Remove slf4j dependency (#318)

build.sbt

@@ -32,9 +32,10 @@ scriptedLaunchOpts ++= {
     Seq("-Dplugin.version=" + version.value)
 }
 
+testFrameworks += new TestFramework("wvlet.airspec.Framework")
+
 libraryDependencies ++= Seq(
-  "org.slf4j"          % "slf4j-api"        % "2.0.3",
-  "org.apache.commons" % "commons-compress" % "1.22",
-  "org.tukaani"        % "xz"               % "1.9",
-  "org.specs2"        %% "specs2-core"      % "4.18.0" % "test"
+  "org.wvlet.airframe" %% "airspec"          % "22.11.0" % Test,
+  "org.apache.commons"  % "commons-compress" % "1.22",
+  "org.tukaani"         % "xz"               % "1.9"
 )

src/test/scala/xerial/sbt/VersionStringSpec.scala

@@ -1,54 +1,57 @@
 package xerial.sbt
 
-import org.specs2.mutable.Specification
+import wvlet.airspec.AirSpec
 import xerial.sbt.pack.{DefaultVersionStringOrdering, VersionString}
 
-class VersionStringSpec extends Specification {
+import scala.math.Ordered.orderingToOrdered
+
+class VersionStringSpec extends AirSpec {
   implicit val versionStringOrdering = DefaultVersionStringOrdering
 
-  "VersionString" should {
-    "accept any string" in {
+  test("VersionString") {
+    test("accept any string") {
       VersionString("1.0")
       VersionString("1.0-alpha")
       VersionString("1")
       VersionString("-alpha")
       VersionString("1231892")
       VersionString("asd;.a2,.-")
-
-      ok
     }
 
-    "properly deconstruct arbitrary string" in {
-      VersionString("1") === VersionString.fromNumbers(1 :: Nil, None)
-      VersionString("1.2") === VersionString.fromNumbers(1 :: 2 :: Nil, None)
-      VersionString("1.2.3") === VersionString.fromNumbers(1 :: 2 :: 3 :: Nil, None)
-      VersionString("1.2.3.4") === VersionString.fromNumbers(1 :: 2 :: 3 :: 4 :: Nil, None)
-      VersionString("1.2.3.4-alpha") === VersionString.fromNumbers(1 :: 2 :: 3 :: 4 :: Nil, Some("alpha"))
-      VersionString("1.2.3.4-alpha-beta") === VersionString.fromNumbers(1 :: 2 :: 3 :: 4 :: Nil, Some("alpha-beta"))
-      VersionString("foo") === VersionString(List.empty[String], Some("foo"))
-      VersionString("foo.bar") === VersionString(List.empty[String], Some("foo.bar"))
-      VersionString("foo.bar-alpha") === VersionString(List.empty[String], Some("foo.bar-alpha"))
+    test("properly deconstruct arbitrary string") {
+      VersionString("1") shouldBe VersionString.fromNumbers(1 :: Nil, None)
+      VersionString("1.2") shouldBe VersionString.fromNumbers(1 :: 2 :: Nil, None)
+      VersionString("1.2.3") shouldBe VersionString.fromNumbers(1 :: 2 :: 3 :: Nil, None)
+      VersionString("1.2.3.4") shouldBe VersionString.fromNumbers(1 :: 2 :: 3 :: 4 :: Nil, None)
+      VersionString("1.2.3.4-alpha") shouldBe VersionString.fromNumbers(1 :: 2 :: 3 :: 4 :: Nil, Some("alpha"))
+      VersionString("1.2.3.4-alpha-beta") shouldBe VersionString.fromNumbers(
+        1 :: 2 :: 3 :: 4 :: Nil,
+        Some("alpha-beta")
+      )
+      VersionString("foo") shouldBe VersionString(List.empty[String], Some("foo"))
+      VersionString("foo.bar") shouldBe VersionString(List.empty[String], Some("foo.bar"))
+      VersionString("foo.bar-alpha") shouldBe VersionString(List.empty[String], Some("foo.bar-alpha"))
     }
 
-    "properly sort" in {
-      VersionString("1") must be_<(VersionString("1.2.3.4"))
-      VersionString("2") must be_>(VersionString("1.2.3.4"))
-      VersionString("1.2.2") must be_<(VersionString("1.2.3.4"))
-      VersionString("1.2.4") must be_>(VersionString("1.2.3.4"))
-      VersionString("1.2.3.4.5") must be_>(VersionString("1.2.3.4"))
+    test("properly sort") {
+      VersionString("1") < VersionString("1.2.3.4") shouldBe true
+      VersionString("2") > VersionString("1.2.3.4") shouldBe true
+      VersionString("1.2.2") < VersionString("1.2.3.4") shouldBe true
+      VersionString("1.2.4") > VersionString("1.2.3.4") shouldBe true
+      VersionString("1.2.3.4.5") > VersionString("1.2.3.4") shouldBe true
 
-      VersionString("2.9.2") must be_<(VersionString("2.10.4"))
+      VersionString("2.9.2") < VersionString("2.10.4") shouldBe true
 
-      VersionString("1.2") must be_>(VersionString("1.2-alpha"))
-      VersionString("1.2-beta") must be_>(VersionString("1.2-alpha"))
+      VersionString("1.2") > VersionString("1.2-alpha") shouldBe true
+      VersionString("1.2-beta") > VersionString("1.2-alpha") shouldBe true
 
-      VersionString("apple") must be_<(VersionString("pie"))
+      VersionString("apple") < VersionString("pie") shouldBe true
     }
 
-    "preserve 0-padding in version strings" in {
+    test("preserve 0-padding in version strings") {
       val v = VersionString("1.09")
-      v.major mustEqual "1"
-      v.minor mustEqual Some("09")
+      v.major shouldBe "1"
+      v.minor shouldBe Some("09")
     }
   }
 }