--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/service/mqtt_to_rdf/inference_test.py	Sun Aug 29 23:59:09 2021 -0700
@@ -0,0 +1,92 @@
+import unittest
+
+from rdflib import ConjunctiveGraph, Namespace, Graph
+from rdflib.parser import StringInputSource
+
+from inference import Inference
+
+ROOM = Namespace('http://projects.bigasterisk.com/room/')
+
+
+def N3(txt: str):
+    g = ConjunctiveGraph()
+    prefix = "@prefix : <http://example.com/> .\n"
+    g.parse(StringInputSource((prefix + txt).encode('utf8')), format='n3')
+    return g
+
+
+def makeInferenceWithRules(n3):
+    inf = Inference()
+    inf.setRules(N3(n3))
+    return inf
+
+
+class WithGraphEqual(unittest.TestCase):
+
+    def assertGraphEqual(self, g: Graph, expected: Graph):
+        stmts1 = list(g.triples((None, None, None)))
+        stmts2 = list(expected.triples((None, None, None)))
+        self.assertCountEqual(stmts1, stmts2)
+
+
+class TestInferenceWithoutVars(WithGraphEqual):
+
+    def testEmitNothing(self):
+        inf = makeInferenceWithRules("")
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertEqual(len(implied), 0)
+
+    def testSimple(self):
+        inf = makeInferenceWithRules("{ :a :b :c . } => { :a :b :new . } .")
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertGraphEqual(implied, N3(":a :b :new ."))
+
+    def testTwoRounds(self):
+        inf = makeInferenceWithRules("""
+        { :a :b :c . } => { :a :b :new1 . } .
+        { :a :b :new1 . } => { :a :b :new2 . } .
+        """)
+
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertGraphEqual(implied, N3(":a :b :new1, :new2 ."))
+
+
+class TestInferenceWithVars(WithGraphEqual):
+
+    def testVarInSubject(self):
+        inf = makeInferenceWithRules("{ ?x :b :c . } => { :new :stmt ?x } .")
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertGraphEqual(implied, N3(":new :stmt :a ."))
+
+    def testVarInObject(self):
+        inf = makeInferenceWithRules("{ :a :b ?x . } => { :new :stmt ?x } .")
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertGraphEqual(implied, N3(":new :stmt :c ."))
+
+    def testVarMatchesTwice(self):
+        inf = makeInferenceWithRules("{ :a :b ?x . } => { :new :stmt ?x } .")
+        implied = inf.infer(N3(":a :b :c, :d ."))
+        self.assertGraphEqual(implied, N3(":new :stmt :c, :d ."))
+
+    def testTwoRulesWithVars(self):
+        inf = makeInferenceWithRules("""
+        { :a :b ?x . } => { :new :stmt ?x } .
+        { ?y :stmt ?z . } => { :new :stmt2 ?z }
+        """)
+        implied = inf.infer(N3(":a :b :c ."))
+        self.assertGraphEqual(implied, N3(":new :stmt :c; :stmt2 :new ."))
+
+
+class TestInferenceWithMathFunctions(WithGraphEqual):
+
+    def test1(self):
+        inf = makeInferenceWithRules("{ :a :b ?x . ?x math:greaterThan 5 } => { :new :stmt ?x } .")
+        self.assertGraphEqual(inf.infer(N3(":a :b 3 .")), N3(""))
+        self.assertGraphEqual(inf.infer(N3(":a :b 5 .")), N3(""))
+        self.assertGraphEqual(inf.infer(N3(":a :b 6 .")), N3(":new :stmt :a ."))
+
+class TestInferenceWithCustomFunctions(WithGraphEqual):
+
+    def testAsFarenheit(self):
+        inf = makeInferenceWithRules("{ :a :b ?x . ?x :asFarenheit ?f } => { :new :stmt ?f } .")
+        self.assertGraphEqual(inf.infer(N3(":a :b 0 .")), N3(":new :stmt -32 ."))