1 files changed, 125 insertions, 0 deletions
diff --git a/tests/libntp/lfptostr.c b/tests/libntp/lfptostr.c
new file mode 100644
index 0000000000000..142e6c772ebb4
--- /dev/null
+++ b/tests/libntp/lfptostr.c
@@ -0,0 +1,125 @@
+/* 
+ * This file contains test for both mfptoa and mfptoms (which uses dolfptoa),
+ * since all these functions are very similar. It also tests ulfptoa, which is
+ * a macro.
+ */
+
+#include "config.h"
+#include "ntp_stdlib.h"
+#include "ntp_fp.h"
+
+#include "unity.h"
+
+static const int LFP_MAX_PRECISION = 10;
+static const int LFP_MAX_PRECISION_MS = 7;
+
+static const int ONE_FOURTH = 1073741824; /* (1 << 30) */
+static const int HALF = (1 << 31);
+static const int THREE_FOURTH = -1073741824;
+static const int HALF_PROMILLE_UP = 2147484; /* slightly more than 0.0005 */
+static const int HALF_PROMILLE_DOWN = 2147483; /* slightly less than 0.0005 */
+
+
+void test_PositiveInteger(void);
+void test_NegativeInteger(void);
+void test_PositiveIntegerWithFraction(void);
+void test_NegativeIntegerWithFraction(void);
+void test_RoundingDownToInteger(void);
+void test_RoundingMiddleToInteger(void);
+void test_RoundingUpToInteger(void);
+void test_SingleDecimal(void);
+void test_MillisecondsRoundingUp(void);
+void test_MillisecondsRoundingDown(void);
+void test_UnsignedInteger(void);
+
+
+
+void
+test_PositiveInteger(void) {
+	l_fp test = {{200}, 0}; /* exact 200.0000000000 */
+
+	TEST_ASSERT_EQUAL_STRING("200.0000000000", mfptoa(test.l_ui, test.l_uf, LFP_MAX_PRECISION));
+	TEST_ASSERT_EQUAL_STRING("200000.0000000", mfptoms(test.l_ui, test.l_uf, LFP_MAX_PRECISION_MS));
+}
+
+void
+test_NegativeInteger(void) {
+	l_fp test = {{-100}, 0}; /* -100 */
+
+	TEST_ASSERT_EQUAL_STRING("-100.0000000000", lfptoa(&test, LFP_MAX_PRECISION));
+	TEST_ASSERT_EQUAL_STRING("-100000.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
+}
+
+void
+test_PositiveIntegerWithFraction(void) {
+	l_fp test = {{200}, ONE_FOURTH}; /* 200.25 */
+
+	TEST_ASSERT_EQUAL_STRING("200.2500000000", lfptoa(&test, LFP_MAX_PRECISION));
+	TEST_ASSERT_EQUAL_STRING("200250.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
+}
+
+void
+test_NegativeIntegerWithFraction(void) {
+	l_fp test = {{-100}, ONE_FOURTH}; /* -99.75 */
+
+	TEST_ASSERT_EQUAL_STRING("-99.7500000000", lfptoa(&test, LFP_MAX_PRECISION));
+	TEST_ASSERT_EQUAL_STRING("-99750.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
+}
+
+void
+test_RoundingDownToInteger(void) {
+	l_fp test = {{10}, ONE_FOURTH}; /* 10.25 */
+
+	TEST_ASSERT_EQUAL_STRING("10", lfptoa(&test, 0));
+	TEST_ASSERT_EQUAL_STRING("10250", lfptoms(&test, 0));
+}
+
+void
+test_RoundingMiddleToInteger(void) {
+	l_fp test = {{10}, HALF}; /* 10.5 */
+
+	TEST_ASSERT_EQUAL_STRING("11", lfptoa(&test, 0));
+	TEST_ASSERT_EQUAL_STRING("10500", lfptoms(&test, 0));
+}
+
+void
+test_RoundingUpToInteger(void) {
+	l_fp test = {{5}, THREE_FOURTH}; /* 5.75 */
+
+	TEST_ASSERT_EQUAL_STRING("6", lfptoa(&test, 0));
+	TEST_ASSERT_EQUAL_STRING("5750", lfptoms(&test, 0));
+}
+
+void
+test_SingleDecimal(void) {
+	l_fp test = {{8}, ONE_FOURTH}; /* 8.25 */
+
+	TEST_ASSERT_EQUAL_STRING("8.3", lfptoa(&test, 1));
+	TEST_ASSERT_EQUAL_STRING("8250.0", lfptoms(&test, 1));
+}
+
+void
+test_MillisecondsRoundingUp(void) {
+	l_fp test = {{1}, HALF_PROMILLE_UP}; /* slightly more than 1.0005 */
+
+	TEST_ASSERT_EQUAL_STRING("1.0", lfptoa(&test, 1));
+
+	TEST_ASSERT_EQUAL_STRING("1000.5", lfptoms(&test, 1));
+	TEST_ASSERT_EQUAL_STRING("1001", lfptoms(&test, 0));
+}
+
+void
+test_MillisecondsRoundingDown(void) {
+	l_fp test = {{1}, HALF_PROMILLE_DOWN}; /* slightly less than 1.0005 */
+
+	TEST_ASSERT_EQUAL_STRING("1.0", lfptoa(&test, 1));
+
+	TEST_ASSERT_EQUAL_STRING("1000.5", lfptoms(&test, 1));
+	TEST_ASSERT_EQUAL_STRING("1000", lfptoms(&test, 0));
+}
+
+void test_UnsignedInteger(void) {
+	l_fp test = {{3000000000UL}, 0};
+
+	TEST_ASSERT_EQUAL_STRING("3000000000.0", ulfptoa(&test, 1));
+}