add tests

Author: nbransby

build.gradle.kts

@@ -50,6 +50,12 @@ kotlin {
                 implementation(kotlin("stdlib-jdk8"))
             }
         }
+        val jvmTest by getting {
+            dependencies {
+                implementation("junit:junit:4.12")
+                implementation("org.assertj:assertj-core:3.11.1")
+            }
+        }
     }
 }
 

src/test/java/com/github/difflib/DiffUtilsTest.kt src/jvmTest/kotlin/com/github/difflib/DiffUtilsTest.kt

@@ -108,7 +108,7 @@ class GenerateUnifiedDiffTest {
         val unifiedDiff = UnifiedDiffUtils.generateUnifiedDiff(originalFile, revisedFile,
                 origLines, patch, 10)
 
-        println(unifiedDiff.stream().collect<String, *>(joining("\n")))
+        println(unifiedDiff.stream().collect(joining("\n")))
 
         val fromUnifiedPatch = UnifiedDiffUtils.parseUnifiedDiff(unifiedDiff)
         val patchedLines: List<String>
@@ -135,7 +135,7 @@ class GenerateUnifiedDiffTest {
             val lines = ArrayList<String>()
             var line = ""
             BufferedReader(FileReader(filename)).use { `in` ->
-                while ((line = `in`.readLine()) != null) {
+                while (`in`.readLine().also { line = it } != null) {
                     lines.add(line)
                 }
             }

src/test/java/com/github/difflib/GenerateUnifiedDiffTest.kt src/jvmTest/kotlin/com/github/difflib/GenerateUnifiedDiffTest.kt

@@ -297,7 +297,7 @@ class DiffRowGeneratorTest {
         val generator = DiffRowGenerator.create()
                 .showInlineDiffs(true)
                 .mergeOriginalRevised(true)
-                .inlineDiffBySplitter { line -> DiffRowGenerator.splitStringPreserveDelimiter(line, Pattern.compile(",")) }
+                .inlineDiffBySplitter { line -> DiffRowGenerator.splitStringPreserveDelimiter(line, Regex(",")) }
                 .oldTag { f -> "~" }
                 .newTag { f -> "**" }
                 .build()
@@ -323,10 +323,10 @@ class DiffRowGeneratorTest {
                 .build()
 
         val listOne = Files.lines(File("target/test-classes/mocks/issue15_1.txt").toPath())
-                .collect<List<String>, Any>(toList())
+                .collect(toList())
 
         val listTwo = Files.lines(File("target/test-classes/mocks/issue15_2.txt").toPath())
-                .collect<List<String>, Any>(toList())
+                .collect(toList())
 
         val rows = generator.generateDiffRows(listOne, listTwo)