add additional tests for parent operator

Author: mattmart3

tests/parents.rs

@@ -0,0 +1,162 @@
+#[macro_use]
+extern crate serde_json;
+
+use common::{read_json, select_and_then_compare, setup};
+
+mod common;
+
+#[test]
+fn parent_of_root() {
+    setup();
+
+    for path in &[r#"$^*"#, r#"$^^*"#, r#"$^*^*", r#"$.first^^*"#] {
+        select_and_then_compare(
+            path,
+            json!({"first":"value"}),
+            json!([]),
+        );
+    }
+}
+
+#[test]
+fn parent_key() {
+    setup();
+
+    for path in &[r#"$.store^expensive"#, r#"$.store.bicycle^^expensive"#] {
+        select_and_then_compare(
+            path,
+            read_json("./benchmark/example.json"),
+            json!([10]),
+        );
+    }
+}
+
+#[test]
+fn parent_parent() {
+    setup();
+
+    select_and_then_compare(
+        r#"$.store.bicycle^^expensive"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            10
+        ])
+    );
+
+    select_and_then_compare(
+        r#"$.store.book[0].author^^^bicycle"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            {
+                "color": "red",
+                "price": 19.95
+            }
+        ])
+    );
+}
+
+#[test]
+fn parent_array() {
+    setup();
+
+    select_and_then_compare(
+        r#"$.store.book[1]^[0]"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            {
+                "category": "reference",
+                "author": "Nigel Rees",
+                "title": "Sayings of the Century",
+                "price": 8.95
+            }
+        ])
+    );
+
+    select_and_then_compare(
+        r#"$.store.book[*]^[0]"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            {
+                "category": "reference",
+                "author": "Nigel Rees",
+                "title": "Sayings of the Century",
+                "price": 8.95
+            },
+            {
+                "category": "reference",
+                "author": "Nigel Rees",
+                "title": "Sayings of the Century",
+                "price": 8.95
+            },
+            {
+                "category": "reference",
+                "author": "Nigel Rees",
+                "title": "Sayings of the Century",
+                "price": 8.95
+            },
+            {
+                "category": "reference",
+                "author": "Nigel Rees",
+                "title": "Sayings of the Century",
+                "price": 8.95
+            }
+        ])
+    );
+}
+
+#[test]
+fn parent_all() {
+    setup();
+
+    select_and_then_compare(
+        r#"$.store.bicycle.color^*"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            "red",
+            19.95
+        ])
+    );
+
+    select_and_then_compare(
+        r#"$.store.book[0].category^^*.author"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            "Nigel Rees",
+            "Evelyn Waugh",
+            "Herman Melville",
+            "J. R. R. Tolkien"
+        ])
+    );
+}
+
+#[test]
+fn parent_after_leaves() {
+    setup();
+
+    select_and_then_compare(
+        r#"$..author^title"#,
+        read_json("./benchmark/example.json"),
+        json!([
+            "Sayings of the Century",
+            "Sword of Honour",
+            "Moby Dick",
+            "The Lord of the Rings"
+        ])
+    );
+}
+
+#[test]
+fn parent_after_filter() {
+    setup();
+
+    select_and_then_compare(
+        "$.store.book[?(@.price == 12.99)]^^bicycle",
+        read_json("./benchmark/example.json"),
+        json!([
+            {
+                "color": "red",
+                "price": 19.95
+            }
+        ])
+    );
+}