test: add integration corner cases for Alpine

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

test/integration/corner_cases_test.go

@@ -0,0 +1,43 @@
+package integration
+
+import (
+	"fmt"
+	"testing"
+
+	v1 "github.com/anchore/grype-db/pkg/db/v1"
+	"github.com/anchore/grype/grype"
+	"github.com/anchore/grype/grype/vulnerability"
+	"github.com/anchore/syft/syft/scope"
+)
+
+func TestApkNoVersion(t *testing.T) {
+	store := mockStore{
+		backend: map[string]map[string][]v1.Vulnerability{
+			"nvd": {
+				"libvncserver": []v1.Vulnerability{
+					{
+						ID:                "CVE-2010-5304",
+						VersionConstraint: "< 0.9.9",
+						VersionFormat:     "unknown",
+					},
+				},
+			},
+		},
+	}
+
+	results, _, _, err := grype.FindVulnerabilities(
+		vulnerability.NewProviderFromStore(&store),
+		"dir://test-fixtures/corner-cases/apk",
+		scope.AllLayersScope,
+	)
+	if err != nil {
+		t.Fatalf("failed to find vulnerabilities: %+v", err)
+	}
+
+	for result := range results.Enumerate() {
+		fmt.Printf("%v\n", result)
+	}
+	if len(results.Enumerate()) != 1 {
+		t.Errorf("vulnerability count does not match '%d' != '%d'", len(results.Enumerate()), 1)
+	}
+}

test/integration/test-fixtures/corner-cases/apk/vnc/etc/os-release

@@ -0,0 +1,6 @@
+NAME="Alpine Linux"
+ID=alpine
+VERSION_ID=3.12.0
+PRETTY_NAME="Alpine Linux v3.12"
+HOME_URL="https://alpinelinux.org/"
+BUG_REPORT_URL="https://bugs.alpinelinux.org/"