1 files changed, 82 insertions, 0 deletions
diff --git a/asl/format_tests.cpp b/asl/format_tests.cpp
index e69de29..2288a77 100644
--- a/asl/format_tests.cpp
+++ b/asl/format_tests.cpp
@@ -0,0 +1,82 @@
+#include "asl/format.hpp"
+
+#include <cstdlib>
+#include <cstring>
+#include <cassert>
+#include <cstdio>
+
+// @Todo Improve this to use our utilities, not the C stdlib
+
+static_assert(asl::formattable<decltype("Hello")>);
+
+class StringSink : public asl::writer
+{
+    int64_t m_current_len{};
+    char*   m_data{};
+    
+public:
+    void write(const char* str, int64_t len) override
+    {
+        m_data = (char*)realloc(m_data, (size_t)(m_current_len + len + 1));
+        memcpy(m_data + m_current_len, str, (size_t)len);
+        m_current_len += len;
+        m_data[m_current_len] = '\0';
+    }
+
+    constexpr const char* cstr() const { return m_data; }
+
+    void reset()
+    {
+        m_current_len = 0;
+        free(m_data);
+        m_data = nullptr;
+    }
+};
+
+int main()
+{
+    StringSink sink;
+
+    // @Todo Use the testing framework
+
+    asl::format(&sink, "Hello, world!");
+    assert(strcmp(sink.cstr(), "Hello, world!") == 0);
+
+    sink.reset();
+    asl::format(&sink, "");
+    assert(strcmp(sink.cstr(), "") == 0);
+
+    sink.reset();
+    asl::format(&sink, "Hello, {}!", "world");
+    assert(strcmp(sink.cstr(), "Hello, world!") == 0);
+
+    sink.reset();
+    asl::format(&sink, "Hello, {}! {}", "world");
+    assert(strcmp(sink.cstr(), "Hello, world! <ERROR>") == 0);
+
+    sink.reset();
+    asl::format(&sink, "Hello, pup!", "world");
+    assert(strcmp(sink.cstr(), "Hello, pup!") == 0);
+
+    sink.reset();
+    asl::format(&sink, "{}", "CHEESE");
+    assert(strcmp(sink.cstr(), "CHEESE") == 0);
+
+    sink.reset();
+    asl::format(&sink, "{   ", "CHEESE");
+    assert(strcmp(sink.cstr(), "<ERROR>   ") == 0);
+
+    sink.reset();
+    asl::format(&sink, "{", "CHEESE");
+    assert(strcmp(sink.cstr(), "<ERROR>") == 0);
+
+    sink.reset();
+    asl::format(&sink, "a{{b");
+    assert(strcmp(sink.cstr(), "a{b") == 0);
+
+    sink.reset();
+    asl::format(&sink, "{{{}}} }", "CHEESE");
+    assert(strcmp(sink.cstr(), "{CHEESE} }") == 0);
+
+    return 0;
+}