A simple, small calculator placed discreetly near the Windows Taskbar or anywhere on the screen
test: add calc engine harness and arithmetic characterization tests
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
authored by
Marco Maroni
Claude Opus 4.8 (1M context)
and committed by
Tangled
(Jul 15, 2026, 1:16 PM +0300)
51f1152c
35cee616
+104
+2
.gitignore
+2
.gitignore
+65
tests/CalcTests.cpp
+65
tests/CalcTests.cpp
···
1
+
#include <windows.h>
2
+
#include <tchar.h>
3
+
#include "../Calculator.h"
4
+
#include "TestHarness.h"
5
+
6
+
// Feed a sequence of command chars through the engine, threading the
7
+
// output string back in as the next input (as the UI does).
8
+
static void feed(calc& c, const wchar_t* keys, wchar_t* out) {
9
+
wcscpy(out, L"0");
10
+
wchar_t in[1024];
11
+
for (const wchar_t* p = keys; *p; ++p) {
12
+
wcscpy(in, out);
13
+
c.change_state(*p, in, out);
14
+
}
15
+
}
16
+
17
+
TEST(add) {
18
+
calc c; c.set_precision(2);
19
+
wchar_t out[1024];
20
+
feed(c, L"2+3=", out);
21
+
EXPECT_WSTR(out, L"5");
22
+
return true;
23
+
}
24
+
25
+
TEST(subtract) {
26
+
calc c; c.set_precision(2);
27
+
wchar_t out[1024];
28
+
feed(c, L"7-2=", out);
29
+
EXPECT_WSTR(out, L"5");
30
+
return true;
31
+
}
32
+
33
+
TEST(multiply) {
34
+
calc c; c.set_precision(2);
35
+
wchar_t out[1024];
36
+
feed(c, L"6*7=", out);
37
+
EXPECT_WSTR(out, L"42");
38
+
return true;
39
+
}
40
+
41
+
TEST(divide) {
42
+
calc c; c.set_precision(2);
43
+
wchar_t out[1024];
44
+
feed(c, L"8/2=", out);
45
+
EXPECT_WSTR(out, L"4");
46
+
return true;
47
+
}
48
+
49
+
TEST(decimal_and_add) {
50
+
calc c; c.set_precision(2);
51
+
wchar_t out[1024];
52
+
feed(c, L"1.5+1.5=", out);
53
+
EXPECT_WSTR(out, L"3");
54
+
return true;
55
+
}
56
+
57
+
TEST(chained_operations) {
58
+
calc c; c.set_precision(2);
59
+
wchar_t out[1024];
60
+
feed(c, L"2+3+4=", out);
61
+
EXPECT_WSTR(out, L"9");
62
+
return true;
63
+
}
64
+
65
+
int wmain() { return run_all(); }
+31
tests/TestHarness.h
+31
tests/TestHarness.h
···
1
+
#pragma once
2
+
#include <cstdio>
3
+
#include <cwchar>
4
+
#include <vector>
5
+
#include <functional>
6
+
7
+
struct TestCase { const char* name; std::function<bool()> fn; };
8
+
inline std::vector<TestCase>& registry() { static std::vector<TestCase> r; return r; }
9
+
struct Registrar { Registrar(const char* n, std::function<bool()> f) { registry().push_back({ n, f }); } };
10
+
11
+
#define TEST(name) \
12
+
static bool name(); \
13
+
static Registrar reg_##name(#name, name); \
14
+
static bool name()
15
+
16
+
#define EXPECT_WSTR(actual, expected) do { \
17
+
if (wcscmp((actual), (expected)) != 0) { \
18
+
wprintf(L" expected [%s] got [%s]\n", (expected), (actual)); return false; } \
19
+
} while(0)
20
+
21
+
inline int run_all() {
22
+
int failed = 0;
23
+
for (auto& tc : registry()) {
24
+
bool ok = false;
25
+
try { ok = tc.fn(); } catch (...) { ok = false; }
26
+
printf("[%s] %s\n", ok ? "PASS" : "FAIL", tc.name);
27
+
if (!ok) failed++;
28
+
}
29
+
printf("\n%d/%d passed\n", (int)registry().size() - failed, (int)registry().size());
30
+
return failed ? 1 : 0;
31
+
}