docker_test: Add a sample testdir.tar.gz

Signed-off-by: Simarpreet Singh <simar@linux.com>

extractor/docker/docker_test.go

@@ -227,8 +227,9 @@ func TestDockerExtractor_Extract(t *testing.T) {
 		name            string
 		imageName       string
 		manifestResp    string
-		layerData       []byte
+		fileName        string
 		blobData        string
+		fileToExtract   []string
 		expectedFileMap extractor.FileMap
 		expectedError   string
 	}{
@@ -245,24 +246,12 @@ func TestDockerExtractor_Extract(t *testing.T) {
 		     }
 		  ]
 		}`,
-			layerData: []byte{ // this is hello.txt containing "hello world\n" POSIX tar'd and then gzipped
+			fileName:      "testdata/testdir.tar.gz", // includes helloworld.txt and badworld.txt
-				0x1f, 0x8b, 0x8, 0x8, 0xfa, 0x33, 0xd4, 0x5d, 0x0, 0x3, 0x68, 0x65,
-				0x6c, 0x6c, 0x6f, 0x0, 0xd3, 0xd3, 0xcf, 0x48, 0xcd, 0xc9, 0xc9, 0xd7,
-				0x2b, 0xa9, 0x28, 0x61, 0xa0, 0x15, 0x30, 0x30, 0x30, 0x30, 0x33, 0x31,
-				0x51, 0x0, 0xd1, 0xe6, 0x66, 0xa6, 0x60, 0xda, 0xc0, 0x8, 0xc2, 0x87, 0x0,
-				0x53, 0x53, 0x5, 0x43, 0x63, 0x53, 0x33, 0x53, 0x3, 0x63, 0x43, 0x33, 0x23,
-				0x23, 0x5, 0x3, 0x43, 0x63, 0x63, 0x13, 0x3, 0x6, 0x5, 0x3, 0x9a, 0xb9, 0x8,
-				0x9, 0x94, 0x16, 0x97, 0x24, 0x16, 0x1, 0x9d, 0x52, 0x9c, 0x99, 0xb, 0xa4,
-				0x71, 0x3, 0xa0, 0xb2, 0xb4, 0x34, 0x3c, 0xf2, 0x10, 0x9f, 0x28, 0xc0, 0xe9,
-				0x21, 0x2, 0xe4, 0xbb, 0x39, 0x18, 0x26, 0x19, 0x5f, 0x89, 0x65, 0x60, 0x7e,
-				0x7b, 0x90, 0x91, 0x17, 0x28, 0x70, 0x68, 0xc1, 0x77, 0xff, 0x5c, 0x3e, 0xf3,
-				0x5, 0x70, 0x15, 0xd, 0xe6, 0xcc, 0xb3, 0xee, 0xc9, 0xaa, 0x33, 0x68, 0xc, 0x98,
-				0x1b, 0x47, 0xc1, 0x28, 0x18, 0x5, 0xa3, 0x60, 0x14, 0x50, 0x1f, 0x0, 0x0,
-				0x7b, 0x78, 0xf9, 0x4b, 0x0, 0x8, 0x0, 0x0,
-			},
 			blobData:      "foo",
+			fileToExtract: []string{"testdir/helloworld.txt"},
 			expectedFileMap: extractor.FileMap{
 				"/config":                []uint8{0x66, 0x6f, 0x6f},
+				"testdir/helloworld.txt": []uint8{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0xa},
 			},
 		},
 		{
@@ -288,10 +277,10 @@ func TestDockerExtractor_Extract(t *testing.T) {
 		    }
 		 ]
 		}`,
-			layerData:       []byte{0xde, 0xad, 0xbe, 0xef},
+			fileName:        "testdata/opq.tar",
 			blobData:        "foo",
 			expectedFileMap: extractor.FileMap(nil),
-			expectedError:   "invalid gzip: unexpected EOF",
+			expectedError:   "invalid gzip: gzip: invalid header",
 		},
 	}
 
@@ -303,7 +292,8 @@ func TestDockerExtractor_Extract(t *testing.T) {
 				w.Header().Set("Content-Type", "application/vnd.docker.distribution.manifest.v2+json")
 				_, _ = fmt.Fprint(w, tc.manifestResp)
 			case strings.Contains(httpPath, "/v2/library/fooimage/blobs/sha256:62d8908bee94c202b2d35224a221aaa2058318bfa9879fa541efaecba272331b"):
-				_, _ = w.Write(tc.layerData)
+				b, _ := ioutil.ReadFile(tc.fileName)
+				_, _ = w.Write(b)
 			case strings.Contains(httpPath, "/v2/library/fooimage/blobs/"):
 				_, _ = w.Write([]byte(tc.blobData))
 			default:
@@ -332,7 +322,6 @@ func TestDockerExtractor_Extract(t *testing.T) {
 			Cache:  cache.Initialize(tempCacheDir),
 		}
 
-		filesToExtract := []string{"file1", "file2", "file3"}
 		tsURL := strings.TrimPrefix(ts.URL, "http://")
 
 		var imageName string
@@ -342,7 +331,7 @@ func TestDockerExtractor_Extract(t *testing.T) {
 		default:
 			imageName = tsURL + "/library/fooimage"
 		}
-		fm, err := de.Extract(context.TODO(), imageName, filesToExtract)
+		fm, err := de.Extract(context.TODO(), imageName, tc.fileToExtract)
 
 		switch {
 		case tc.expectedError != "":