Merge branch 'cp/unit-test-reftable-tree'

A test in reftable library has been rewritten using the unit test
framework.

* cp/unit-test-reftable-tree:
  t-reftable-tree: improve the test for infix_walk()
  t-reftable-tree: add test for non-existent key
  t-reftable-tree: split test_tree() into two sub-test functions
  t: move reftable/tree_test.c to the unit testing framework
  reftable: remove unnecessary curly braces in reftable/tree.c

Author: gitster

Makefile

@@ -1343,6 +1343,7 @@ UNIT_TEST_PROGRAMS += t-reftable-basics
 UNIT_TEST_PROGRAMS += t-reftable-merged
 UNIT_TEST_PROGRAMS += t-reftable-pq
 UNIT_TEST_PROGRAMS += t-reftable-record
+UNIT_TEST_PROGRAMS += t-reftable-tree
 UNIT_TEST_PROGRAMS += t-strbuf
 UNIT_TEST_PROGRAMS += t-strcmp-offset
 UNIT_TEST_PROGRAMS += t-strvec
@@ -2685,7 +2686,6 @@ REFTABLE_TEST_OBJS += reftable/dump.o
 REFTABLE_TEST_OBJS += reftable/readwrite_test.o
 REFTABLE_TEST_OBJS += reftable/stack_test.o
 REFTABLE_TEST_OBJS += reftable/test_framework.o
-REFTABLE_TEST_OBJS += reftable/tree_test.o
 
 TEST_OBJS := $(patsubst %$X,%.o,$(TEST_PROGRAMS)) $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 

reftable/reftable-tests.h

@@ -14,7 +14,6 @@ int block_test_main(int argc, const char **argv);
 int record_test_main(int argc, const char **argv);
 int readwrite_test_main(int argc, const char **argv);
 int stack_test_main(int argc, const char **argv);
-int tree_test_main(int argc, const char **argv);
 int reftable_dump_main(int argc, char *const *argv);
 
 #endif

reftable/tree.c

@@ -39,25 +39,20 @@ struct tree_node *tree_search(void *key, struct tree_node **rootp,
 void infix_walk(struct tree_node *t, void (*action)(void *arg, void *key),
 		void *arg)
 {
-	if (t->left) {
+	if (t->left)
 		infix_walk(t->left, action, arg);
-	}
 	action(arg, t->key);
-	if (t->right) {
+	if (t->right)
 		infix_walk(t->right, action, arg);
-	}
 }
 
 void tree_free(struct tree_node *t)
 {
-	if (!t) {
+	if (!t)
 		return;
-	}
-	if (t->left) {
+	if (t->left)
 		tree_free(t->left);
-	}
-	if (t->right) {
+	if (t->right)
 		tree_free(t->right);
-	}
 	reftable_free(t);
 }

reftable/tree_test.c

@@ -6,7 +6,6 @@ int cmd__reftable(int argc, const char **argv)
 {
 	/* test from simple to complex. */
 	block_test_main(argc, argv);
-	tree_test_main(argc, argv);
 	readwrite_test_main(argc, argv);
 	stack_test_main(argc, argv);
 	return 0;

t/helper/test-reftable.c

@@ -0,0 +1,84 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#include "test-lib.h"
+#include "reftable/tree.h"
+
+static int t_compare(const void *a, const void *b)
+{
+	return (char *)a - (char *)b;
+}
+
+struct curry {
+	void **arr;
+	size_t len;
+};
+
+static void store(void *arg, void *key)
+{
+	struct curry *c = arg;
+	c->arr[c->len++] = key;
+}
+
+static void t_tree_search(void)
+{
+	struct tree_node *root = NULL;
+	void *values[11] = { 0 };
+	struct tree_node *nodes[11] = { 0 };
+	size_t i = 1;
+
+	/*
+	 * Pseudo-randomly insert the pointers for elements between
+	 * values[1] and values[10] (inclusive) in the tree.
+	 */
+	do {
+		nodes[i] = tree_search(&values[i], &root, &t_compare, 1);
+		i = (i * 7) % 11;
+	} while (i != 1);
+
+	for (i = 1; i < ARRAY_SIZE(nodes); i++) {
+		check_pointer_eq(&values[i], nodes[i]->key);
+		check_pointer_eq(nodes[i], tree_search(&values[i], &root, &t_compare, 0));
+	}
+
+	check(!tree_search(values, &root, t_compare, 0));
+	tree_free(root);
+}
+
+static void t_infix_walk(void)
+{
+	struct tree_node *root = NULL;
+	void *values[11] = { 0 };
+	void *out[11] = { 0 };
+	struct curry c = {
+		.arr = (void **) &out,
+	};
+	size_t i = 1;
+	size_t count = 0;
+
+	do {
+		tree_search(&values[i], &root, t_compare, 1);
+		i = (i * 7) % 11;
+		count++;
+	} while (i != 1);
+
+	infix_walk(root, &store, &c);
+	for (i = 1; i < ARRAY_SIZE(values); i++)
+		check_pointer_eq(&values[i], out[i - 1]);
+	check(!out[i - 1]);
+	check_int(c.len, ==, count);
+	tree_free(root);
+}
+
+int cmd_main(int argc, const char *argv[])
+{
+	TEST(t_tree_search(), "tree_search works");
+	TEST(t_infix_walk(), "infix_walk works");
+
+	return test_done();
+}