2 files changed, 18 insertions, 0 deletions
diff --git a/tests/invalid-encoder-misc.rs b/tests/invalid-encoder-misc.rs
new file mode 100644
index 0000000..272f58f
--- /dev/null
+++ b/tests/invalid-encoder-misc.rs
@@ -0,0 +1,14 @@
+extern crate toml;
+
+use std::f64;
+
+#[test]
+fn test_invalid_float_encode() {
+    fn bad(value: toml::Value) {
+        assert!(toml::to_string(&value).is_err());
+    }
+
+    bad(toml::Value::Float(f64::INFINITY));
+    bad(toml::Value::Float(f64::NEG_INFINITY));
+    bad(toml::Value::Float(f64::NAN));
+}
diff --git a/tests/invalid-misc.rs b/tests/invalid-misc.rs
index 53f625e..bb70b97 100644
--- a/tests/invalid-misc.rs
+++ b/tests/invalid-misc.rs
@@ -10,4 +10,8 @@ fn bad() {
     bad("a = 1__1");
     bad("a = 1_");
     bad("''");
+    bad("a = nan");
+    bad("a = -inf");
+    bad("a = inf");
+    bad("a = 9e99999");
 }