1 /* $NetBSD: sfptostr.c,v 1.2 2020/05/25 20:47:36 christos Exp $ */
2
3 /*
4 * This file contains test for both fptoa and fptoms (which uses dofptoa),
5 * since all these functions are very similar.
6 */
7 #include "config.h"
8 #include "ntp_fp.h"
9 #include "ntp_stdlib.h"
10 #include "unity.h"
11
12 #define SFP_MAX_PRECISION 6
13
14 void setUp(void);
15 void test_PositiveInteger(void);
16 void test_NegativeInteger(void);
17 void test_PositiveIntegerPositiveFraction(void);
18 void test_NegativeIntegerNegativeFraction(void);
19 void test_PositiveIntegerNegativeFraction(void);
20 void test_NegativeIntegerPositiveFraction(void);
21 void test_SingleDecimalInteger(void);
22 void test_SingleDecimalRounding(void);
23
24
25 void
setUp(void)26 setUp(void)
27 {
28 init_lib();
29
30 return;
31 }
32
33
test_PositiveInteger(void)34 void test_PositiveInteger(void)
35 {
36 s_fp test = 300 << 16; // exact 300.000000
37
38 TEST_ASSERT_EQUAL_STRING("300.000000", fptoa(test, SFP_MAX_PRECISION));
39 TEST_ASSERT_EQUAL_STRING("300000.000", fptoms(test, SFP_MAX_PRECISION));
40 }
41
test_NegativeInteger(void)42 void test_NegativeInteger(void)
43 {
44 s_fp test = -(200 << 16); // exact -200.000000
45
46 TEST_ASSERT_EQUAL_STRING("-200.000000", fptoa(test, SFP_MAX_PRECISION));
47 TEST_ASSERT_EQUAL_STRING("-200000.000", fptoms(test, SFP_MAX_PRECISION));
48 }
49
test_PositiveIntegerPositiveFraction(void)50 void test_PositiveIntegerPositiveFraction(void)
51 {
52 s_fp test = (300 << 16) + (1 << 15); // 300 + 0.5
53
54 TEST_ASSERT_EQUAL_STRING("300.500000", fptoa(test, SFP_MAX_PRECISION));
55 TEST_ASSERT_EQUAL_STRING("300500.000", fptoms(test, SFP_MAX_PRECISION));
56 }
57
test_NegativeIntegerNegativeFraction(void)58 void test_NegativeIntegerNegativeFraction(void)
59 {
60 s_fp test = -(200 << 16) - (1 << 15); // -200 - 0.5
61
62 TEST_ASSERT_EQUAL_STRING("-200.500000", fptoa(test, SFP_MAX_PRECISION));
63 TEST_ASSERT_EQUAL_STRING("-200500.000", fptoms(test, SFP_MAX_PRECISION));
64 }
65
test_PositiveIntegerNegativeFraction(void)66 void test_PositiveIntegerNegativeFraction(void)
67 {
68 s_fp test = (300 << 16) - (1 << 14); // 300 - 0.25
69
70 TEST_ASSERT_EQUAL_STRING("299.750000", fptoa(test, SFP_MAX_PRECISION));
71 TEST_ASSERT_EQUAL_STRING("299750.000", fptoms(test, SFP_MAX_PRECISION));
72 }
73
test_NegativeIntegerPositiveFraction(void)74 void test_NegativeIntegerPositiveFraction(void)
75 {
76 s_fp test = -(200 << 16) + (1 << 14)*3; // -200 + 0.75
77
78 TEST_ASSERT_EQUAL_STRING("-199.250000", fptoa(test, SFP_MAX_PRECISION));
79 TEST_ASSERT_EQUAL_STRING("-199250.000", fptoms(test, SFP_MAX_PRECISION));
80 }
81
test_SingleDecimalInteger(void)82 void test_SingleDecimalInteger(void)
83 {
84 s_fp test = 300 << 16; // 300
85
86 TEST_ASSERT_EQUAL_STRING("300.0", fptoa(test, 1));
87 TEST_ASSERT_EQUAL_STRING("300000.0", fptoms(test, 1));
88 }
89
test_SingleDecimalRounding(void)90 void test_SingleDecimalRounding(void)
91 {
92 s_fp test = (2 << 16) + (1 << 14)*3; // 2 + 0.25*3 = 2.75
93
94 TEST_ASSERT_EQUAL_STRING("2.8", fptoa(test, 1));
95 TEST_ASSERT_EQUAL_STRING("2750.0", fptoms(test, 1));
96 }
97