Add test for highlighting escape sequences in character literals

idea/tests/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingLexerTest.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+package org.jetbrains.kotlin.idea.highlighter
+
+import com.intellij.testFramework.LexerTestCase
+
+class KotlinHighlightingLexerTest : LexerTestCase() {
+    override fun createLexer() = KotlinHighlightingLexer()
+
+    fun testCharLiteralValidEscape() {
+        doTest("'\\n'",  """CHARACTER_LITERAL (''')
+                           |VALID_STRING_ESCAPE_TOKEN ('\n')
+                           |CHARACTER_LITERAL (''')""".trimMargin())
+    }
+
+    fun testCharLiteralInvalidEscape() {
+        doTest("'\\q'",  """CHARACTER_LITERAL (''')
+                           |INVALID_CHARACTER_ESCAPE_TOKEN ('\q')
+                           |CHARACTER_LITERAL (''')""".trimMargin())
+    }
+
+    override fun getDirPath() = throw UnsupportedOperationException()
+}