Derive JsonSchema_repr (#76)

schemars/tests/enum_repr.rs

@@ -0,0 +1,35 @@
+mod util;
+use schemars::JsonSchema_repr;
+use util::*;
+
+#[derive(JsonSchema_repr)]
+#[repr(u8)]
+pub enum Enum {
+    Zero,
+    One,
+    Five = 5,
+    Six,
+    Three = 3,
+}
+
+#[test]
+fn enum_repr() -> TestResult {
+    test_default_generated_schema::<Enum>("enum-repr")
+}
+
+#[derive(JsonSchema_repr)]
+#[repr(i64)]
+#[serde(rename = "Renamed")]
+/// Description from comment
+pub enum EnumWithAttrs {
+    Zero,
+    One,
+    Five = 5,
+    Six,
+    Three = 3,
+}
+
+#[test]
+fn enum_repr_with_attrs() -> TestResult {
+    test_default_generated_schema::<EnumWithAttrs>("enum-repr-with-attrs")
+}

schemars/tests/expected/enum-repr-with-attrs.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Renamed",
+  "description": "Description from comment",
+  "type": "integer",
+  "enum": [
+    0,
+    1,
+    5,
+    6,
+    3
+  ]
+}

schemars/tests/expected/enum-repr.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Enum",
+  "type": "integer",
+  "enum": [
+    0,
+    1,
+    5,
+    6,
+    3
+  ]
+}

schemars/tests/ui/repr_missing.rs

@@ -0,0 +1,8 @@
+use schemars::JsonSchema_repr;
+
+#[derive(JsonSchema_repr)]
+pub enum Enum {
+    Unit,
+}
+
+fn main() {}

schemars/tests/ui/repr_missing.stderr

@@ -0,0 +1,7 @@
+error: JsonSchema_repr: missing #[repr(...)] attribute
+ --> $DIR/repr_missing.rs:3:10
+  |
+3 | #[derive(JsonSchema_repr)]
+  |          ^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

schemars/tests/ui/repr_non_unit_variant.rs

@@ -0,0 +1,10 @@
+use schemars::JsonSchema_repr;
+
+#[derive(JsonSchema_repr)]
+#[repr(u8)]
+pub enum Enum {
+    Unit,
+    EmptyTuple(),
+}
+
+fn main() {}

schemars/tests/ui/repr_non_unit_variant.stderr

@@ -0,0 +1,5 @@
+error: JsonSchema_repr: must be a unit variant
+ --> $DIR/repr_non_unit_variant.rs:7:5
+  |
+7 |     EmptyTuple(),
+  |     ^^^^^^^^^^