asteris-llc/converge

// Copyright © 2016 Asteris, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package rpm_test

import (
    "fmt"
    "os/exec"
    "testing"

    "github.com/asteris-llc/converge/resource/package/rpm"
    "github.com/stretchr/testify/assert"
    "github.com/stretchr/testify/mock"
)

// TestYumInstalledVersion validates that installation status is successfully
// validated
func TestYumInstalledVersion(t *testing.T) {
    t.Parallel()

    t.Run("when installed", func(t *testing.T) {
        expected := "foo-0.1.2.3"
        runner := newRunner(expected, nil)
        y := &rpm.YumManager{Sys: runner}
        result, found := y.InstalledVersion("foo1")
        assert.True(t, found)
        assert.Equal(t, expected, string(result))
    })

    t.Run("when not installed", func(t *testing.T) {
        expected := ""
        y := &rpm.YumManager{Sys: newRunner("", makeExitError("", 1))}
        result, found := y.InstalledVersion("foo1")
        assert.False(t, found)
        assert.Equal(t, expected, string(result))
    })
}

// TestYumInstallPackage validates that we successfully ask yum to install a
// package
func TestYumInstallPackage(t *testing.T) {
    t.Parallel()

    t.Run("when installed", func(t *testing.T) {
        pkg := "foo1"
        runner := newRunner("", nil)
        y := &rpm.YumManager{Sys: runner}
        _, err := y.InstallPackage(pkg)
        assert.NoError(t, err)
        runner.AssertNumberOfCalls(t, "Run", 1)
    })

    t.Run("when not installed", func(t *testing.T) {
        pkg := "foo1"
        runner := newRunner("", makeExitError("", 1))
        y := &rpm.YumManager{Sys: runner}
        y.InstallPackage(pkg)
        runner.AssertNumberOfCalls(t, "Run", 2)
    })

    t.Run("when installation error", func(t *testing.T) {
        pkg := "foo1"
        runner := newRunner("", makeExitError("", 1))
        y := &rpm.YumManager{Sys: runner}
        _, err := y.InstallPackage(pkg)
        assert.Error(t, err)
        runner.AssertNumberOfCalls(t, "Run", 2)
    })
}

// MockRunner mocks out SysCaller
type MockRunner struct {
    mock.Mock
}

// Run mocks out Run
func (m *MockRunner) Run(cmd string) ([]byte, error) {
    args := m.Called(1)
    return args.Get(0).([]byte), args.Error(1)
}

// newRunner creates a new MockRunner that returns the output string and error
func newRunner(output string, err error) *MockRunner {
    m := &MockRunner{}
    m.On("Run", mock.Anything).Return([]byte(output), err)
    return m
}

// makeExitError generates a new ExitError
func makeExitError(stderr string, exitCode uint32) error {
    cmd := fmt.Sprintf("echo %q 1>&2; exit %d", stderr, exitCode)
    _, err := exec.Command("/bin/bash", "-c", cmd).Output()
    return err
}

// queryString generates an RPM query string
func queryString(pkg string) string {
    return "rpm -q " + pkg
}

// installString generates a yum install string
func installString(pkg string) string {
    return "yum install -y " + pkg
}

// removeString generates a yum remove string
func removeString(pkg string) string {
    return "yum remove -y " + pkg
}