evaluator: Add a unit test for Evaluator

Signed-off-by: Martin Nonnenmacher <martin.nonnenmacher@here.com>

evaluator/src/test/kotlin/EvaluatorTest.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2017-2018 HERE Europe B.V.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * License-Filename: LICENSE
+ */
+
+package com.here.ort.evaluator
+
+import com.here.ort.model.OrtResult
+import com.here.ort.model.Repository
+import com.here.ort.model.VcsInfo
+import com.here.ort.model.config.RepositoryConfiguration
+
+import io.kotlintest.matchers.haveSize
+import io.kotlintest.should
+import io.kotlintest.shouldBe
+import io.kotlintest.specs.WordSpec
+
+class EvaluatorTest : WordSpec() {
+    init {
+        val ortResult = OrtResult(Repository(VcsInfo.EMPTY, VcsInfo.EMPTY, RepositoryConfiguration()))
+
+        "checkSyntax" should {
+            "succeed if the script can be compiled" {
+                val script = javaClass.getResource("/rules/no_gpl_declared.kts").readText()
+
+                val result = Evaluator().checkSyntax(ortResult, script)
+
+                result shouldBe true
+            }
+
+            "fail if the script can not be compiled" {
+                val result = Evaluator().checkSyntax(ortResult, """
+                    broken script
+                    """.trimIndent())
+
+                result shouldBe false
+            }
+        }
+
+        "evaluate" should {
+            "contain rule errors in the result" {
+                val result = Evaluator().evaluate(ortResult, """
+                    evalErrors += Error(source = "source 1", message = "message 1")
+                    evalErrors += Error(source = "source 2", message = "message 2")
+                    """.trimIndent())
+
+                result.errors should haveSize(2)
+                result.errors[0].let {
+                    it.source shouldBe "source 1"
+                    it.message shouldBe "message 1"
+                }
+                result.errors[1].let {
+                    it.source shouldBe "source 2"
+                    it.message shouldBe "message 2"
+                }
+            }
+        }
+    }
+}