Added rename test cases

Author: daplf

server/src/test/kotlin/org/javacs/kt/LanguageServerTestFixture.kt

@@ -54,6 +54,9 @@ abstract class LanguageServerTestFixture(relativeWorkspaceRoot: String) : Langua
         println("Memory after test: ${total - free} MB used / $total MB total")
     }
 
+    fun renameParams(relativePath: String, line: Int, column: Int, newName: String): RenameParams =
+        textDocumentPosition(relativePath, line, column).run { RenameParams(textDocument, position, newName) }
+
     fun completionParams(relativePath: String, line: Int, column: Int): CompletionParams {
         val file = workspaceRoot.resolve(relativePath)
         val fileId = TextDocumentIdentifier(file.toUri().toString())

server/src/test/kotlin/org/javacs/kt/RenameTest.kt

@@ -0,0 +1,45 @@
+package org.javacs.kt
+
+import org.eclipse.lsp4j.Position
+import org.eclipse.lsp4j.Range
+import org.hamcrest.Matchers.containsString
+import org.hamcrest.Matchers.equalTo
+import org.hamcrest.Matchers.hasItem
+import org.hamcrest.Matchers.hasProperty
+import org.hamcrest.Matchers.hasSize
+import org.junit.Assert.assertThat
+import org.junit.Test
+
+class RenameReferenceTest : SingleFileTestFixture("rename", "SomeClass.kt") {
+
+    @Test
+    fun `rename in the reference`() {
+        val edits = languageServer.textDocumentService.rename(renameParams(file, 4, 26, "NewClassName")).get()!!
+        val changes = edits.documentChanges
+
+        assertThat(changes.size, equalTo(3))
+        assertThat(changes[0].left.textDocument.uri, containsString("SomeOtherClass.kt"))
+
+        assertThat(changes[0].left.edits[0].newText, equalTo("NewClassName"))
+        assertThat(changes[0].left.edits[0].range.start, equalTo(Position(2, 6)))
+        assertThat(changes[0].left.edits[0].range.end, equalTo(Position(2, 20)))
+    }
+}
+
+class RenameDefinitionTest : SingleFileTestFixture("rename", "SomeOtherClass.kt") {
+
+    @Test
+    fun `rename in the definition`() {
+        val edits = languageServer.textDocumentService.rename(renameParams(file, 2, 15, "NewClassName")).get()!!
+        val changes = edits.documentChanges
+
+        println(changes)
+
+        assertThat(changes.size, equalTo(3))
+        assertThat(changes[0].left.textDocument.uri, containsString("SomeOtherClass.kt"))
+
+        assertThat(changes[0].left.edits[0].newText, equalTo("NewClassName"))
+        assertThat(changes[0].left.edits[0].range.start, equalTo(Position(2, 6)))
+        assertThat(changes[0].left.edits[0].range.end, equalTo(Position(2, 20)))
+    }
+}

server/src/test/resources/rename/SomeClass.kt

@@ -0,0 +1,6 @@
+package rename
+
+class SomeClass {
+
+    val something: SomeOtherClass = SomeOtherClass()
+}

server/src/test/resources/rename/SomeOtherClass.kt

@@ -0,0 +1,4 @@
+package rename
+
+class SomeOtherClass {
+}