Fix displaying empty arrays

Closes #145

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/display-tricky.rs b/tests/display-tricky.rs
new file mode 100644
index 0000000..069e0f9
--- /dev/null
+++ b/tests/display-tricky.rs
@@ -0,0 +1,49 @@
+extern crate toml;
+#[macro_use] extern crate serde_derive;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Recipe {
+    pub name: String,
+    pub description: Option<String>,
+    #[serde(default)]
+    pub modules: Vec<Modules>,
+    #[serde(default)]
+    pub packages: Vec<Packages>
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Modules {
+    pub name: String,
+    pub version: Option<String>
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Packages {
+    pub name: String,
+    pub version: Option<String>
+}
+
+#[test]
+fn both_ends() {
+    let recipe_works = toml::from_str::<Recipe>(r#"
+        name = "testing"
+        description = "example"
+        modules = []
+
+        [[packages]]
+        name = "base"
+    "#).unwrap();
+    toml::to_string(&recipe_works).unwrap();
+
+    let recipe_fails = toml::from_str::<Recipe>(r#"
+        name = "testing"
+        description = "example"
+        packages = []
+
+        [[modules]]
+        name = "base"
+    "#).unwrap();
+
+    let recipe_toml = toml::Value::try_from(recipe_fails).unwrap();
+    recipe_toml.to_string();
+}