Use tools project for tests

Author: kornilova203

build.sbt

@@ -18,6 +18,7 @@ inThisBuild(
 
 val tests = project
   .in(file("tests"))
+  .dependsOn(tools)
   .aggregate(samples)
   .settings(
     fork in Test := true,

tests/src/test/scala/org/scalanative/bindgen/BindgenSpec.scala

@@ -1,9 +1,8 @@
 package org.scalanative.bindgen
 
-import java.io.{File, PrintWriter}
+import java.io.{File}
 import org.scalatest.FunSpec
 import scala.io.Source
-import scala.sys.process._
 
 class BindgenSpec extends FunSpec {
   describe("Bindgen") {
@@ -19,24 +18,15 @@ class BindgenSpec extends FunSpec {
     }
 
     def bindgen(inputFile: File, name: String, outputFile: File): Unit = {
-      val cmd = Seq(
-        bindgenPath,
-        inputFile.getAbsolutePath,
-        "--name",
-        name,
-        "--link",
-        "bindgentests",
-        "--package",
-        "org.scalanative.bindgen.samples",
-        "--exclude-prefix=__",
-        "--"
-      )
-      val output = Process(cmd).lineStream.mkString("\n")
-
-      new PrintWriter(outputFile) {
-        write(output)
-        close()
-      }
+      Bindgen()
+        .bindgenExecutable(new File(bindgenPath))
+        .header(inputFile)
+        .scalaObjectName(name)
+        .link("bindgentests")
+        .packageName("org.scalanative.bindgen.samples")
+        .excludePrefix("__")
+        .generate()
+        .writeToFile(outputFile)
     }
 
     def contentOf(file: File) =

tools/src/main/scala/org/scalanative/bindgen/Bindgen.scala

@@ -148,12 +148,13 @@ object Bindgen {
       }
 
       if (excludePrefix != null) {
-        cmd :+= excludePrefix
+        cmd ++= Seq("--exclude-prefix", excludePrefix)
       }
 
-      cmd :+= "--"
+      for (arg <- extraArg) cmd ++= Seq("--extra-arg", arg)
+      for (arg <- extraArgBefore) cmd ++= Seq("--extra-arg-before", arg)
 
-      // TODO: extra args
+      cmd :+= "--"
 
       val output = Process(cmd).lineStream.mkString("\n")