add first test

3 files changed, 173 insertions, 2 deletions

diff --git a/pkg/rtree/get_test.go b/pkg/rtree/get_test.go
new file mode 100644
index 0000000..be7e092
--- /dev/null
+++ b/pkg/rtree/get_test.go
@@ -0,0 +1,42 @@
+/*******************************************************************************
+*
+* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
+*
+* This program is free software: you can redistribute it and/or modify it under
+* the terms of the GNU General Public License as published by the Free Software
+* Foundation, either version 3 of the License, or (at your option) any later
+* version.
+*
+* This program is distributed in the hope that it will be useful, but WITHOUT ANY
+* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License along with
+* this program. If not, see <http://www.gnu.org/licenses/>.
+*
+*******************************************************************************/
+
+package rtree
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestGetRepoFromIndex(t *testing.T) {
+	idx := Index{
+		Repos: []*Repo{
+			{
+				CheckoutPath: "github.com/git/git",
+				Remotes: []Remote{
+					{Name: "origin", URL: "gh:git/git"},
+				},
+			},
+		},
+	}
+	Test{
+		Args:         []string{"get", "gh:git/git"},
+		Index:        idx,
+		ExpectOutput: filepath.Join(RootPath, "/github.com/git/git") + "\n",
+	}.Run(t, "TestGetRepoFromIndex")
+}
diff --git a/pkg/rtree/main.go b/pkg/rtree/main.go
index f08126e..762f457 100644
--- a/pkg/rtree/main.go
+++ b/pkg/rtree/main.go
@@ -24,8 +24,11 @@ import (
 	"github.com/majewsky/gofu/pkg/cli"
 )
 
-//Exec executes the rtree applet and does not return. The argument is os.Args
-//minus the leading "rtree" or "gofu rtree".
+//Exec executes the rtree applet and returns an exit code (0 for success, >0
+//for error). The argument is os.Args minus the leading "rtree" or "gofu
+//rtree". All side-effects (reading from stdin, writing to stdout/stderr,
+//executing other programs) pass through cli.Interface and can be intercepted
+//there for the purpose of testing.
 func Exec(args []string) int {
 	if !Init() {
 		return 1
diff --git a/pkg/rtree/shared_test.go b/pkg/rtree/shared_test.go
new file mode 100644
index 0000000..209acb4
--- /dev/null
+++ b/pkg/rtree/shared_test.go
@@ -0,0 +1,126 @@
+/*******************************************************************************
+*
+* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
+*
+* This program is free software: you can redistribute it and/or modify it under
+* the terms of the GNU General Public License as published by the Free Software
+* Foundation, either version 3 of the License, or (at your option) any later
+* version.
+*
+* This program is distributed in the hope that it will be useful, but WITHOUT ANY
+* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License along with
+* this program. If not, see <http://www.gnu.org/licenses/>.
+*
+*******************************************************************************/
+
+package rtree
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+
+	"github.com/majewsky/gofu/pkg/cli"
+	yaml "gopkg.in/yaml.v2"
+)
+
+//Path to a directory where tests can put their index files.
+var indexTmpDir = filepath.Join(os.TempDir(), fmt.Sprintf("rtree-test-%d", os.Getpid()))
+
+func TestMain(m *testing.M) {
+	//make sure that test does not accidentally access user's actual rtree or index
+	os.Setenv("HOME", "")
+	os.Setenv("GOPATH", "")
+	//setup test configuration
+	RootPath = "/unittest/gopath/src"
+	RemoteAliases = []*RemoteAlias{
+		{Alias: "gh:", Replacement: "https://github.com/"},
+		{Alias: "my/", Replacement: "git@git.example.com:"},
+	}
+
+	exitCode := m.Run()
+
+	//shared teardown
+	os.RemoveAll(indexTmpDir)
+
+	os.Exit(exitCode)
+}
+
+//Test describes a call to Main(), the environment that's given to it, and the
+//assertions that are checked after the call returns.
+type Test struct {
+	Args          []string
+	Input         string
+	Index         Index
+	ExpectFailure bool
+	ExpectOutput  string
+	ExpectError   string
+	ExpectIndex   *Index //if nil, .Index will be used instead
+}
+
+func (test Test) Run(t *testing.T, testName string) {
+	//write index file, if any
+	IndexPath = filepath.Join(indexTmpDir, testName+".yaml")
+	if test.Index.Repos != nil {
+		err := test.Index.Write()
+		if err != nil {
+			t.Fatalf("%s: cannot write index to %s: %s", testName, IndexPath, err.Error())
+		}
+	}
+
+	//setup cli.Interface for test
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	cli.SetupInterface(bytes.NewReader([]byte(test.Input)), &stdout, &stderr, nil)
+
+	//check exit code
+	exitCode := Exec(test.Args)
+	switch {
+	case exitCode == 0 && test.ExpectFailure:
+		t.Errorf("%s: expected failure, but returned success", testName)
+	case exitCode != 0 && !test.ExpectFailure:
+		t.Errorf("%s: expected success, but returned failure", testName)
+	}
+
+	//check output
+	output := string(stdout.Bytes())
+	if output != test.ExpectOutput {
+		t.Errorf("%s: expected stdout %#v, but got %#v", testName, test.ExpectOutput, output)
+	}
+	output = string(stderr.Bytes())
+	if output != test.ExpectError {
+		t.Errorf("%s: expected stderr %#v, but got %#v", testName, test.ExpectError, output)
+	}
+
+	//check index
+	idx := &test.Index
+	if test.ExpectIndex != nil {
+		idx = test.ExpectIndex
+	}
+	expectedIdxStr, err := yaml.Marshal(idx)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	actualIdxStr, err := ioutil.ReadFile(IndexPath)
+	if err != nil {
+		t.Fatalf("%s: could not read index from %s: %s", testName, IndexPath, err.Error())
+	}
+	if string(expectedIdxStr) != string(actualIdxStr) {
+		t.Errorf("%s: index does not match expectation after test; diff follows", testName)
+		cmd := exec.Command("diff", "-u", "-", IndexPath)
+		cmd.Stdin = bytes.NewReader([]byte(expectedIdxStr))
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		err := cmd.Wait()
+		if err != nil {
+			t.Fatal(err.Error())
+		}
+	}
+}