add another test for windows backslashs

src/test/resources/importstest.viper

@@ -0,0 +1,11 @@
+// imports
+import "deps/calendar_header.vpr"
+// sources
+
+// derived
+
+// invariants
+
+
+// interactions
+

src/test/scala/ViperBackendTests.scala

@@ -0,0 +1,14 @@
+package lore
+import munit.FunSuite
+import lore.AST.*
+import lore.backends.ViperBackend
+
+class ViperBackendSuite extends FunSuite:
+  test("Imports"):
+    import java.nio.file.{Path}
+    import java.nio.charset.StandardCharsets
+
+    val compiled = ViperBackend.compileAsSingleFile(List(TViperImport(Path.of("deps/calendar_header.vpr"))))
+    val expectation = String(getClass.getClassLoader.getResourceAsStream("importstest.viper").readAllBytes,  StandardCharsets.UTF_8)
+
+    assertEquals(compiled, expectation)