Add SPARQL evaluation tests for triple terms and reified triples

These tests are derived from the rdf-star SPARQL evaluation tests.
https://github.com/w3c/rdf-star/tree/main/tests/sparql/eval

Closes #140

Author: rubensworks

sparql/sparql12/eval-triple-terms/basic-2.rq

@@ -0,0 +1,5 @@
+PREFIX :       <http://example/>
+
+SELECT * {
+    <<:a :b :c>> ?p ?o
+}

sparql/sparql12/eval-triple-terms/basic-2.srj

@@ -0,0 +1,45 @@
+{
+    "head": {
+        "vars": [
+            "o",
+            "p"
+        ]
+    },
+    "results": {
+        "bindings": [
+            {
+                "o": {
+                    "value": {
+                        "subject": {
+                            "value": "http://example/a",
+                            "type": "uri"
+                        },
+                        "predicate": {
+                            "value": "http://example/b",
+                            "type": "uri"
+                        },
+                        "object": {
+                            "value": "http://example/c",
+                            "type": "uri"
+                        }
+                    },
+                    "type": "triple"
+                },
+                "p": {
+                    "value": "http://www.w3.org/1999/02/22-rdf-syntax-ns#reifies",
+                    "type": "uri"
+                }
+            },
+            {
+                "o": {
+                    "value": "http://example/z",
+                    "type": "uri"
+                },
+                "p": {
+                    "value": "http://example/q",
+                    "type": "uri"
+                }
+            }
+        ]
+    }
+}

sparql/sparql12/eval-triple-terms/basic-3.rq

@@ -0,0 +1,5 @@
+PREFIX :       <http://example/>
+
+SELECT * {
+    <<?s :b :c>> ?p ?o
+}

sparql/sparql12/eval-triple-terms/basic-3.srj

@@ -0,0 +1,54 @@
+{
+    "head": {
+        "vars": [
+            "o",
+            "p",
+            "s"
+        ]
+    },
+    "results": {
+        "bindings": [
+            {
+                "s": {
+                    "value": "http://example/a",
+                    "type": "uri"
+                },
+                "p": {
+                    "value": "http://www.w3.org/1999/02/22-rdf-syntax-ns#reifies",
+                    "type": "uri"
+                },
+                "o": {
+                    "value": {
+                        "subject": {
+                            "value": "http://example/a",
+                            "type": "uri"
+                        },
+                        "predicate": {
+                            "value": "http://example/b",
+                            "type": "uri"
+                        },
+                        "object": {
+                            "value": "http://example/c",
+                            "type": "uri"
+                        }
+                    },
+                    "type": "triple"
+                }
+            },
+            {
+                "s": {
+                    "value": "http://example/a",
+                    "type": "uri"
+                },
+                "p": {
+                    "value": "http://example/q",
+                    "type": "uri"
+                },
+                "o": {
+                    "value": "http://example/z",
+                    "type": "uri"
+                }
+            }
+        ]
+    }
+}

sparql/sparql12/eval-triple-terms/basic-4.rq

@@ -0,0 +1,5 @@
+PREFIX :       <http://example/>
+
+SELECT * {
+    <<:a ?p :c>> ?q :z .
+}

sparql/sparql12/eval-triple-terms/basic-4.srj

@@ -0,0 +1,12 @@
+{ "head": {
+    "vars": [ "p" , "q" ]
+  } ,
+  "results": {
+    "bindings": [
+      { 
+        "p": { "type": "uri" , "value": "http://example/b" } ,
+        "q": { "type": "uri" , "value": "http://example/q" }
+      }
+    ]
+  }
+}

sparql/sparql12/eval-triple-terms/basic-5.rq

@@ -0,0 +1,5 @@
+PREFIX :       <http://example/>
+
+SELECT * {
+    <<:a :b ?o>> ?q :z .
+}

sparql/sparql12/eval-triple-terms/basic-5.srj

@@ -0,0 +1,12 @@
+{ "head": {
+    "vars": [ "o" , "q" ]
+  } ,
+  "results": {
+    "bindings": [
+      { 
+        "o": { "type": "uri" , "value": "http://example/c" } ,
+        "q": { "type": "uri" , "value": "http://example/q" }
+      }
+    ]
+  }
+}

sparql/sparql12/eval-triple-terms/basic-6.rq

@@ -0,0 +1,5 @@
+PREFIX :       <http://example/>
+
+SELECT * {
+    <<?a ?b :nomatch >> ?q :z .
+}

sparql/sparql12/eval-triple-terms/basic-6.srj

@@ -0,0 +1,9 @@
+{ "head": {
+    "vars": [ "a" , "b" , "q" ]
+  } ,
+  "results": {
+    "bindings": [
+      
+    ]
+  }
+}