Add test for @context redefinition.

Author: davidlehn

tests/expand-manifest.jsonld

@@ -1819,6 +1819,13 @@
       "purpose": "The value of @type in an expanded term definition object MUST be a string or null.",
       "input": "expand/er55-in.jsonld",
       "expectErrorCode": "invalid type mapping"
+    }, {
+      "@id": "#ter56",
+      "@type": [ "jld:NegativeEvaluationTest", "jld:ExpandTest" ],
+      "name": "Invalid redefinition of @context keyword.",
+      "purpose": "Verifies that an exception is raise when attempting to redefine @context.",
+      "input": "expand/er56-in.jsonld",
+      "expectErrorCode": "keyword redefinition"
     }, {
       "@id": "#tes01",
       "@type": ["jld:NegativeEvaluationTest", "jld:ExpandTest"],

tests/expand/er56-in.jsonld

@@ -0,0 +1,10 @@
+{
+  "@context": {
+    "@context": {
+      "p": "ex:p"
+    }
+  },
+  "@id": "ex:1",
+  "p": "value"
+}
+

tests/toRdf-manifest.jsonld

@@ -2244,6 +2244,13 @@
      "purpose": "The value of @type in an expanded term definition object MUST be a string or null.",
      "input": "toRdf/er55-in.jsonld",
      "expectErrorCode": "invalid type mapping"
+    }, {
+      "@id": "#ter56",
+      "@type": [ "jld:NegativeEvaluationTest", "jld:ToRDFTest" ],
+      "name": "Invalid redefinition of @context keyword.",
+      "purpose": "Verifies that an exception is raise when attempting to redefine @context.",
+      "input": "expand/er56-in.jsonld",
+      "expectErrorCode": "keyword redefinition"
     }, {
       "@id": "#tin01",
       "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],

tests/toRdf/er56-in.jsonld

@@ -0,0 +1,10 @@
+{
+  "@context": {
+    "@context": {
+      "p": "ex:p"
+    }
+  },
+  "@id": "ex:1",
+  "p": "value"
+}
+