add regression test to cover issue #212

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

Makefile

@@ -130,7 +130,7 @@ unit: fixtures ## Run unit tests (with coverage)
 .PHONY: integration
 integration: ## Run integration tests
 	$(call title,Running integration tests)
-	go test -tags=integration ./test/integration
+	go test -tags=integration -v ./test/integration
 
 # note: this is used by CI to determine if the integration test fixture cache (docker image tars) should be busted
 integration-fingerprint:

test/integration/regression_test.go

@@ -0,0 +1,38 @@
+// +build integration
+
+package integration
+
+import (
+	"testing"
+
+	"github.com/anchore/syft/syft/pkg"
+
+	"github.com/anchore/stereoscope/pkg/imagetest"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/scope"
+)
+
+func TestRegression212ApkBufferSize(t *testing.T) {
+	// This is a regression test for issue #212 (https://github.com/anchore/syft/issues/212) in which the apk db could
+	// not be processed due to a scanner buffer that was too small
+
+	fixtureImageName := "image-large-apk-data"
+	_, cleanup := imagetest.GetFixtureImage(t, "docker-archive", fixtureImageName)
+	tarPath := imagetest.GetFixtureImageTarPath(t, fixtureImageName)
+	defer cleanup()
+
+	catalog, _, _, err := syft.Catalog("docker-archive:"+tarPath, scope.SquashedScope)
+	if err != nil {
+		t.Fatalf("failed to catalog image: %+v", err)
+	}
+
+	expectedPkgs := 57
+	actualPkgs := 0
+	for range catalog.Enumerate(pkg.ApkPkg) {
+		actualPkgs += 1
+	}
+
+	if actualPkgs != expectedPkgs {
+		t.Errorf("unexpected number of APK packages: %d != %d", expectedPkgs, actualPkgs)
+	}
+}

test/integration/test-fixtures/image-large-apk-data/Dockerfile

@@ -0,0 +1,2 @@
+FROM alpine:latest
+RUN apk add tzdata vim alpine-sdk