Implement JsonSchema on smallvec + arrayvec types

Documentation still needs updating.

schemars/tests/arrayvec.rs

@@ -0,0 +1,13 @@
+mod util;
+use arrayvec::{ArrayString, ArrayVec};
+use util::*;
+
+#[test]
+fn arrayvec() -> TestResult {
+    test_default_generated_schema::<ArrayVec::<[i32; 16]>>("arrayvec")
+}
+
+#[test]
+fn arrayvec_string() -> TestResult {
+    test_default_generated_schema::<ArrayString::<[u8; 16]>>("arrayvec_string")
+}

schemars/tests/expected/arrayvec.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Array_up_to_size_16_of_int32",
+  "type": "array",
+  "items": {
+    "type": "integer",
+    "format": "int32"
+  },
+  "maxItems": 16
+}

schemars/tests/expected/arrayvec_string.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "String",
+  "type": "string"
+}

schemars/tests/expected/smallvec.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Array_of_String",
+  "type": "array",
+  "items": {
+    "type": "string"
+  }
+}

schemars/tests/smallvec.rs

@@ -0,0 +1,8 @@
+mod util;
+use smallvec::SmallVec;
+use util::*;
+
+#[test]
+fn smallvec() -> TestResult {
+    test_default_generated_schema::<SmallVec<[String; 2]>>("smallvec")
+}