Merge pull request #264 from azriel91/feature/225/externally-tagged-enums

Issue 255: Externally tagged enum deserialization

1 files changed, 238 insertions, 0 deletions

diff --git a/tests/enum_external_deserialize.rs b/tests/enum_external_deserialize.rs
new file mode 100644
index 0000000..3c38580
--- /dev/null
+++ b/tests/enum_external_deserialize.rs
@@ -0,0 +1,238 @@
+#[macro_use]
+extern crate serde_derive;
+extern crate toml;
+
+#[derive(Debug, Deserialize, PartialEq)]
+enum TheEnum {
+    Plain,
+    Tuple(i64, bool),
+    NewType(String),
+    Struct { value: i64 },
+}
+
+#[derive(Debug, Deserialize, PartialEq)]
+struct Val {
+    val: TheEnum,
+}
+
+#[derive(Debug, Deserialize, PartialEq)]
+struct Multi {
+    enums: Vec<TheEnum>,
+}
+
+#[test]
+fn invalid_variant_returns_error_with_good_message_string() {
+    let error = toml::from_str::<TheEnum>("\"NonExistent\"").unwrap_err();
+
+    assert_eq!(
+        error.to_string(),
+        "unknown variant `NonExistent`, expected one of `Plain`, `Tuple`, `NewType`, `Struct`"
+    );
+}
+
+#[test]
+fn invalid_variant_returns_error_with_good_message_inline_table() {
+    let error = toml::from_str::<TheEnum>("{ NonExistent = {} }").unwrap_err();
+    assert_eq!(
+        error.to_string(),
+        "unknown variant `NonExistent`, expected one of `Plain`, `Tuple`, `NewType`, `Struct`"
+    );
+}
+
+#[test]
+fn extra_field_returns_expected_empty_table_error() {
+    let error = toml::from_str::<TheEnum>("{ Plain = { extra_field = 404 } }").unwrap_err();
+
+    assert_eq!(error.to_string(), "expected empty table");
+}
+
+#[test]
+fn extra_field_returns_expected_empty_table_error_struct_variant() {
+    let error = toml::from_str::<TheEnum>("{ Struct = { value = 123, extra_0 = 0, extra_1 = 1 } }")
+        .unwrap_err();
+
+    assert_eq!(
+        error.to_string(),
+        r#"unexpected keys in table: `["extra_0", "extra_1"]`, available keys: `["value"]`"#
+    );
+}
+
+mod enum_unit {
+    use super::*;
+
+    #[test]
+    fn from_str() {
+        assert_eq!(TheEnum::Plain, toml::from_str("\"Plain\"").unwrap());
+    }
+
+    #[test]
+    fn from_inline_table() {
+        assert_eq!(TheEnum::Plain, toml::from_str("{ Plain = {} }").unwrap());
+        assert_eq!(
+            Val {
+                val: TheEnum::Plain
+            },
+            toml::from_str("val = { Plain = {} }").unwrap()
+        );
+    }
+
+    #[test]
+    fn from_dotted_table() {
+        assert_eq!(TheEnum::Plain, toml::from_str("[Plain]\n").unwrap());
+    }
+}
+
+mod enum_tuple {
+    use super::*;
+
+    #[test]
+    fn from_inline_table() {
+        assert_eq!(
+            TheEnum::Tuple(-123, true),
+            toml::from_str("{ Tuple = { 0 = -123, 1 = true } }").unwrap()
+        );
+        assert_eq!(
+            Val {
+                val: TheEnum::Tuple(-123, true)
+            },
+            toml::from_str("val = { Tuple = { 0 = -123, 1 = true } }").unwrap()
+        );
+    }
+
+    #[test]
+    fn from_dotted_table() {
+        assert_eq!(
+            TheEnum::Tuple(-123, true),
+            toml::from_str(
+                r#"[Tuple]
+                0 = -123
+                1 = true
+                "#
+            )
+            .unwrap()
+        );
+    }
+}
+
+mod enum_newtype {
+    use super::*;
+
+    #[test]
+    fn from_inline_table() {
+        assert_eq!(
+            TheEnum::NewType("value".to_string()),
+            toml::from_str(r#"{ NewType = "value" }"#).unwrap()
+        );
+        assert_eq!(
+            Val {
+                val: TheEnum::NewType("value".to_string()),
+            },
+            toml::from_str(r#"val = { NewType = "value" }"#).unwrap()
+        );
+    }
+
+    #[test]
+    #[ignore = "Unimplemented: https://github.com/alexcrichton/toml-rs/pull/264#issuecomment-431707209"]
+    fn from_dotted_table() {
+        assert_eq!(
+            TheEnum::NewType("value".to_string()),
+            toml::from_str(r#"NewType = "value""#).unwrap()
+        );
+        assert_eq!(
+            Val {
+                val: TheEnum::NewType("value".to_string()),
+            },
+            toml::from_str(
+                r#"[val]
+                NewType = "value"
+                "#
+            )
+            .unwrap()
+        );
+    }
+}
+
+mod enum_struct {
+    use super::*;
+
+    #[test]
+    fn from_inline_table() {
+        assert_eq!(
+            TheEnum::Struct { value: -123 },
+            toml::from_str("{ Struct = { value = -123 } }").unwrap()
+        );
+        assert_eq!(
+            Val {
+                val: TheEnum::Struct { value: -123 }
+            },
+            toml::from_str("val = { Struct = { value = -123 } }").unwrap()
+        );
+    }
+
+    #[test]
+    fn from_dotted_table() {
+        assert_eq!(
+            TheEnum::Struct { value: -123 },
+            toml::from_str(
+                r#"[Struct]
+                value = -123
+                "#
+            )
+            .unwrap()
+        );
+    }
+}
+
+mod enum_array {
+    use super::*;
+
+    #[test]
+    fn from_inline_tables() {
+        let toml_str = r#"
+            enums = [
+                { Plain = {} },
+                { Tuple = { 0 = -123, 1 = true } },
+                { NewType = "value" },
+                { Struct = { value = -123 } }
+            ]"#;
+        assert_eq!(
+            Multi {
+                enums: vec![
+                    TheEnum::Plain,
+                    TheEnum::Tuple(-123, true),
+                    TheEnum::NewType("value".to_string()),
+                    TheEnum::Struct { value: -123 },
+                ]
+            },
+            toml::from_str(toml_str).unwrap()
+        );
+    }
+
+    #[test]
+    #[ignore = "Unimplemented: https://github.com/alexcrichton/toml-rs/pull/264#issuecomment-431707209"]
+    fn from_dotted_table() {
+        let toml_str = r#"[[enums]]
+            Plain = {}
+
+            [[enums]]
+            Tuple = { 0 = -123, 1 = true }
+
+            [[enums]]
+            NewType = "value"
+
+            [[enums]]
+            Struct = { value = -123 }
+            "#;
+        assert_eq!(
+            Multi {
+                enums: vec![
+                    TheEnum::Plain,
+                    TheEnum::Tuple(-123, true),
+                    TheEnum::NewType("value".to_string()),
+                    TheEnum::Struct { value: -123 },
+                ]
+            },
+            toml::from_str(toml_str).unwrap()
+        );
+    }
+}