Add a run package responsible for running git commands

- Add better git error handling
- Move repo helpers into a separate package

pkg/test/testrepos.go

@@ -0,0 +1,168 @@
+package test
+
+import (
+	"git-get/pkg/io"
+	"os"
+	"testing"
+)
+
+// Repo represents a test repository.
+// It embeds testing.T so that any error thrown while creating a test repo will cause a t.Fatal call.
+type Repo struct {
+	path string
+	t    *testing.T
+}
+
+func (r *Repo) Path() string {
+	return r.path
+}
+
+// TODO: this should be a method of a tempDir, not a repo
+// Automatically remove test repo when the test is over
+func (r *Repo) cleanup() {
+	err := os.RemoveAll(r.path)
+	if err != nil {
+		r.t.Errorf("failed removing test repo directory %s", r.path)
+	}
+}
+
+func RepoEmpty(t *testing.T) *Repo {
+	dir, err := io.TempDir()
+	checkFatal(t, err)
+
+	r := &Repo{
+		path: dir,
+		t:    t,
+	}
+
+	t.Cleanup(r.cleanup)
+
+	r.init()
+	return r
+}
+
+func RepoWithUntracked(t *testing.T) *Repo {
+	r := RepoEmpty(t)
+	r.writeFile("README.md", "I'm a readme file")
+
+	return r
+}
+
+func RepoWithStaged(t *testing.T) *Repo {
+	r := RepoEmpty(t)
+	r.writeFile("README.md", "I'm a readme file")
+	r.stageFile("README.md")
+
+	return r
+}
+
+func RepoWithCommit(t *testing.T) *Repo {
+	r := RepoEmpty(t)
+	r.writeFile("README.md", "I'm a readme file")
+	r.stageFile("README.md")
+	r.commit("Initial commit")
+
+	return r
+}
+
+func RepoWithUncommittedAndUntracked(t *testing.T) *Repo {
+	r := RepoEmpty(t)
+	r.writeFile("README.md", "I'm a readme file")
+	r.stageFile("README.md")
+	r.commit("Initial commit")
+	r.writeFile("README.md", "These changes won't be committed")
+	r.writeFile("untracked.txt", "I'm untracked")
+
+	return r
+}
+
+func RepoWithBranch(t *testing.T) *Repo {
+	r := RepoWithCommit(t)
+	r.branch("feature/branch")
+	r.checkout("feature/branch")
+
+	return r
+}
+
+func RepoWithTag(t *testing.T) *Repo {
+	r := RepoWithCommit(t)
+	r.tag("v0.0.1")
+	r.checkout("v0.0.1")
+
+	return r
+}
+
+func RepoWithBranchWithUpstream(t *testing.T) *Repo {
+	origin := RepoWithCommit(t)
+	origin.branch("feature/branch")
+
+	r := origin.clone()
+	r.checkout("feature/branch")
+	return r
+}
+
+func RepoWithBranchWithoutUpstream(t *testing.T) *Repo {
+	origin := RepoWithCommit(t)
+
+	r := origin.clone()
+	r.branch("feature/branch")
+	r.checkout("feature/branch")
+	return r
+}
+
+func RepoWithBranchAhead(t *testing.T) *Repo {
+	origin := RepoWithCommit(t)
+	origin.branch("feature/branch")
+
+	r := origin.clone()
+	r.checkout("feature/branch")
+
+	r.writeFile("local.new", "local.new")
+	r.stageFile("local.new")
+	r.commit("local.new")
+
+	return r
+}
+
+func RepoWithBranchBehind(t *testing.T) *Repo {
+	origin := RepoWithCommit(t)
+	origin.branch("feature/branch")
+	origin.checkout("feature/branch")
+
+	r := origin.clone()
+	r.checkout("feature/branch")
+
+	origin.writeFile("origin.new", "origin.new")
+	origin.stageFile("origin.new")
+	origin.commit("origin.new")
+
+	r.fetch()
+
+	return r
+}
+
+// returns a repo with 2 commits ahead and 1 behind
+func RepoWithBranchAheadAndBehind(t *testing.T) *Repo {
+	origin := RepoWithCommit(t)
+	origin.branch("feature/branch")
+	origin.checkout("feature/branch")
+
+	r := origin.clone()
+	r.checkout("feature/branch")
+
+	origin.writeFile("origin.new", "origin.new")
+	origin.stageFile("origin.new")
+	origin.commit("origin.new")
+
+	r.writeFile("local.new", "local.new")
+	r.stageFile("local.new")
+	r.commit("local.new")
+
+	r.writeFile("local.new2", "local.new2")
+	r.stageFile("local.new2")
+	r.commit("local.new2")
+
+	r.fetch()
+
+	return r
+}