Rewrite TestBuildCopyAddMultipleFiles to not use fixtures

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>

integration-cli/docker_cli_build_test.go

@@ -304,13 +304,40 @@ RUN [ $(ls -l /exists/exists_file | awk '{print $3":"$4}') = 'dockerio:dockerio'
 }
 
 func TestBuildCopyAddMultipleFiles(t *testing.T) {
-	buildDirectory := filepath.Join(workingDirectory, "build_tests", "TestCopy")
-	if out, _, err := dockerCmdInDir(t, buildDirectory, "build", "-t", "testaddimg", "MultipleFiles"); err != nil {
-		t.Fatalf("build failed to complete: %s, %v", out, err)
-	}
+	name := "testcopymultiplefilestofile"
+	defer deleteImages(name)
+	ctx, err := fakeContext(`FROM busybox
+RUN echo 'dockerio:x:1001:1001::/bin:/bin/false' >> /etc/passwd
+RUN echo 'dockerio:x:1001:' >> /etc/group
+RUN mkdir /exists
+RUN touch /exists/exists_file
+RUN chown -R dockerio.dockerio /exists
+COPY test_file1 test_file2 /exists/
+ADD test_file3 test_file4 https://docker.com/robots.txt /exists/
+RUN [ $(ls -l / | grep exists | awk '{print $3":"$4}') = 'dockerio:dockerio' ]
+RUN [ $(ls -l /exists/test_file1 | awk '{print $3":"$4}') = 'root:root' ]
+RUN [ $(ls -l /exists/test_file2 | awk '{print $3":"$4}') = 'root:root' ]
 
-	deleteImages("testaddimg")
+RUN [ $(ls -l /exists/test_file3 | awk '{print $3":"$4}') = 'root:root' ]
+RUN [ $(ls -l /exists/test_file4 | awk '{print $3":"$4}') = 'root:root' ]
+RUN [ $(ls -l /exists/robots.txt | awk '{print $3":"$4}') = 'root:root' ]
 
+RUN [ $(ls -l /exists/exists_file | awk '{print $3":"$4}') = 'dockerio:dockerio' ]
+`,
+		map[string]string{
+			"test_file1": "test1",
+			"test_file2": "test2",
+			"test_file3": "test3",
+			"test_file4": "test4",
+		})
+	defer ctx.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := buildImageFromContext(name, ctx, true); err != nil {
+		t.Fatal(err)
+	}
 	logDone("build - mulitple file copy/add tests")
 }