8bit f_enc_sector[] = {
+    0xb6, 0xcb, 0xb5, 0xfa, 0xb5, 0xe6, 0xb9, 0xf3, 0xea, 0xe7, 0xd6, 0xdb, 0xad, 0xb9, 0xfe, 0xe7,
+    0xfd, 0xeb, 0xfa, 0xee, 0xf3, 0xe9, 0xb7, 0xfa, 0xde, 0xcb, 0xf6, 0xcb, 0xcb, 0x96, 0xfa, 0xec,
+    0xaf, 0xaf, 0xcb, 0xcb, 0xf7, 0xee, 0xec, 0xd3, 0xd9, 0xbb, 0xf6, 0xd9, 0xab, 0xbf, 0xcb, 0xcb,
+    0xb2, 0xa6, 0xcb, 0x97, 0xf4, 0xf5, 0xac, 0xed, 0xb9, 0xad, 0xae, 0xdf, 0xce, 0xe9, 0xb5, 0xb5,
+    0x9f, 0xab, 0xe9, 0xbc, 0x9e, 0xde, 0x9a, 0xb3, 0xb6, 0xd3, 0xdd, 0xbe, 0xd7, 0xb2, 0xd6, 0xb5,
+    0xac, 0xfc, 0xce, 0xbe, 0x9e, 0x9f, 0xaf, 0xac, 0xe6, 0xcf, 0xcb, 0x9b, 0xfe, 0xac, 0xbc, 0xdc,
+    0xea, 0x9e, 0xcd, 0xdd, 0xff, 0xfe, 0x9b, 0xf2, 0xbc, 0xce, 0xcf, 0xbd, 0xdc, 0xda, 0xfe, 0xcb,
+    0xb4, 0xb6, 0xdf, 0x9d, 0xb3, 0xde, 0xf2, 0x9a, 0xf9, 0x9b, 0xb5, 0xf9, 0xfc, 0xe9, 0xce, 0xff,
+    0xfc, 0xbd, 0x9a, 0xad, 0xce, 0xbc, 0xbd, 0x97, 0xf4, 0xb5, 0xad, 0x9b, 0xb6, 0xfa, 0xa6, 0xf3,
+    0xfc, 0xb2, 0xaf, 0xdf, 0xd7, 0xb6, 0xf4, 0xdb, 0xbd, 0xac, 0xfc, 0xfb, 0xeb, 0x96, 0xcd, 0xaf,
+    0xfc, 0xb6, 0xf5, 0xf4, 0x9f, 0xdc, 0xe6, 0xb3, 0xa7, 0xba, 0xbd, 0xcb, 0xe7, 0xed, 0x9d, 0xee,
+    0xf5, 0xea, 0xbb, 0xcd, 0xbd, 0xce, 0xfa, 0xf5, 0xb6, 0x97, 0xce, 0xf6, 0xbd, 0xf4, 0xad, 0xed,
+    0xbe, 0xfa, 0xdc, 0xf2, 0xfb, 0xdf, 0xbd, 0xbb, 0xb2, 0xbc, 0xf4, 0xfe, 0xed, 0xa7, 0xdd, 0xab,
+    0xdf, 0xda, 0xee, 0xdc, 0xfa, 0xda, 0xeb, 0xb3, 0xd7, 0xb3, 0xdd, 0xfe, 0xbd, 0xb6, 0xbf, 0xb2,
+    0xb3, 0xf9, 0xda, 0xeb, 0xcd, 0xfb, 0xf2, 0xae, 0x9e, 0xdd, 0xe7, 0xec, 0xe6, 0xf3, 0xee, 0xcd,
+    0xd6, 0xd9, 0xb6, 0xa6, 0x9a, 0xf5, 0xdf, 0xe9, 0xa7, 0xba, 0xf3, 0x9f, 0xf3, 0xab, 0xb2, 0x97,
+    0xda, 0xef, 0xf3, 0xb5, 0xb4, 0xee, 0x9f, 0xfb, 0xff, 0xb9, 0xee, 0xdb, 0xdd, 0xaf, 0xdb, 0xce,
+    0xbf, 0xe7, 0xe5, 0x97, 0xdb, 0xbe, 0xe9, 0x9f, 0x9a, 0x9b, 0xab, 0xaf, 0xdc, 0x9b, 0xcb, 0x96,
+    0x9b, 0xa7, 0xfb, 0xaf, 0xf2, 0xcb, 0xea, 0xf5, 0xf9, 0xce, 0x9a, 0xfc, 0xdc, 0xef, 0xbb, 0xeb,
+    0xfa, 0xde, 0xb3, 0xbb, 0xb3, 0xaf, 0xbe, 0xb9, 0xbc, 0x97, 0xad, 0xcd, 0xea, 0xba, 0x9b, 0xea,
+    0xfe, 0xe7, 0xf3, 0xb5, 0xd6, 0xad, 0xf9, 0xee, 0xea, 0xe6, 0xfd, 0xdb, 0x9b, 0xfd, 0xf4, 0x96,
+    0xdf, 0xdf, 0xde, 0xaa, 0xeb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+};
+
 static vm_segment *seg;
 
 static void
@@ -83,4 +137,20 @@ Test(apple2_enc, sector_header)
 
 Test(apple2_enc, sector)
 {
+    vm_segment *dest = vm_segment_create(1000);
+    int i, len;
+
+    vm_segment_copy_buf(seg, f_sector, 0, 0, 256);
+    
+    len = apple2_enc_sector(dest, seg, 0, 0);
+    
+    // The number of bytes (343, plus the self-sync, prologue/epilogue,
+    // etc. etc.)
+    cr_assert_eq(len, 382);
+
+    // Let's see if the bytes equal what we expect for our sector
+    // fixture
+    for (i = 14; i < 382; i++) {
+        cr_assert_eq(vm_segment_get(dest, i), f_enc_sector[i - 14]);
+    }
 }