Add e2e test for docker build

Signed-off-by: Daniel Nephin <dnephin@docker.com>

e2e/image/build_test.go

@@ -0,0 +1,83 @@
+package image
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/docker/cli/e2e/internal/fixtures"
+	"github.com/gotestyourself/gotestyourself/fs"
+	"github.com/gotestyourself/gotestyourself/icmd"
+	"github.com/pkg/errors"
+)
+
+func TestBuildFromContextDirectoryWithTag(t *testing.T) {
+	dir := fs.NewDir(t, "test-build-context-dir",
+		fs.WithFile("run", "echo running", fs.WithMode(0755)),
+		fs.WithDir("data", fs.WithFile("one", "1111")),
+		fs.WithFile("Dockerfile", fmt.Sprintf(`
+	FROM	%s
+	COPY	run /usr/bin/run
+	RUN		run
+	COPY	data /data
+		`, fixtures.AlpineImage)))
+	defer dir.Remove()
+
+	result := icmd.RunCmd(
+		icmd.Command("docker", "build", "-t", "myimage", "."),
+		withWorkingDir(dir))
+
+	result.Assert(t, icmd.Expected{Err: icmd.None})
+	assertBuildOutput(t, result.Stdout(), map[int]lineCompare{
+		0:  prefix("Sending build context to Docker daemon"),
+		1:  equals("Step 1/4 : FROM\tregistry:5000/alpine:3.6"),
+		3:  equals("Step 2/4 : COPY\trun /usr/bin/run"),
+		5:  equals("Step 3/4 : RUN\t\trun"),
+		7:  equals("running"),
+		9:  equals("Step 4/4 : COPY\tdata /data"),
+		11: prefix("Removing intermediate container "),
+		12: prefix("Successfully built "),
+		13: equals("Successfully tagged myimage:latest"),
+	})
+}
+
+func withWorkingDir(dir *fs.Dir) func(*icmd.Cmd) {
+	return func(cmd *icmd.Cmd) {
+		cmd.Dir = dir.Path()
+	}
+}
+
+func assertBuildOutput(t *testing.T, actual string, expectedLines map[int]lineCompare) {
+	for i, line := range strings.Split(actual, "\n") {
+		cmp, ok := expectedLines[i]
+		if !ok {
+			continue
+		}
+		if err := cmp(line); err != nil {
+			t.Errorf("line %d: %s", i, err)
+		}
+	}
+	if t.Failed() {
+		t.Log(actual)
+	}
+}
+
+type lineCompare func(string) error
+
+func prefix(expected string) func(string) error {
+	return func(actual string) error {
+		if strings.HasPrefix(actual, expected) {
+			return nil
+		}
+		return errors.Errorf("expected %s to start with %s", actual, expected)
+	}
+}
+
+func equals(expected string) func(string) error {
+	return func(actual string) error {
+		if expected == actual {
+			return nil
+		}
+		return errors.Errorf("got %s, expected %s", actual, expected)
+	}
+}