diff --git a/src/git.rs b/src/git.rs
index 317d016..724824f 100644
--- a/src/git.rs
+++ b/src/git.rs
@@ -1,36 +1,106 @@
 use std::path::Path;
 use std::process::Command;
 
-use url::Url;
-
 pub struct Git;
 
 impl Git {
-    pub fn clone(url: &Url, dest: &Path) {
+    pub fn clone(url: &str, dest: &Path, dir: &str) {
         let dest = dest.canonicalize().unwrap();
         let mut child = Command::new("git")
-            .args(["clone", url.as_str()])
+            .args(["clone", url, dir])
             .current_dir(dest)
             .spawn()
             .expect("unable to obtain Docker version");
         child.wait().unwrap();
     }
 
-    pub fn pull(dest: &Path, branch: &str) {
-        let dest = dest.canonicalize().unwrap();
-        Command::new("git")
-            .current_dir(dest)
+    pub fn pull(repo: &Path, branch: &str) {
+        let repo = repo.canonicalize().unwrap();
+        let mut c = Command::new("git")
+            .current_dir(repo)
             .args(["pull", "origin", branch])
             .spawn()
             .expect("unable to obtain Docker version");
+        c.wait().unwrap();
     }
 
-    pub fn push(branch: &str, dest: &Path) {
-        let dest = dest.canonicalize().unwrap();
-        let output = Command::new("git")
-            .current_dir(dest)
+    pub fn push(branch: &str, repo: &Path) {
+        let repo = repo.canonicalize().unwrap();
+        let mut child = Command::new("git")
+            .current_dir(repo)
             .args(["push", "origin", branch])
             .spawn()
             .expect("unable to get logs");
+        child.wait().unwrap();
+    }
+
+    pub fn checkout_commit(commit: &str, repo: &Path) {
+        let repo = repo.canonicalize().unwrap();
+        let mut child = Command::new("git")
+            .current_dir(repo)
+            .args(["checkout", commit])
+            .spawn()
+            .expect("unable to get logs");
+        child.wait().unwrap();
+    }
+
+    pub fn files_changed_from_previous_commit(repo: &Path) -> Vec<String> {
+        let repo = repo.canonicalize().unwrap();
+        let out = Command::new("git")
+            .current_dir(repo)
+            .args(["--no-pager", "diff", "--name-only", "HEAD^"])
+            .output()
+            .expect("unable to get logs");
+        let out = String::from_utf8(out.stdout).unwrap();
+        let mut s = Vec::default();
+        for f in out.lines() {
+            s.push(f.trim().to_owned())
+        }
+        s
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::fs;
+
+    use super::*;
+    use mktemp::Temp;
+
+    #[test]
+    fn git_works() {
+        let tmp = Temp::new_dir().unwrap();
+        let tmp = tmp.as_path();
+        let upstream = "/tmp/git_cmd_init_tmp/repo";
+        let commits_file = "/tmp/git_cmd_init_tmp/commits";
+        let script = "./tests/git_cmd_init.sh";
+
+        Command::new(script).args(["init"]).output().unwrap();
+
+        Git::clone(upstream, tmp, "git_works");
+        let repo = tmp.join("git_works");
+        let contents = fs::read_to_string(repo.join("2_commit.txt")).unwrap();
+        let commits = fs::read_to_string(commits_file).unwrap();
+        assert_eq!(commits.lines().into_iter().count(), 2);
+        assert!(contents.contains("bar"));
+        assert!(!contents.contains("new commit"));
+
+        let first_commit = commits.lines().last().unwrap();
+
+        Git::checkout_commit(first_commit, repo.as_path());
+        assert!(!repo.join("2_commit.txt").exists());
+
+        Git::checkout_commit("master", repo.as_path());
+        assert!(repo.join("2_commit.txt").exists());
+
+        Command::new(script).args(["update"]).output().unwrap();
+        Git::pull(&repo, "master");
+
+        let new_commits = fs::read_to_string(commits_file).unwrap();
+        assert_eq!(new_commits.lines().into_iter().count(), 3);
+
+        let changes = Git::files_changed_from_previous_commit(&repo);
+        assert_eq!(changes.len(), 1);
+        assert_eq!(changes.get(0).unwrap(), "3_commit.txt");
     }
 }
diff --git a/tests/git_cmd_init.sh b/tests/git_cmd_init.sh
new file mode 100755
index 0000000..6cde8e8
--- /dev/null
+++ b/tests/git_cmd_init.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+set -euo pipefail
+
+readonly DIR=/tmp/git_cmd_init_tmp
+readonly REPO=$DIR/repo
+
+commit() {
+	git add --all
+	git commit \
+		--author="ftest-test-util-script <ftest-test-util-script@example.org>" \
+		--message="$1"
+}
+
+write_commits_to_file() {
+    pushd $REPO
+    popd
+    rm -rf $DIR/commits
+    git log --pretty=oneline | cut -d ' ' -f 1 > $DIR/commits
+}
+
+
+
+init() {
+    rm -rf $DIR || true
+    mkdir -p $REPO
+    cd $REPO
+    git init
+    echo "foo" > 1_commit.txt
+    commit "first commit"
+    echo "bar" > 2_commit.txt
+    commit "second commit"
+    write_commits_to_file
+}
+
+
+update() {
+    cd $REPO
+    echo "bar" >> 3_commit.txt
+    commit "new commit"
+    write_commits_to_file
+}
+
+$@
+
+exit 0