tests/unittests: add test for CRC-32 checksum

tests/unittests/tests-checksum/tests-checksum-crc32.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2022 Benjamin Valentin <benpicco@googlemail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+
+#include "checksum/crc32.h"
+#include "tests-checksum.h"
+
+static void test_checksum_crc32_sequence_empty(void)
+{
+    unsigned char buf[] = "";
+    uint32_t expect = 0x0;
+
+    TEST_ASSERT_EQUAL_INT(expect, crc32(buf, sizeof(buf) - 1));
+}
+
+static void test_checksum_crc32_sequence_1a(void)
+{
+    unsigned char buf[] = "A";
+    uint32_t expect = 0xd3d99e8b;
+
+    TEST_ASSERT_EQUAL_INT(expect, crc32(buf, sizeof(buf) - 1));
+}
+
+static void test_checksum_crc32_sequence_256a(void)
+{
+    unsigned char buf[] = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
+    uint32_t expect = 0x49975b13;
+
+    TEST_ASSERT_EQUAL_INT(expect, crc32(buf, sizeof(buf) - 1));
+}
+
+static void test_checksum_crc32_sequence_1to9(void)
+{
+    unsigned char buf[] = "123456789";
+    uint32_t expect = 0xcbf43926;
+
+    TEST_ASSERT_EQUAL_INT(expect, crc32(buf, sizeof(buf) - 1));
+}
+
+static void test_checksum_crc32_sequence_4bytes(void)
+{
+    unsigned char buf[] = { 0x12, 0x34, 0x56, 0x78 };
+    uint32_t expect = 0x4a090e98;
+
+    TEST_ASSERT_EQUAL_INT(expect, crc32(buf, sizeof(buf)));
+}
+
+Test *tests_checksum_crc32_tests(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_checksum_crc32_sequence_empty),
+        new_TestFixture(test_checksum_crc32_sequence_1a),
+        new_TestFixture(test_checksum_crc32_sequence_256a),
+        new_TestFixture(test_checksum_crc32_sequence_1to9),
+        new_TestFixture(test_checksum_crc32_sequence_4bytes),
+    };
+
+    EMB_UNIT_TESTCALLER(checksum_crc32_tests, NULL, NULL, fixtures);
+
+    return (Test *)&checksum_crc32_tests;
+}

tests/unittests/tests-checksum/tests-checksum.c

@@ -15,6 +15,7 @@ void tests_checksum(void)
     TESTS_RUN(tests_checksum_crc16_ccitt_mcrf4xx_tests());
     TESTS_RUN(tests_checksum_crc16_ccitt_aug_tests());
     TESTS_RUN(tests_checksum_crc16_ccitt_false_tests());
+    TESTS_RUN(tests_checksum_crc32_tests());
     TESTS_RUN(tests_checksum_fletcher16_tests());
     TESTS_RUN(tests_checksum_fletcher32_tests());
     TESTS_RUN(tests_checksum_ucrc16_tests());

tests/unittests/tests-checksum/tests-checksum.h

@@ -64,6 +64,13 @@ Test *tests_checksum_crc16_ccitt_false_tests(void);
  */
 Test *tests_checksum_crc16_ccitt_aug_tests(void);
 
+/**
+ * @brief   Generates tests for checksum/crc32.h
+ *
+ * @return  embUnit tests if successful, NULL if not.
+ */
+Test *tests_checksum_crc32_tests(void);
+
 /**
  * @brief   Generates tests for checksum/fletcher16.h
  *