diff --git a/Cargo.lock b/Cargo.lock
index c96f93f..45aeb77 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -88,12 +97,30 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "difflib"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6184e33543162437515c2e2b48714794e37845ec9851711914eec9d308f6ebe8"
+
+[[package]]
+name = "downcast"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
+
 [[package]]
 name = "dyn-clone"
 version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68b0cf012f1230e43cd00ebb729c6bb58707ecfa8ad08b52ef3a4ccd2697fc30"
 
+[[package]]
+name = "either"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+
 [[package]]
 name = "errno"
 version = "0.2.8"
@@ -115,12 +142,28 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "float-cmp"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "fragile"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
+
 [[package]]
 name = "git-mob"
 version = "0.1.0"
 dependencies = [
  "clap",
  "inquire",
+ "mockall",
 ]
 
 [[package]]
@@ -173,6 +216,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -210,6 +262,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
 [[package]]
 name = "mio"
 version = "0.8.6"
@@ -222,6 +280,33 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "mockall"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50e4a1c770583dac7ab5e2f6c139153b783a53a1bbee9729613f193e59828326"
+dependencies = [
+ "cfg-if",
+ "downcast",
+ "fragile",
+ "lazy_static",
+ "mockall_derive",
+ "predicates",
+ "predicates-tree",
+]
+
+[[package]]
+name = "mockall_derive"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "832663583d5fa284ca8810bf7015e46c9fff9622d3cf34bd1eea5003fec06dd0"
+dependencies = [
+ "cfg-if",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "newline-converter"
 version = "0.2.2"
@@ -231,6 +316,21 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "normalize-line-endings"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
+
+[[package]]
+name = "num-traits"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.17.1"
@@ -266,6 +366,36 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "predicates"
+version = "2.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59230a63c37f3e18569bdb90e4a89cbf5bf8b06fea0b84e65ea10cc4df47addd"
+dependencies = [
+ "difflib",
+ "float-cmp",
+ "itertools",
+ "normalize-line-endings",
+ "predicates-core",
+ "regex",
+]
+
+[[package]]
+name = "predicates-core"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f883590242d3c6fc5bf50299011695fa6590c2c70eac95ee1bdb9a733ad1a2"
+
+[[package]]
+name = "predicates-tree"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54ff541861505aabf6ea722d2131ee980b8276e10a1297b94e896dd8b621850d"
+dependencies = [
+ "predicates-core",
+ "termtree",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -317,6 +447,23 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "regex"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
+
 [[package]]
 name = "rustix"
 version = "0.36.8"
@@ -399,6 +546,12 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "termtree"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95059e91184749cb66be6dc994f67f182b6d897cb3df74a5bf66b5e709295fd8"
+
 [[package]]
 name = "thiserror"
 version = "1.0.38"
diff --git a/Cargo.toml b/Cargo.toml
index a72b941..37c4a7f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,6 @@ description = "A CLI app which can help users automatically add co-author(s) to
 [dependencies]
 clap = { version = "4.1.8", features = ["derive"] }
 inquire = "0.6.0"
+
+[dev-dependencies]
+mockall = "0.11.3"
diff --git a/src/coauthor_repo.rs b/src/coauthor_repo.rs
index 0db77b7..faf09d9 100644
--- a/src/coauthor_repo.rs
+++ b/src/coauthor_repo.rs
@@ -1,5 +1,8 @@
 use std::process::Command;
 
+#[cfg(test)]
+use mockall::{automock, predicate::*};
+#[cfg_attr(test, automock)]
 pub trait CoauthorRepo {
     fn list(&self) -> Vec<String>;
     fn get(&self, key: &str) -> String;
diff --git a/src/commands/mob.rs b/src/commands/mob.rs
index 044daad..bcf195f 100644
--- a/src/commands/mob.rs
+++ b/src/commands/mob.rs
@@ -8,10 +8,21 @@ pub struct Mob {
     /// Sets active co-author(s) for pair/mob programming
     #[arg(short='w', long="with", num_args=0.., value_name="COAUTHOR_KEY")]
     with: Option<Vec<String>>,
+    /// Clears mob/pair programming session. Going solo!
+    #[arg(short = 'c', long = "clear")]
+    clear: bool,
 }
 
 impl Mob {
     pub fn handle(&self, coauthor_repo: &dyn CoauthorRepo) {
+        if self.clear {
+            coauthor_repo.deactivate_all();
+        }
+
+        if self.with.is_none() {
+            return;
+        }
+
         let coauthor_keys = self.with.as_ref().unwrap();
 
         match coauthor_keys.len() {
@@ -51,3 +62,25 @@ impl Mob {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::coauthor_repo::MockCoauthorRepo;
+
+    #[test]
+    fn test_clear_deactivates_all_coauthors() {
+        let mut mock_coauthor_repo = MockCoauthorRepo::new();
+        mock_coauthor_repo
+            .expect_deactivate_all()
+            .once()
+            .return_const({});
+
+        let mob = Mob {
+            with: None,
+            clear: true,
+        };
+
+        mob.handle(&mock_coauthor_repo);
+    }
+}