1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/rust/dtoa/tests/test.rs b/third_party/rust/dtoa/tests/test.rs
new file mode 100644
index 0000000000..4f92d7ee13
--- /dev/null
+++ b/third_party/rust/dtoa/tests/test.rs
@@ -0,0 +1,38 @@
+extern crate dtoa;
+
+use std::str;
+
+#[test]
+fn test_f64() {
+    test_write(1.234e20f64, "123400000000000000000.0");
+    test_write(1.234e21f64, "1.234e21");
+    test_write(2.71828f64, "2.71828");
+    test_write(0.0f64, "0.0");
+    test_write(-0.0f64, "-0.0");
+    test_write(1.1e128f64, "1.1e128");
+    test_write(1.1e-64f64, "1.1e-64");
+    test_write(2.718281828459045f64, "2.718281828459045");
+    test_write(5e-324f64, "5e-324");
+    test_write(::std::f64::MAX, "1.7976931348623157e308");
+}
+
+#[test]
+fn test_f32() {
+    test_write(1.234e20f32, "123400000000000000000.0");
+    test_write(1.234e21f32, "1.234e21");
+    test_write(2.71828f32, "2.71828");
+    test_write(0.0f32, "0.0");
+    test_write(-0.0f32, "-0.0");
+    test_write(1.1e32f32, "1.1e32");
+    test_write(1.1e-32f32, "1.1e-32");
+    test_write(2.7182817f32, "2.7182817");
+    test_write(1e-45f32, "1e-45");
+    test_write(::std::f32::MAX, "3.4028235e38");
+}
+
+fn test_write<F: dtoa::Floating>(value: F, expected: &'static str) {
+    let mut buf = [b'\0'; 30];
+    let len = dtoa::write(&mut buf[..], value).unwrap();
+    let result = str::from_utf8(&buf[..len]).unwrap();
+    assert_eq!(result, expected.to_string());
+}