port dotnet cataloger to new generic cataloger pattern (#1286)

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

syft/pkg/cataloger/internal/pkgtest/assert_packages_equal.go

@@ -0,0 +1,37 @@
+package pkgtest
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/source"
+)
+
+func AssertPackagesEqual(t testing.TB, expected, actual []pkg.Package) {
+	if diff := cmp.Diff(expected, actual,
+		cmpopts.IgnoreFields(pkg.Package{}, "id"), // note: ID is not deterministic for test purposes
+		cmp.Comparer(
+			func(x, y source.LocationSet) bool {
+				xs := x.ToSlice()
+				ys := y.ToSlice()
+
+				if len(xs) != len(ys) {
+					return false
+				}
+				for i, xe := range xs {
+					ye := ys[i]
+					if !(cmp.Equal(xe.Coordinates, ye.Coordinates) && cmp.Equal(xe.VirtualPath, ye.VirtualPath)) {
+						return false
+					}
+				}
+
+				return true
+			},
+		),
+	); diff != "" {
+		t.Errorf("unexpected packages from parsing (-expected +actual)\n%s", diff)
+	}
+}

syft/pkg/cataloger/internal/pkgtest/test_generic_parser.go

@@ -0,0 +1,35 @@
+package pkgtest
+
+import (
+	"os"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/stretchr/testify/require"
+
+	"github.com/anchore/syft/syft/artifact"
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/pkg/cataloger/generic"
+	"github.com/anchore/syft/syft/source"
+)
+
+func TestGenericParser(t *testing.T, fixturePath string, parser generic.Parser, expectedPkgs []pkg.Package, expectedRelationships []artifact.Relationship) {
+	TestGenericParserWithEnv(t, fixturePath, parser, nil, expectedPkgs, expectedRelationships)
+}
+
+func TestGenericParserWithEnv(t *testing.T, fixturePath string, parser generic.Parser, env *generic.Environment, expectedPkgs []pkg.Package, expectedRelationships []artifact.Relationship) {
+	fixture, err := os.Open(fixturePath)
+	require.NoError(t, err)
+
+	actualPkgs, actualRelationships, err := parser(nil, env, source.LocationReadCloser{
+		Location:   source.NewLocation(fixture.Name()),
+		ReadCloser: fixture,
+	})
+	require.NoError(t, err)
+
+	AssertPackagesEqual(t, expectedPkgs, actualPkgs)
+
+	if diff := cmp.Diff(expectedRelationships, actualRelationships); diff != "" {
+		t.Errorf("unexpected relationships from parsing (-expected +actual)\n%s", diff)
+	}
+}