Renamed *.jet to *.kt in test data of JetPsiCheckerTest.

idea/testData/checker/StringTemplates.kt

@@ -0,0 +1,23 @@
+fun demo() {
+  val abc = 1
+  val a = ""
+  val asd = 1
+  val bar = 5
+  fun map(<warning>f</warning> : () -> Any?) : Int  = 1
+  fun buzz(<warning>f</warning> : () -> Any?) : Int  = 1
+  val sdf = 1
+  val foo = 3;
+    use("$abc")
+    use("$")
+    use("$.$.asdf$\t")
+    use("asd\$")
+    use("asd$a<error>\x</error>")
+    use("asd$a$asd$ $<error>xxx</error>")
+    use("fosdfasdo${1 + bar + 100}}sdsdfgdsfsdf")
+    use("foo${bar + map {foo}}sdfsdf")
+    use("foo${bar + map { "foo" }}sdfsdf")
+    use("foo${bar + map {
+      "foo$sdf${ buzz{}}" }}sdfsdf")
+}
+
+fun use(<warning>s</warning>: String) {}