Refactoring of input validation

Move application file validation to provisionK3s.
Add an ApplicationFileRepository. Also unit tests for the functions.

src/main/kotlin/org/domaindrivenarchitecture/provs/server/application/Application.kt

@@ -37,10 +37,6 @@ fun main(args: Array<String>) {
         println("Config file not found. Please check if path is correct.")
         exitProcess(1)
     }
-    if (!(cmd as K3sCliCommand).isValidApplicationFileName()) {
-        println("Application file not found. Please check if path is correct.")
-        exitProcess(1)
-    }
     if (!cmd.isValidServerType()) {
         throw RuntimeException("Unknown serverType. Currently only k3s is accepted.")
     }

src/main/kotlin/org/domaindrivenarchitecture/provs/server/domain/k3s/ApplicationFileRepository.kt

@@ -1,5 +1,5 @@
 package org.domaindrivenarchitecture.provs.server.domain.k3s
 
 interface ApplicationFileRepository {
-    fun exists(applicationFileName: ApplicationFileName?): Boolean
+    fun exists(applicationFileName: ApplicationFileName?)
 }

src/main/kotlin/org/domaindrivenarchitecture/provs/server/domain/k3s/K3sService.kt

@@ -15,9 +15,8 @@ fun Prov.provisionK3s(cli: K3sCliCommand) = task {
         // full k3s
         val k3sConfig: K3sConfig = getK3sConfig(cli.configFileName)
         val repo: ApplicationFileRepository = DefaultApplicationFileRepository()
-        if(repo.exists(cli.applicationFileName)) {
-            provisionK3sWorker(k3sConfig, grafanaConfigResolved, cli.applicationFileName)
-        }
+        repo.exists(cli.applicationFileName)
+        provisionK3sWorker(k3sConfig, grafanaConfigResolved, cli.applicationFileName)
     }
     else if (cli.reprovision) { // TODO: Add logic that overrides config, when cmd option is set
         deprovisionK3sInfra()

src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/DefaultApplicationFileRepository.kt

@@ -5,11 +5,11 @@ import org.domaindrivenarchitecture.provs.server.domain.k3s.ApplicationFileRepos
 
 class DefaultApplicationFileRepository : ApplicationFileRepository {
 
-    override fun exists(applicationFileName: ApplicationFileName?): Boolean {
-        if (applicationFileName == null) {
-            return true
+    override fun exists(applicationFileName: ApplicationFileName?) {
+        if (applicationFileName != null) {
+            if (!genericFileExistenceCheck(applicationFileName.fullqualified())) {
+                throw RuntimeException("Application file not found. Please check if path is correct.")
+            }
         }
-        return genericFileExistenceCheck(applicationFileName.fileName)
     }
-
 }

src/test/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/DefaultApplicationFileRepositoryKtTest.kt

@@ -0,0 +1,44 @@
+package org.domaindrivenarchitecture.provs.server.infrastructure
+
+import org.domaindrivenarchitecture.provs.server.domain.k3s.ApplicationFileName
+import org.domaindrivenarchitecture.provs.server.domain.k3s.ApplicationFileRepository
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import org.junit.jupiter.api.Assertions.assertEquals
+import java.io.File
+import java.nio.file.Paths
+
+internal class DefaultApplicationFileRepositoryKtTest {
+
+    @Test
+    fun existsThrowsRuntimeException() {
+        //when
+        val invalidFileName: ApplicationFileName = ApplicationFileName("iDontExist")
+        val repo: ApplicationFileRepository = DefaultApplicationFileRepository()
+
+        // then
+        val exception = assertThrows<RuntimeException>(
+            "Should not find the file."
+        ) { repo.exists(invalidFileName) }
+
+        assertEquals(
+            "Application file not found. Please check if path is correct.",
+            exception.message)
+    }
+
+    @Test
+    fun existsPasses() {
+        //when
+        val validFileName = "iExist"
+        File(validFileName).createNewFile()
+
+        val validFile: ApplicationFileName =
+        ApplicationFileName(File(validFileName).absolutePath)
+        val repo: ApplicationFileRepository = DefaultApplicationFileRepository()
+
+        // then
+        repo.exists(validFile)
+
+        File(validFileName).deleteOnExit()
+    }
+}