fix: test + build

Author: colin-axner

go/ops.go

@@ -57,7 +57,7 @@ func validateIavlOps(op opType, layerNum int) error {
 	remLen := r.Len()
 	if layerNum == 0 {
 		if remLen != 0 {
-			return fmt.Errorf("expected remaining prefix to be 0, got: %d", r2)
+			return fmt.Errorf("expected remaining prefix to be 0, got: %d", remLen)
 		}
 	} else {
 		// when the child comes from the left, the suffix if filled in

go/ops_test.go

@@ -114,7 +114,7 @@ func TestInnerOpCheckAgainstSpec(t *testing.T) {
 			func() {
 				innerOp.Prefix = []byte{0x01}
 			},
-			fmt.Errorf("wrong value in IAVL leaf op"),
+			fmt.Errorf("IAVL height (-1) must be non-negative and less than the layer number (1)"),
 		},
 		{
 			"failure: inner prefix starts with leaf prefix",

go/proof_test.go

@@ -52,7 +52,7 @@ func TestCheckAgainstSpec(t *testing.T) {
 			if tc.Err == "" && err != nil {
 				t.Fatalf("Unexpected error: %v", err)
 			} else if tc.Err != "" && tc.Err != err.Error() {
-				t.Fatalf("Expected error: %s, got %s", tc.Err, err.Error())
+				t.Fatalf("Expected error: %s, got: %s", tc.Err, err.Error())
 			}
 		})
 	}

testdata/TestCheckAgainstSpecData.json

@@ -907,7 +907,7 @@
         "hash": 1
       }
     },
-    "Err": "inner, unexpected EOF"
+    "Err": "inner, IAVL height (0) must be non-negative and less than the layer number (3)"
   },
   "rejects only inner proof (hash mismatch)": {
     "Proof": {