Merge pull request #143 from SpineEventEngine/tests-to-kotlin

Migrate tests to Kotlin, reorganise `java-tests`

Author: alexander-yevsyukov

buildSrc/src/main/kotlin/io/spine/dependency/local/ProtoData.kt

@@ -73,7 +73,7 @@ object ProtoData {
      * The version of ProtoData dependencies.
      */
     val version: String
-    private const val fallbackVersion = "0.65.1"
+    private const val fallbackVersion = "0.66.0"
 
     /**
      * The distinct version of ProtoData used by other build tools.

buildSrc/src/main/kotlin/module.gradle.kts

@@ -26,15 +26,16 @@
 
 import io.spine.dependency.build.Dokka
 import io.spine.dependency.build.ErrorProne
-import io.spine.dependency.test.JUnit
 import io.spine.dependency.lib.Jackson
 import io.spine.dependency.lib.Protobuf
-import io.spine.dependency.test.Truth
 import io.spine.dependency.local.CoreJava
 import io.spine.dependency.local.Logging
 import io.spine.dependency.local.Spine
 import io.spine.dependency.local.ToolBase
 import io.spine.dependency.local.Validation
+import io.spine.dependency.test.JUnit
+import io.spine.dependency.test.Kotest
+import io.spine.dependency.test.Truth
 import io.spine.gradle.javac.configureErrorProne
 import io.spine.gradle.javac.configureJavac
 import io.spine.gradle.javadoc.JavadocConfig
@@ -99,6 +100,7 @@ fun Module.addDependencies() {
         }
         JUnit.api.forEach { testImplementation(it) }
         Truth.libs.forEach { testImplementation(it) }
+        testImplementation(Kotest.assertions)
         testRuntimeOnly(JUnit.runner)
     }
 }

dependencies.md

@@ -34,8 +34,8 @@
 /**
  * A number that can be compared to another number.
  *
- * <p>Note that for values that are outside {@code Long} range, or when a
- * precision beyond that of {@code Double} is required, instances of this class
+ * <p>Note that for values that are outside {@code Long} range, or when
+ * the precision beyond that of {@code Double} is required, instances of this class
  * yield incorrect comparison results.
  */
 @Immutable

java-runtime/src/main/java/io/spine/validate/ComparableNumber.java

@@ -43,7 +43,8 @@
  * their values with no reflection {@linkplain Message#getField(Descriptors.FieldDescriptor)
  * used by Protobuf}.
  *
- * <p>This mixin is an experimental part of the framework and may be changed or removed in future.
+ * <p>This mixin is an experimental part of the framework and may be changed or
+ * removed in the future.
  */
 @GeneratedMixin
 @Experimental

java-runtime/src/main/java/io/spine/validate/FieldAwareMessage.java

@@ -113,8 +113,8 @@ private static void appendPrefix(StringBuilder target, String prefix) {
     /**
      * Returns a validation error message which may have formatting placeholders.
      *
-     * <p>A custom message is returned if it is present in the option. Otherwise,
-     * default message is returned.
+     * <p>A custom message is returned if it is present in the option.
+     * Otherwise, a default message associated with the option is returned.
      *
      * @param option
      *         a validation option used to get the default message