DockerCLI/cli/command/image/save_test.go

116 lines
3.2 KiB
Go
Raw Normal View History

package image
import (
"io"
"os"
"strings"
"testing"
"github.com/docker/cli/internal/test"
"github.com/pkg/errors"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func TestNewSaveCommandErrors(t *testing.T) {
testCases := []struct {
name string
args []string
isTerminal bool
expectedError string
imageSaveFunc func(images []string) (io.ReadCloser, error)
}{
{
name: "wrong args",
args: []string{},
expectedError: "requires at least 1 argument.",
},
{
name: "output to terminal",
args: []string{"output", "file", "arg1"},
isTerminal: true,
expectedError: "cowardly refusing to save to a terminal. Use the -o flag or redirect",
},
{
name: "ImageSave fail",
args: []string{"arg1"},
isTerminal: false,
expectedError: "error saving image",
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
return io.NopCloser(strings.NewReader("")), errors.Errorf("error saving image")
},
},
{
name: "output directory does not exist",
args: []string{"-o", "fakedir/out.tar", "arg1"},
expectedError: "failed to save image: invalid output path: directory \"fakedir\" does not exist",
},
{
name: "output file is irregular",
args: []string{"-o", "/dev/null", "arg1"},
expectedError: "failed to save image: invalid output path: \"/dev/null\" must be a directory or a regular file",
},
}
for _, tc := range testCases {
test spring-cleaning This makes a quick pass through our tests; Discard output/err ---------------------------------------------- Many tests were testing for error-conditions, but didn't discard output. This produced a lot of noise when running the tests, and made it hard to discover if there were actual failures, or if the output was expected. For example: === RUN TestConfigCreateErrors Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: error creating config --- PASS: TestConfigCreateErrors (0.00s) And after discarding output: === RUN TestConfigCreateErrors --- PASS: TestConfigCreateErrors (0.00s) Use sub-tests where possible ---------------------------------------------- Some tests were already set-up to use test-tables, and even had a usable name (or in some cases "error" to check for). Change them to actual sub- tests. Same test as above, but now with sub-tests and output discarded: === RUN TestConfigCreateErrors === RUN TestConfigCreateErrors/requires_exactly_2_arguments === RUN TestConfigCreateErrors/requires_exactly_2_arguments#01 === RUN TestConfigCreateErrors/error_creating_config --- PASS: TestConfigCreateErrors (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments#01 (0.00s) --- PASS: TestConfigCreateErrors/error_creating_config (0.00s) PASS It's not perfect in all cases (in the above, there's duplicate "expected" errors, but Go conveniently adds "#01" for the duplicate). There's probably also various tests I missed that could still use the same changes applied; we can improve these in follow-ups. Set cmd.Args to prevent test-failures ---------------------------------------------- When running tests from my IDE, it compiles the tests before running, then executes the compiled binary to run the tests. Cobra doesn't like that, because in that situation `os.Args` is taken as argument for the command that's executed. The command that's tested now sees the test- flags as arguments (`-test.v -test.run ..`), which causes various tests to fail ("Command XYZ does not accept arguments"). # compile the tests: go test -c -o foo.test # execute the test: ./foo.test -test.v -test.run TestFoo === RUN TestFoo Error: "foo" accepts no arguments. The Cobra maintainers ran into the same situation, and for their own use have added a special case to ignore `os.Args` in these cases; https://github.com/spf13/cobra/blob/v1.8.1/command.go#L1078-L1083 args := c.args // Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155 if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" { args = os.Args[1:] } Unfortunately, that exception is too specific (only checks for `cobra.test`), so doesn't automatically fix the issue for other test-binaries. They did provide a `cmd.SetArgs()` utility for this purpose https://github.com/spf13/cobra/blob/v1.8.1/command.go#L276-L280 // SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden // particularly useful when testing. func (c *Command) SetArgs(a []string) { c.args = a } And the fix is to explicitly set the command's args to an empty slice to prevent Cobra from falling back to using `os.Args[1:]` as arguments. cmd := newSomeThingCommand() cmd.SetArgs([]string{}) Some tests already take this issue into account, and I updated some tests for this, but there's likely many other ones that can use the same treatment. Perhaps the Cobra maintainers would accept a contribution to make their condition less specific and to look for binaries ending with a `.test` suffix (which is what compiled binaries usually are named as). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2024-07-03 19:29:04 -04:00
