1 files changed, 110 insertions, 0 deletions
diff --git a/asl/formatting/format_tests.cpp b/asl/formatting/format_tests.cpp
new file mode 100644
index 0000000..96ed7d0
--- /dev/null
+++ b/asl/formatting/format_tests.cpp
@@ -0,0 +1,110 @@
+#include "asl/formatting/format.hpp"
+#include "asl/testing/testing.hpp"
+#include "asl/base/float.hpp"
+#include "asl/strings/string_builder.hpp"
+
+static_assert(asl::formattable<decltype("Hello")>);
+
+ASL_TEST(format_args)
+{
+    // @Todo Introduce ASL_TEST_EXPECT_EQ, or ASL_TEST_EXPECT_STREQ
+
+    auto s = asl::format_to_string("Hello, world!");
+    ASL_TEST_EXPECT(s == "Hello, world!"_sv);
+
+    s = asl::format_to_string("");
+    ASL_TEST_EXPECT(s == ""_sv);
+
+    s = asl::format_to_string("Hello, {}!", "world");
+    ASL_TEST_EXPECT(s == "Hello, world!"_sv);
+
+    s = asl::format_to_string("Hello, {}! {}", "world");
+    ASL_TEST_EXPECT(s == "Hello, world! <ERROR>"_sv);
+
+    s = asl::format_to_string("Hello, pup!", "world");
+    ASL_TEST_EXPECT(s == "Hello, pup!"_sv);
+
+    s = asl::format_to_string("{}", "CHEESE");
+    ASL_TEST_EXPECT(s == "CHEESE"_sv);
+
+    s = asl::format_to_string("{   ", "CHEESE");
+    ASL_TEST_EXPECT(s == "<ERROR>   "_sv);
+
+    s = asl::format_to_string("{", "CHEESE");
+    ASL_TEST_EXPECT(s == "<ERROR>"_sv);
+
+    s = asl::format_to_string("a{{b");
+    ASL_TEST_EXPECT(s == "a{b"_sv);
+
+    s = asl::format_to_string("{{{}}} }", "CHEESE");
+    ASL_TEST_EXPECT(s == "{CHEESE} }"_sv);
+}
+
+ASL_TEST(format_integers)
+{
+    auto s = asl::format_to_string("{} {} {}", 0, 1, 2);
+    ASL_TEST_EXPECT(s == "0 1 2"_sv);
+
+    s = asl::format_to_string("{} {} {}", 10, 11, 12);
+    ASL_TEST_EXPECT(s == "10 11 12"_sv);
+
+    s = asl::format_to_string("{} {} {}", 100, 101, 102);
+    ASL_TEST_EXPECT(s == "100 101 102"_sv);
+
+    s = asl::format_to_string("{} {} {}", 1000, 1001, 1002);
+    ASL_TEST_EXPECT(s == "1000 1001 1002"_sv);
+
+    s = asl::format_to_string("{} {} {} {}", -1, -23, -456, -7890);
+    ASL_TEST_EXPECT(s == "-1 -23 -456 -7890"_sv);
+}
+
+ASL_TEST(format_floats)
+{
+    auto s = asl::format_to_string("{} {} {}", 0.0F, 1.0, 2.0F);
+    ASL_TEST_EXPECT(s == "0 1 2"_sv);
+
+    s = asl::format_to_string("{} {} {}", 0.1F, 0.001F, 0.123F);
+    ASL_TEST_EXPECT(s == "0.1 0.001 0.123"_sv);
+
+    s = asl::format_to_string("{} {}", 1.25F, -22.3);
+    ASL_TEST_EXPECT(s == "1.25 -22.3"_sv);
+
+    s = asl::format_to_string("{}", 1e32);
+    ASL_TEST_EXPECT(s == "100000000000000000000000000000000"_sv);
+
+    s = asl::format_to_string("{}", 123e-8);
+    ASL_TEST_EXPECT(s == "0.00000123"_sv);
+
+    s = asl::format_to_string("{} {}", asl::infinity<float>(), -asl::infinity<double>());
+    ASL_TEST_EXPECT(s == "Infinity -Infinity"_sv);
+
+    s = asl::format_to_string("{}", asl::nan<float>());
+    ASL_TEST_EXPECT(s == "NaN"_sv);
+}
+
+ASL_TEST(format_boolean)
+{
+    auto s = asl::format_to_string("{} {}", true, false);
+    ASL_TEST_EXPECT(s == "true false"_sv);
+}
+
+struct CustomFormat
+{
+    int x;
+    friend void AslFormat(asl::Formatter&, const CustomFormat&);
+};
+
+void AslFormat(asl::Formatter& f, const CustomFormat& c)
+{
+    f.write("("_sv);
+    AslFormat(f, c.x);
+    f.write(")"_sv);
+}
+
+static_assert(asl::formattable<CustomFormat>);
+
+ASL_TEST(format_custom)
+{
+    auto s = asl::format_to_string("{}", CustomFormat{37});
+    ASL_TEST_EXPECT(s == "(37)"_sv);
+}