Check for nulls.

metaindu · Nov 12, 2021 · cc56d6b · cc56d6b
1 parent e0b1357
commit cc56d6b
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Showing 3 changed files with 26 additions and 2 deletions.
diff --git a/MetaphysicsIndustries.Solus.Test/ExpressionsT/RandomExpressionT/ResultTest.cs b/MetaphysicsIndustries.Solus.Test/ExpressionsT/RandomExpressionT/ResultTest.cs
@@ -42,6 +42,9 @@ public void ResultIsScalar()
             Assert.IsFalse(result.IsMatrix(env));
             Assert.AreEqual(0, result.GetTensorRank(env));
             Assert.IsFalse(result.IsString(env));
+            Assert.IsNull(result.GetDimension(env, 0));
+            Assert.IsNull(result.GetDimensions(env));
+            Assert.IsNull(result.GetVectorLength(env));
         }
     }
-}
+}
diff --git a/MetaphysicsIndustries.Solus.Test/ExpressionsT/VariableAccessT/ResultTest.cs b/MetaphysicsIndustries.Solus.Test/ExpressionsT/VariableAccessT/ResultTest.cs
@@ -108,5 +108,24 @@ public void ResultMatchesExpr3()
             Assert.AreEqual(0, result.GetTensorRank(env));
             Assert.IsTrue(result.IsString(env));
         }
+
+        [Test]
+        public void MissingVariableYieldsNull()
+        {
+            // given
+            var expr = new VariableAccess("a");
+            var env = new SolusEnvironment();  // no "a"
+            // when
+            var result = expr.Result;
+            // then
+            Assert.IsNull(result.IsScalar(env));
+            Assert.IsNull(result.IsVector(env));
+            Assert.IsNull(result.IsMatrix(env));
+            Assert.IsNull(result.GetTensorRank(env));
+            Assert.IsNull(result.IsString(env));
+            Assert.IsNull(result.GetDimension(env, 0));
+            Assert.IsNull(result.GetDimensions(env));
+            Assert.IsNull(result.GetVectorLength(env));
+        }
     }
-}
+}
diff --git a/MetaphysicsIndustries.Solus.Test/ExpressionsT/VectorExpressionT/ResultTest.cs b/MetaphysicsIndustries.Solus.Test/ExpressionsT/VectorExpressionT/ResultTest.cs
@@ -46,7 +46,9 @@ public void ResultIsVector()
             Assert.IsFalse(result.IsMatrix(env));
             Assert.AreEqual(1, result.GetTensorRank(env));
             Assert.IsFalse(result.IsString(env));
+            Assert.IsNull(result.GetDimension(env, -1));
             Assert.AreEqual(4, result.GetDimension(env, 0));
+            Assert.IsNull(result.GetDimension(env, 1));
             Assert.AreEqual(new int[] { 4 },
                 result.GetDimensions(env));
             Assert.AreEqual(4, result.GetVectorLength(env));