chore: update packageurl-go and add encoding tests for #351 (#481)

Signed-off-by: Keith Zantow <kzantow@gmail.com>

syft/pkg/apk_metadata_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/go-test/deep"
+	"github.com/package-url/packageurl-go"
 	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
@@ -21,6 +22,23 @@ func TestApkMetadata_pURL(t *testing.T) {
 			},
 			expected: "pkg:alpine/p@v?arch=a",
 		},
+		// verify #351
+		{
+			metadata: ApkMetadata{
+				Package:      "g++",
+				Version:      "v84",
+				Architecture: "am86",
+			},
+			expected: "pkg:alpine/g++@v84?arch=am86",
+		},
+		{
+			metadata: ApkMetadata{
+				Package:      "g plus plus",
+				Version:      "v84",
+				Architecture: "am86",
+			},
+			expected: "pkg:alpine/g%20plus%20plus@v84?arch=am86",
+		},
 	}
 
 	for _, test := range tests {
@@ -31,6 +49,26 @@ func TestApkMetadata_pURL(t *testing.T) {
 				diffs := dmp.DiffMain(test.expected, actual, true)
 				t.Errorf("diff: %s", dmp.DiffPrettyText(diffs))
 			}
+			// verify packageurl can parse
+			purl, err := packageurl.FromString(actual)
+			if err != nil {
+				t.Errorf("cannot re-parse purl: %s", actual)
+			}
+			if purl.Name != test.metadata.Package {
+				dmp := diffmatchpatch.New()
+				diffs := dmp.DiffMain(test.metadata.Package, purl.Name, true)
+				t.Errorf("invalid purl name: %s", dmp.DiffPrettyText(diffs))
+			}
+			if purl.Version != test.metadata.Version {
+				dmp := diffmatchpatch.New()
+				diffs := dmp.DiffMain(test.metadata.Version, purl.Version, true)
+				t.Errorf("invalid purl version: %s", dmp.DiffPrettyText(diffs))
+			}
+			if purl.Qualifiers.Map()["arch"] != test.metadata.Architecture {
+				dmp := diffmatchpatch.New()
+				diffs := dmp.DiffMain(test.metadata.Architecture, purl.Qualifiers.Map()["arch"], true)
+				t.Errorf("invalid purl architecture: %s", dmp.DiffPrettyText(diffs))
+			}
 		})
 	}
 }