Add graph container null context protection test.

Author: davidlehn

Diff for: tests/expand-manifest.jsonld

@@ -2843,6 +2843,14 @@
       "option": {"specVersion": "json-ld-1.1"},
       "input": "expand/pr41-in.jsonld",
       "expect": "expand/pr41-out.jsonld"
+    }, {
+      "@id": "#tpr42",
+      "@type": ["jld:PositiveEvaluationTest", "jld:ExpandTest"],
+      "name": "Clear protection in @graph @container with null context.",
+      "purpose": "Clear protection in @graph @container with null context.",
+      "option": {"specVersion": "json-ld-1.1"},
+      "input": "expand/pr42-in.jsonld",
+      "expect": "expand/pr42-out.jsonld"
     }, {
       "@id": "#tso01",
       "@type": ["jld:NegativeEvaluationTest", "jld:ExpandTest"],

Diff for: tests/expand/pr42-in.jsonld

@@ -0,0 +1,23 @@
+{
+  "@context": {
+    "@protected": true,
+    "protected": {
+      "@id": "ex:protected1",
+      "@type": "@id"
+    },
+    "unprotected": {
+      "@id": "ex:unprotected",
+      "@type": "@id",
+      "@container": "@graph",
+      "@context": null
+    }
+  },
+  "@id": "ex:outer",
+  "unprotected": {
+    "@context": {
+      "protected": "ex:protected2"
+    },
+    "@id": "ex:inner",
+    "protected": "p === ex:protected2"
+  }
+}

Diff for: tests/expand/pr42-out.jsonld

@@ -0,0 +1,19 @@
+[
+  {
+    "@id": "ex:outer",
+    "ex:unprotected": [
+      {
+        "@graph": [
+          {
+            "@id": "ex:inner",
+            "ex:protected2": [
+              {
+                "@value": "p === ex:protected2"
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+]

Diff for: tests/toRdf-manifest.jsonld

@@ -3372,6 +3372,14 @@
       "option": {"specVersion": "json-ld-1.1"},
       "input": "toRdf/pr41-in.jsonld",
       "expect": "toRdf/pr41-out.nq"
+    }, {
+      "@id": "#tpr42",
+      "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],
+      "name": "Clear protection in @graph @container with null context.",
+      "purpose": "Clear protection in @graph @container with null context.",
+      "option": {"specVersion": "json-ld-1.1"},
+      "input": "toRdf/pr42-in.jsonld",
+      "expect": "toRdf/pr42-out.nq"
     }, {
       "@id": "#trt01",
       "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],

Diff for: tests/toRdf/pr42-in.jsonld

@@ -0,0 +1,23 @@
+{
+  "@context": {
+    "@protected": true,
+    "protected": {
+      "@id": "ex:protected1",
+      "@type": "@id"
+    },
+    "unprotected": {
+      "@id": "ex:unprotected",
+      "@type": "@id",
+      "@container": "@graph",
+      "@context": null
+    }
+  },
+  "@id": "ex:outer",
+  "unprotected": {
+    "@context": {
+      "protected": "ex:protected2"
+    },
+    "@id": "ex:inner",
+    "protected": "p === ex:protected2"
+  }
+}

Diff for: tests/toRdf/pr42-out.nq

@@ -0,0 +1,2 @@
+<ex:outer> <ex:unprotected> _:b0 .
+<ex:inner> <ex:protected2> "p === ex:protected2" _:b0 .