Add CMocka unit tests (#6985)

* Add str2ld test

* Build test with Autotools

* Add storage_number test

* Configure tests in CMake

7 files changed, 147 insertions, 0 deletions

diff --git a/libnetdata/Makefile.am b/libnetdata/Makefile.am
index 87f12b32cb..7dc808fab1 100644
--- a/libnetdata/Makefile.am
+++ b/libnetdata/Makefile.am
@@ -23,6 +23,7 @@ SUBDIRS = \
     storage_number \
     threads \
     url \
+    tests \
     $(NULL)
 
 dist_noinst_DATA = \
diff --git a/libnetdata/required_dummies.h b/libnetdata/required_dummies.h
new file mode 100644
index 0000000000..aa87e3964c
--- /dev/null
+++ b/libnetdata/required_dummies.h
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_LIB_DUMMIES_H
+#define NETDATA_LIB_DUMMIES_H 1
+
+// callback required by fatal()
+void netdata_cleanup_and_exit(int ret)
+{
+    exit(ret);
+}
+
+void send_statistics(const char *action, const char *action_result, const char *action_data)
+{
+    (void)action;
+    (void)action_result;
+    (void)action_data;
+    return;
+}
+
+// callbacks required by popen()
+void signals_block(void){};
+void signals_unblock(void){};
+void signals_reset(void){};
+
+// callback required by eval()
+int health_variable_lookup(const char *variable, uint32_t hash, struct rrdcalc *rc, calculated_number *result)
+{
+    (void)variable;
+    (void)hash;
+    (void)rc;
+    (void)result;
+    return 0;
+};
+
+// required by get_system_cpus()
+char *netdata_configured_host_prefix = "";
+
+#endif // NETDATA_LIB_DUMMIES_H
diff --git a/libnetdata/storage_number/Makefile.am b/libnetdata/storage_number/Makefile.am
index 1cb69ed99a..349dd71f1c 100644
--- a/libnetdata/storage_number/Makefile.am
+++ b/libnetdata/storage_number/Makefile.am
@@ -3,6 +3,9 @@
 AUTOMAKE_OPTIONS = subdir-objects
 MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
 
+SUBDIRS = \
+	tests \
+	$(NULL)
 
 dist_noinst_DATA = \
 	README.md \
diff --git a/libnetdata/storage_number/tests/Makefile.am b/libnetdata/storage_number/tests/Makefile.am
new file mode 100644
index 0000000000..babdcf0df3
--- /dev/null
+++ b/libnetdata/storage_number/tests/Makefile.am
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
diff --git a/libnetdata/storage_number/tests/test_storage_number.c b/libnetdata/storage_number/tests/test_storage_number.c
new file mode 100644
index 0000000000..61a0c18805
--- /dev/null
+++ b/libnetdata/storage_number/tests/test_storage_number.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../../libnetdata.h"
+#include "../../required_dummies.h"
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void test_number_pinting(void **state)
+{
+    (void)state;
+
+    char value[50];
+
+    print_calculated_number(value, 0);
+    assert_string_equal(value, "0");
+
+    print_calculated_number(value, 0.0000001);
+    assert_string_equal(value, "0.0000001");
+
+    print_calculated_number(value, 0.00000009);
+    assert_string_equal(value, "0.0000001");
+
+    print_calculated_number(value, 0.000000001);
+    assert_string_equal(value, "0");
+
+    print_calculated_number(value, 99.99999999999999999);
+    assert_string_equal(value, "100");
+
+    print_calculated_number(value, -99.99999999999999999);
+    assert_string_equal(value, "-100");
+
+    print_calculated_number(value, 123.4567890123456789);
+    assert_string_equal(value, "123.456789");
+
+    print_calculated_number(value, 9999.9999999);
+    assert_string_equal(value, "9999.9999999");
+
+    print_calculated_number(value, -9999.9999999);
+    assert_string_equal(value, "-9999.9999999");
+}
+
+int main(void)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(test_number_pinting)
+    };
+
+    return cmocka_run_group_tests_name("storage_number", tests, NULL, NULL);
+}
diff --git a/libnetdata/tests/Makefile.am b/libnetdata/tests/Makefile.am
new file mode 100644
index 0000000000..babdcf0df3
--- /dev/null
+++ b/libnetdata/tests/Makefile.am
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
diff --git a/libnetdata/tests/test_str2ld.c b/libnetdata/tests/test_str2ld.c
new file mode 100644
index 0000000000..9d59f6c0e2
--- /dev/null
+++ b/libnetdata/tests/test_str2ld.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
+#include "../required_dummies.h"
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void test_str2ld(void **state)
+{
+    (void)state;
+    char *values[] = {
+        "1.2345678",
+        "-35.6",
+        "0.00123",
+        "23842384234234.2",
+        ".1",
+        "1.2e-10",
+        "hello",
+        "1wrong",
+        "nan",
+        "inf",
+        NULL
+    };
+
+    for (int i = 0; values[i]; i++) {
+        char *e_mine = "hello", *e_sys = "world";
+        LONG_DOUBLE mine = str2ld(values[i], &e_mine);
+        LONG_DOUBLE sys = strtold(values[i], &e_sys);
+
+        if (isnan(mine))
+            assert_true(isnan(sys));
+        else if (isinf(mine))
+            assert_true(isinf(sys));
+        else if (mine != sys)
+            assert_false(abs(mine - sys) > 0.000001);
+
+        assert_ptr_equal(e_mine, e_sys);
+    }
+}
+
+int main(void)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(test_str2ld)
+    };
+
+    return cmocka_run_group_tests_name("str2ld", tests, NULL, NULL);
+}