test: Add test for json filter

Cargo.lock

@@ -48,6 +48,7 @@ dependencies = [
  "sailfish",
  "sailfish-compiler",
  "sailfish-macros",
+ "serde_json",
  "trybuild",
 ]
 

sailfish-tests/integration-tests/Cargo.toml

@@ -6,9 +6,10 @@ edition = "2018"
 publish = false
 
 [dependencies]
-sailfish = { path = "../../sailfish", default-features = false }
+sailfish = { path = "../../sailfish", default-features = false, features = ["json"] }
 sailfish-macros = { path = "../../sailfish-macros" }
 sailfish-compiler = { path = "../../sailfish-compiler" }
+serde_json = "1.0.60"
 
 [dev-dependencies]
 trybuild = "1.0.28"

sailfish-tests/integration-tests/templates/json-filter.out

@@ -0,0 +1,4 @@
+{
+    "name": "JSON test",
+    "data": {"age":43,"name":"John Doe","phones":["+44 1234567","+44 2345678"]}
+}

sailfish-tests/integration-tests/templates/json-filter.stpl

@@ -0,0 +1,4 @@
+{
+    "name": "JSON test",
+    "data": <%- data | json %>
+}

sailfish-tests/integration-tests/tests/template_once.rs

@@ -290,6 +290,26 @@ fn test_filter() {
     assert_render("filter", Filter { message: "hello" });
 }
 
+#[derive(TemplateOnce)]
+#[template(path = "json-filter.stpl")]
+struct JsonFilter {
+    data: serde_json::Value,
+}
+
+#[test]
+fn test_json_filter() {
+    let data = serde_json::json!({
+        "name": "John Doe",
+        "age": 43,
+        "phones": [
+            "+44 1234567",
+            "+44 2345678"
+        ]
+    });
+
+    assert_render("json-filter", JsonFilter { data });
+}
+
 #[cfg(unix)]
 mod unix {
     use super::*;