update tests for the new distro information

Signed-off-by: Alfredo Deza <adeza@anchore.com>

syft/presenter/json/presenter_test.go

@@ -8,6 +8,7 @@ import (
 	"github.com/anchore/go-testutils"
 	"github.com/anchore/stereoscope/pkg/file"
 	"github.com/anchore/stereoscope/pkg/imagetest"
+	"github.com/anchore/syft/syft/distro"
 	"github.com/anchore/syft/syft/pkg"
 	"github.com/anchore/syft/syft/scope"
 	"github.com/sergi/go-diff/diffmatchpatch"
@@ -39,12 +40,12 @@ func TestJsonDirsPresenter(t *testing.T) {
 			{Path: "/some/path/pkg1"},
 		},
 	})
-
+	d := distro.NewUnknownDistro()
 	s, err := scope.NewScopeFromDir("/some/path")
 	if err != nil {
 		t.Fatal(err)
 	}
-	pres := NewPresenter(catalog, s)
+	pres := NewPresenter(catalog, s, d)
 
 	// run presenter
 	err = pres.Present(&buffer)
@@ -100,7 +101,8 @@ func TestJsonImgsPresenter(t *testing.T) {
 	})
 
 	s, err := scope.NewScopeFromImage(img, scope.AllLayersScope)
-	pres := NewPresenter(catalog, s)
+	d := distro.NewUnknownDistro()
+	pres := NewPresenter(catalog, s, d)
 
 	// run presenter
 	err = pres.Present(&buffer)

syft/presenter/json/test-fixtures/snapshot/TestJsonDirsPresenter.golden

@@ -26,5 +26,9 @@
  "source": {
   "type": "directory",
   "target": "/some/path"
+ },
+ "distro": {
+  "name": "",
+  "version": ""
  }
 }

syft/presenter/json/test-fixtures/snapshot/TestJsonImgsPresenter.golden

@@ -35,26 +35,30 @@
    "layers": [
     {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
-     "digest": "sha256:e158b57d6f5a96ef5fd22f2fe76c70b5ba6ff5b2619f9d83125b2aad0492ac7b",
+     "digest": "sha256:78783bfc74fef84f899b4977561ad1172f87753f82cc2157b06bf097e56dfbce",
      "size": 22
     },
     {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
-     "digest": "sha256:da21056e7bf4308ecea0c0836848a7fe92f38fdcf35bc09ee6d98e7ab7beeebf",
+     "digest": "sha256:54ec7f643dafbf9f27032a5e60afe06248c0e99b50aed54bb0fe28ea4825ccaf",
      "size": 16
     },
     {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
-     "digest": "sha256:f0e18aa6032c24659a9c741fc36ca56f589782ea132061ccf6f52b952403da94",
+     "digest": "sha256:ec4775a139c45b1ddf9ea8e1cb43385e92e5c0bf6ec2e3f4192372785b18c106",
      "size": 27
     }
    ],
    "size": 65,
-   "digest": "sha256:2731251dc34951c0e50fcc643b4c5f74922dad1a5d98f302b504cf46cd5d9368",
+   "digest": "sha256:fedd7bcc0b90f071501b662d8e7c9ac7548b88daba6b3deedfdf33f22ed8d95b",
    "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
    "tags": [
     "stereoscope-fixture-image-simple:04e16e44161c8888a1a963720fd0443cbf7eef8101434c431de8725cd98cc9f7"
    ]
   }
+ },
+ "distro": {
+  "name": "",
+  "version": ""
  }
 }