t-example-decorate: remove test messages

The test_msg() calls only repeat information already present in test
descriptions and check definitions, which are shown automatically if
the checks fail.  Remove the redundant messages to simplify the tests
and their output.  Here it is with all of them failing before:

 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:18
 # when adding a brand-new object, NULL should be returned
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:21
 # when adding a brand-new object, NULL should be returned
 not ok 1 - Add 2 objects, one with a non-NULL decoration and one with a NULL decoration.
 # check "ret == &vars->decoration_a" failed at t/unit-tests/t-example-decorate.c:29
 # when readding an already existing object, existing decoration should be returned
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:32
 # when readding an already existing object, existing decoration should be returned
 not ok 2 - When re-adding an already existing object, the old decoration is returned.
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:40
 # lookup should return added declaration
 # check "ret == &vars->decoration_b" failed at t/unit-tests/t-example-decorate.c:43
 # lookup should return added declaration
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:46
 # lookup for unknown object should return NULL
 not ok 3 - Lookup returns the added declarations, or NULL if the object was never added.
 # check "objects_noticed == 2" failed at t/unit-tests/t-example-decorate.c:58
 #    left: 1
 #   right: 2
 # should have 2 objects
 not ok 4 - The user can also loop through all entries.
 1..4

... and here with the patch applied:

 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:18
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:20
 not ok 1 - Add 2 objects, one with a non-NULL decoration and one with a NULL decoration.
 # check "ret == &vars->decoration_a" failed at t/unit-tests/t-example-decorate.c:27
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:29
 not ok 2 - When re-adding an already existing object, the old decoration is returned.
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:36
 # check "ret == &vars->decoration_b" failed at t/unit-tests/t-example-decorate.c:38
 # check "ret == NULL" failed at t/unit-tests/t-example-decorate.c:40
 not ok 3 - Lookup returns the added declarations, or NULL if the object was never added.
 # check "objects_noticed == 2" failed at t/unit-tests/t-example-decorate.c:51
 #    left: 1
 #   right: 2
 not ok 4 - The user can also loop through all entries.
 1..4

Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

t/unit-tests/t-example-decorate.c

@@ -15,36 +15,29 @@ static void t_add(struct test_vars *vars)
 {
 	void *ret = add_decoration(&vars->n, vars->one, &vars->decoration_a);
 
-	if (!check(ret == NULL))
-		test_msg("when adding a brand-new object, NULL should be returned");
+	check(ret == NULL);
 	ret = add_decoration(&vars->n, vars->two, NULL);
-	if (!check(ret == NULL))
-		test_msg("when adding a brand-new object, NULL should be returned");
+	check(ret == NULL);
 }
 
 static void t_readd(struct test_vars *vars)
 {
 	void *ret = add_decoration(&vars->n, vars->one, NULL);
 
-	if (!check(ret == &vars->decoration_a))
-		test_msg("when readding an already existing object, existing decoration should be returned");
+	check(ret == &vars->decoration_a);
 	ret = add_decoration(&vars->n, vars->two, &vars->decoration_b);
-	if (!check(ret == NULL))
-		test_msg("when readding an already existing object, existing decoration should be returned");
+	check(ret == NULL);
 }
 
 static void t_lookup(struct test_vars *vars)
 {
 	void *ret = lookup_decoration(&vars->n, vars->one);
 
-	if (!check(ret == NULL))
-		test_msg("lookup should return added declaration");
+	check(ret == NULL);
 	ret = lookup_decoration(&vars->n, vars->two);
-	if (!check(ret == &vars->decoration_b))
-		test_msg("lookup should return added declaration");
+	check(ret == &vars->decoration_b);
 	ret = lookup_decoration(&vars->n, vars->three);
-	if (!check(ret == NULL))
-		test_msg("lookup for unknown object should return NULL");
+	check(ret == NULL);
 }
 
 static void t_loop(struct test_vars *vars)
@@ -55,8 +48,7 @@ static void t_loop(struct test_vars *vars)
 		if (vars->n.entries[i].base)
 			objects_noticed++;
 	}
-	if (!check_int(objects_noticed, ==, 2))
-		test_msg("should have 2 objects");
+	check_int(objects_noticed, ==, 2);
 }
 
 int cmd_main(int argc UNUSED, const char **argv UNUSED)