tc := tc
t.Run(tc.name, func(t *testing.T) {
cli := test.NewFakeCli(&fakeClient{imageSaveFunc: tc.imageSaveFunc})
cli.Out().SetIsTerminal(tc.isTerminal)
cmd := NewSaveCommand(cli)
cmd.SetOut(io.Discard)
cmd.SetErr(io.Discard)
cmd.SetArgs(tc.args)
assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
})
}
}
func TestNewSaveCommandSuccess(t *testing.T) {
testCases := []struct {
args []string
isTerminal bool
imageSaveFunc func(images []string) (io.ReadCloser, error)
deferredFunc func()
}{
{
args: []string{"-o", "save_tmp_file", "arg1"},
isTerminal: true,
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
assert.Assert(t, is.Len(images, 1))
assert.Check(t, is.Equal("arg1", images[0]))
return io.NopCloser(strings.NewReader("")), nil
},
deferredFunc: func() {
test spring-cleaning This makes a quick pass through our tests; Discard output/err ---------------------------------------------- Many tests were testing for error-conditions, but didn't discard output. This produced a lot of noise when running the tests, and made it hard to discover if there were actual failures, or if the output was expected. For example: === RUN TestConfigCreateErrors Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: error creating config --- PASS: TestConfigCreateErrors (0.00s) And after discarding output: === RUN TestConfigCreateErrors --- PASS: TestConfigCreateErrors (0.00s) Use sub-tests where possible ---------------------------------------------- Some tests were already set-up to use test-tables, and even had a usable name (or in some cases "error" to check for). Change them to actual sub- tests. Same test as above, but now with sub-tests and output discarded: === RUN TestConfigCreateErrors === RUN TestConfigCreateErrors/requires_exactly_2_arguments === RUN TestConfigCreateErrors/requires_exactly_2_arguments#01 === RUN TestConfigCreateErrors/error_creating_config --- PASS: TestConfigCreateErrors (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments#01 (0.00s) --- PASS: TestConfigCreateErrors/error_creating_config (0.00s) PASS It's not perfect in all cases (in the above, there's duplicate "expected" errors, but Go conveniently adds "#01" for the duplicate). There's probably also various tests I missed that could still use the same changes applied; we can improve these in follow-ups. Set cmd.Args to prevent test-failures ---------------------------------------------- When running tests from my IDE, it compiles the tests before running, then executes the compiled binary to run the tests. Cobra doesn't like that, because in that situation `os.Args` is taken as argument for the command that's executed. The command that's tested now sees the test- flags as arguments (`-test.v -test.run ..`), which causes various tests to fail ("Command XYZ does not accept arguments"). # compile the tests: go test -c -o foo.test # execute the test: ./foo.test -test.v -test.run TestFoo === RUN TestFoo Error: "foo" accepts no arguments. The Cobra maintainers ran into the same situation, and for their own use have added a special case to ignore `os.Args` in these cases; https://github.com/spf13/cobra/blob/v1.8.1/command.go#L1078-L1083 args := c.args // Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155 if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" { args = os.Args[1:] } Unfortunately, that exception is too specific (only checks for `cobra.test`), so doesn't automatically fix the issue for other test-binaries. They did provide a `cmd.SetArgs()` utility for this purpose https://github.com/spf13/cobra/blob/v1.8.1/command.go#L276-L280 // SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden // particularly useful when testing. func (c *Command) SetArgs(a []string) { c.args = a } And the fix is to explicitly set the command's args to an empty slice to prevent Cobra from falling back to using `os.Args[1:]` as arguments. cmd := newSomeThingCommand() cmd.SetArgs([]string{}) Some tests already take this issue into account, and I updated some tests for this, but there's likely many other ones that can use the same treatment. Perhaps the Cobra maintainers would accept a contribution to make their condition less specific and to look for binaries ending with a `.test` suffix (which is what compiled binaries usually are named as). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2024-07-03 19:29:04 -04:00
