[PATCH v2 01/10] t/unit-tests: implement reftable test helper functions in unit-test.{c,h}

[Seyi Kuforiji <kuforiji98@gmail.com>]

Helper functions defined in `t/unit-tests/lib-reftable.{c,h}` are
required for the reftable-related test files to run efficeintly. In the
current implementation these functions are designed to conform with our
homegrown unit-testing structure. So in other to convert the reftable
test files, there is need for a clar specific implementation of these
helper functions.

type cast `for (size_t i = 0; i < (size_t)stats->ref_stats.blocks;
i++)`, implement equivalent helper functions in unit-test.{c,h} to use
clar. These functions conform with the clar testing framework and become
available for all reftable-related test files implemented using the clar
testing framework, which requires them. This will be used by subsequent
commits.

Signed-off-by: Seyi Kuforiji <kuforiji98@gmail.com>
---
 t/unit-tests/unit-test.c | 93 ++++++++++++++++++++++++++++++++++++++++
 t/unit-tests/unit-test.h | 16 +++++++
 2 files changed, 109 insertions(+)

diff --git a/t/unit-tests/unit-test.c b/t/unit-tests/unit-test.c
index 5af645048a..6c2a4e6aa8 100644
--- a/t/unit-tests/unit-test.c
+++ b/t/unit-tests/unit-test.c
@@ -1,10 +1,103 @@
 #include "unit-test.h"
 #include "hex.h"
 #include "parse-options.h"
+#include "reftable/constants.h"
+#include "reftable/writer.h"
 #include "strbuf.h"
 #include "string-list.h"
 #include "strvec.h"
 
+void cl_reftable_set_hash(uint8_t *p, int i, enum reftable_hash id)
+{
+	memset(p, (uint8_t)i, hash_size(id));
+}
+
+static ssize_t strbuf_writer_write(void *b, const void *data, size_t sz)
+{
+	strbuf_add(b, data, sz);
+	return sz;
+}
+
+static int strbuf_writer_flush(void *arg UNUSED)
+{
+	return 0;
+}
+
+struct reftable_writer *cl_reftable_strbuf_writer(struct reftable_buf *buf,
+						 struct reftable_write_options *opts)
+{
+	struct reftable_writer *writer;
+	int ret = reftable_writer_new(&writer, &strbuf_writer_write, &strbuf_writer_flush,
+				      buf, opts);
+	cl_assert(ret == 0);
+	return writer;
+}
+
+void cl_reftable_write_to_buf(struct reftable_buf *buf,
+			     struct reftable_ref_record *refs,
+			     size_t nrefs,
+			     struct reftable_log_record *logs,
+			     size_t nlogs,
+			     struct reftable_write_options *_opts)
+{
+	struct reftable_write_options opts = { 0 };
+	const struct reftable_stats *stats;
+	struct reftable_writer *writer;
+	uint64_t min = 0xffffffff;
+	uint64_t max = 0;
+	int ret;
+
+	if (_opts)
+		opts = *_opts;
+
+	for (size_t i = 0; i < nrefs; i++) {
+		uint64_t ui = refs[i].update_index;
+		if (ui > max)
+			max = ui;
+		if (ui < min)
+			min = ui;
+	}
+	for (size_t i = 0; i < nlogs; i++) {
+		uint64_t ui = logs[i].update_index;
+		if (ui > max)
+			max = ui;
+		if (ui < min)
+			min = ui;
+	}
+
+	writer = cl_reftable_strbuf_writer(buf, &opts);
+	reftable_writer_set_limits(writer, min, max);
+
+	if (nrefs) {
+		ret = reftable_writer_add_refs(writer, refs, nrefs);
+		cl_assert_equal_i(ret, 0);
+	}
+
+	if (nlogs) {
+		ret = reftable_writer_add_logs(writer, logs, nlogs);
+		cl_assert_equal_i(ret, 0);
+	}
+
+	ret = reftable_writer_close(writer);
+	cl_assert_equal_i(ret, 0);
+
+	stats = reftable_writer_stats(writer);
+	for (size_t i = 0; i < (size_t)stats->ref_stats.blocks; i++) {
+		size_t off = i * (opts.block_size ? opts.block_size
+						  : DEFAULT_BLOCK_SIZE);
+		if (!off)
+			off = header_size(opts.hash_id == REFTABLE_HASH_SHA256 ? 2 : 1);
+		cl_assert(buf->buf[off] == 'r');
+	}
+
+	if (nrefs)
+		cl_assert(stats->ref_stats.blocks > 0);
+	if (nlogs)
+		cl_assert(stats->log_stats.blocks > 0);
+
+	reftable_writer_free(writer);
+}
+
 static const char * const unit_test_usage[] = {
 	N_("unit-test [<options>]"),
 	NULL,
diff --git a/t/unit-tests/unit-test.h b/t/unit-tests/unit-test.h
index 85e5d6a948..fe0aebd876 100644
--- a/t/unit-tests/unit-test.h
+++ b/t/unit-tests/unit-test.h
@@ -1,8 +1,24 @@
 #include "git-compat-util.h"
 #include "clar/clar.h"
 #include "clar-decls.h"
+#include "git-compat-util.h"
+#include "reftable/reftable-writer.h"
 #include "strbuf.h"
 
+struct reftable_buf;
+
+void cl_reftable_set_hash(uint8_t *p, int i, enum reftable_hash id);
+
+struct reftable_writer *cl_reftable_strbuf_writer(struct reftable_buf *buf,
+						 struct reftable_write_options *opts);
+
+void cl_reftable_write_to_buf(struct reftable_buf *buf,
+			     struct reftable_ref_record *refs,
+			     size_t nrecords,
+			     struct reftable_log_record *logs,
+			     size_t nlogs,
+			     struct reftable_write_options *opts);
+
 #define cl_failf(fmt, ...) do { \
 	char desc[4096]; \
 	snprintf(desc, sizeof(desc), fmt, __VA_ARGS__); \
-- 
2.43.0