rustdoc-json: Add tests for variant ordering.

Author: aDotInTheVoid

tests/rustdoc-json/enums/variant_order.rs

@@ -0,0 +1,38 @@
+// Check that the order of variants is preserved.
+
+pub enum Foo {
+    // Important: random prefixes are used here to ensure that
+    // sorting fields by name would cause this test to fail.
+    Ews0,
+    Dik1,
+    Hsk2,
+    Djt3,
+    Jnr4,
+    Dfs5,
+    Bja6,
+    Lyc7,
+    Yqd8,
+    Vll9,
+}
+
+// @set 0 = '$.index[*][?(@.name == "Ews0")].id'
+// @set 1 = '$.index[*][?(@.name == "Dik1")].id'
+// @set 2 = '$.index[*][?(@.name == "Hsk2")].id'
+// @set 3 = '$.index[*][?(@.name == "Djt3")].id'
+// @set 4 = '$.index[*][?(@.name == "Jnr4")].id'
+// @set 5 = '$.index[*][?(@.name == "Dfs5")].id'
+// @set 6 = '$.index[*][?(@.name == "Bja6")].id'
+// @set 7 = '$.index[*][?(@.name == "Lyc7")].id'
+// @set 8 = '$.index[*][?(@.name == "Yqd8")].id'
+// @set 9 = '$.index[*][?(@.name == "Vll9")].id'
+
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[0]' $0
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[1]' $1
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[2]' $2
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[3]' $3
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[4]' $4
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[5]' $5
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[6]' $6
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[7]' $7
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[8]' $8
+// @is '$.index[*][?(@.name == "Foo")].inner.variants[9]' $9