_ = os.Remove("save_tmp_file")
},
},
{
args: []string{"arg1", "arg2"},
isTerminal: false,
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
assert.Assert(t, is.Len(images, 2))
assert.Check(t, is.Equal("arg1", images[0]))
assert.Check(t, is.Equal("arg2", images[1]))
return io.NopCloser(strings.NewReader("")), nil
},
},
}
for _, tc := range testCases {
test spring-cleaning This makes a quick pass through our tests; Discard output/err ---------------------------------------------- Many tests were testing for error-conditions, but didn't discard output. This produced a lot of noise when running the tests, and made it hard to discover if there were actual failures, or if the output was expected. For example: === RUN TestConfigCreateErrors Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: "create" requires exactly 2 arguments. See 'create --help'. Usage: create [OPTIONS] CONFIG file|- [flags] Create a config from a file or STDIN Error: error creating config --- PASS: TestConfigCreateErrors (0.00s) And after discarding output: === RUN TestConfigCreateErrors --- PASS: TestConfigCreateErrors (0.00s) Use sub-tests where possible ---------------------------------------------- Some tests were already set-up to use test-tables, and even had a usable name (or in some cases "error" to check for). Change them to actual sub- tests. Same test as above, but now with sub-tests and output discarded: === RUN TestConfigCreateErrors === RUN TestConfigCreateErrors/requires_exactly_2_arguments === RUN TestConfigCreateErrors/requires_exactly_2_arguments#01 === RUN TestConfigCreateErrors/error_creating_config --- PASS: TestConfigCreateErrors (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments (0.00s) --- PASS: TestConfigCreateErrors/requires_exactly_2_arguments#01 (0.00s) --- PASS: TestConfigCreateErrors/error_creating_config (0.00s) PASS It's not perfect in all cases (in the above, there's duplicate "expected" errors, but Go conveniently adds "#01" for the duplicate). There's probably also various tests I missed that could still use the same changes applied; we can improve these in follow-ups. Set cmd.Args to prevent test-failures ---------------------------------------------- When running tests from my IDE, it compiles the tests before running, then executes the compiled binary to run the tests. Cobra doesn't like that, because in that situation `os.Args` is taken as argument for the command that's executed. The command that's tested now sees the test- flags as arguments (`-test.v -test.run ..`), which causes various tests to fail ("Command XYZ does not accept arguments"). # compile the tests: go test -c -o foo.test # execute the test: ./foo.test -test.v -test.run TestFoo === RUN TestFoo Error: "foo" accepts no arguments. The Cobra maintainers ran into the same situation, and for their own use have added a special case to ignore `os.Args` in these cases; https://github.com/spf13/cobra/blob/v1.8.1/command.go#L1078-L1083 args := c.args // Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155 if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" { args = os.Args[1:] } Unfortunately, that exception is too specific (only checks for `cobra.test`), so doesn't automatically fix the issue for other test-binaries. They did provide a `cmd.SetArgs()` utility for this purpose https://github.com/spf13/cobra/blob/v1.8.1/command.go#L276-L280 // SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden // particularly useful when testing. func (c *Command) SetArgs(a []string) { c.args = a } And the fix is to explicitly set the command's args to an empty slice to prevent Cobra from falling back to using `os.Args[1:]` as arguments. cmd := newSomeThingCommand() cmd.SetArgs([]string{}) Some tests already take this issue into account, and I updated some tests for this, but there's likely many other ones that can use the same treatment. Perhaps the Cobra maintainers would accept a contribution to make their condition less specific and to look for binaries ending with a `.test` suffix (which is what compiled binaries usually are named as). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2024-07-03 19:29:04 -04:00
tc := tc
t.Run(strings.Join(tc.args, " "), func(t *testing.T) {
cmd := NewSaveCommand(test.NewFakeCli(&fakeClient{
imageSaveFunc: func(images []string) (io.ReadCloser, error) {
return io.NopCloser(strings.NewReader("")), nil
},
}))
cmd.SetOut(io.Discard)
cmd.SetErr(io.Discard)
cmd.SetArgs(tc.args)
assert.NilError(t, cmd.Execute())
if tc.deferredFunc != nil {
tc.deferredFunc()
}
})
}
}