diff --git a/.github/actions/cargo-tarpaulin-action/action.yml b/.github/actions/cargo-tarpaulin-action/action.yml
new file mode 100644
index 0000000..b656b33
--- /dev/null
+++ b/.github/actions/cargo-tarpaulin-action/action.yml
@@ -0,0 +1,22 @@
+name: 'cargo tarpaulin'
+description: 'Gather Rust code coverage information with Tarpaulin'
+inputs:
+  version:
+    description: 'The version of cargo-tarpaulin to install'
+    required: true
+    default: '0.19.0'
+
+  args:
+    required: false
+    description: 'Extra command line arguments passed to cargo-tarpaulin'
+
+  out-type:
+    description: 'Output format of coverage report [possible values: Json, Toml, Stdout, Xml, Html, Lcov]'
+    required: false
+    default: 'Xml'
+
+runs:
+  using: 'composite'
+  steps:
+    - run: ${{ github.action_path }}/cargo-tarpaulin.sh ${{ inputs.out-type }} ${{ inputs.version }} ${{ inputs.args }}
+      shell: bash
diff --git a/.github/actions/cargo-tarpaulin-action/cargo-tarpaulin.sh b/.github/actions/cargo-tarpaulin-action/cargo-tarpaulin.sh
new file mode 100755
index 0000000..363b0d1
--- /dev/null
+++ b/.github/actions/cargo-tarpaulin-action/cargo-tarpaulin.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+sudo apt-get update -y
+sudo apt-get install -y --no-install-recommends openssl taskwarrior
+
+out_type="$1"
+version="$2"
+args="$3"
+tar_file="cargo-tarpaulin-${version}-travis.tar.gz"
+
+wget "https://github.com/xd009642/tarpaulin/releases/download/${version}/${tar_file}"
+tar zxvf "$tar_file"
+chmod +x cargo-tarpaulin
+
+exec env RUST_LOG=debug ./cargo-tarpaulin tarpaulin --ignore-tests -o "$out_type" $args
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b5548fb..b590c5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
               options: --manifest-path=Cargo.toml
 
   build_and_test:
-    name: contextswitch-api
+    name: Build & test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -41,9 +41,8 @@ jobs:
           args: -- -D warnings
 
       - name: Run cargo-tarpaulin
-        uses: actions-rs/tarpaulin@v0.1
+        uses: ./.github/actions/cargo-tarpaulin-action/
         with:
-          version: '0.15.0'
           args: '-- --test-threads 1'
 
       - name: Upload to codecov.io
diff --git a/src/lib.rs b/src/lib.rs
index 4805483..2e282c0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,12 +12,16 @@ pub mod taskwarrior;
 
 #[derive(Deserialize)]
 struct TaskQuery {
-    filter: String,
+    filter: Option<String>,
 }
 
 #[tracing::instrument(level = "debug", skip(task_query))]
 async fn list_tasks(task_query: web::Query<TaskQuery>) -> Result<HttpResponse, Error> {
-    let tasks = contextswitch::export(task_query.filter.split(' ').collect())?;
+    let filter = task_query
+        .filter
+        .as_ref()
+        .map_or(vec![], |filter| filter.split(' ').collect());
+    let tasks = contextswitch::export(filter)?;
 
     Ok(HttpResponse::Ok()
         .content_type("application/json")
diff --git a/src/taskwarrior.rs b/src/taskwarrior.rs
index 74d30dc..914a456 100644
--- a/src/taskwarrior.rs
+++ b/src/taskwarrior.rs
@@ -7,6 +7,7 @@ use std::io::Error;
 use std::path::Path;
 use std::process::Command;
 use std::str;
+use tracing::debug;
 use uuid::Uuid;
 
 #[derive(Debug, Serialize, Deserialize, PartialEq)]
@@ -44,29 +45,9 @@ pub struct Task {
     pub contextswitch: Option<String>,
 }
 
-pub fn load_config(task_data_location: Option<&str>) -> String {
-    if let Ok(taskrc_location) = env::var("TASKRC") {
-        let mut taskrc = Ini::new();
-        taskrc
-            .load(&taskrc_location)
-            .unwrap_or_else(|_| panic!("Cannot load taskrc file {}", taskrc_location));
-        return taskrc.get("default", "data.location").unwrap_or_else(|| {
-            panic!(
-                "'data.location' must be set in taskrc file {}",
-                taskrc_location
-            )
-        });
-    }
-
-    let data_location = task_data_location
-        .map(|s| s.to_string())
-        .unwrap_or_else(|| {
-            env::var("TASK_DATA_LOCATION")
-                .expect("Expecting TASKRC or TASK_DATA_LOCATION environment variable value")
-        });
-
+fn write_default_config(data_location: &str) -> String {
     let mut taskrc = Ini::new();
-    taskrc.setstr("default", "data.location", Some(&data_location));
+    taskrc.setstr("default", "data.location", Some(data_location));
     taskrc.setstr("default", "uda.contextswitch.type", Some("string"));
     taskrc.setstr(
         "default",
@@ -79,25 +60,63 @@ pub fn load_config(task_data_location: Option<&str>) -> String {
     let taskrc_location = taskrc_path.to_str().unwrap();
     taskrc.write(taskrc_location).unwrap();
 
-    env::set_var("TASKRC", taskrc_location);
-
-    data_location
+    taskrc_location.into()
 }
 
+pub fn load_config(task_data_location: Option<&str>) -> String {
+    if let Ok(taskrc_location) = env::var("TASKRC") {
+        let mut taskrc = Ini::new();
+        taskrc
+            .load(&taskrc_location)
+            .unwrap_or_else(|_| panic!("Cannot load taskrc file {}", taskrc_location));
+        let data_location = taskrc.get("default", "data.location").unwrap_or_else(|| {
+            panic!(
+                "'data.location' must be set in taskrc file {}",
+                taskrc_location
+            )
+        });
+        debug!(
+            "Extracted data location `{}` from existing taskrc `{}`",
+            data_location, taskrc_location
+        );
+
+        data_location
+    } else {
+        let data_location = task_data_location
+            .map(|s| s.to_string())
+            .unwrap_or_else(|| {
+                env::var("TASK_DATA_LOCATION")
+                    .expect("Expecting TASKRC or TASK_DATA_LOCATION environment variable value")
+            });
+        let taskrc_location = write_default_config(&data_location);
+
+        env::set_var("TASKRC", &taskrc_location);
+        debug!("Default taskrc written in `{}`", &taskrc_location);
+
+        data_location
+    }
+}
+
+#[tracing::instrument(level = "debug")]
 pub fn export(filters: Vec<&str>) -> Result<Vec<Task>, Error> {
     let mut args = vec!["export"];
     args.extend(filters);
     let export_output = Command::new("task").args(args).output()?;
+    let output = String::from_utf8(export_output.stdout.clone()).unwrap();
+    debug!("export output: {}", output);
 
     let tasks: Vec<Task> = serde_json::from_slice(&export_output.stdout)?;
 
     Ok(tasks)
 }
 
+#[tracing::instrument(level = "debug")]
 pub fn add(add_args: Vec<&str>) -> Result<(), Error> {
     let mut args = vec!["add"];
     args.extend(add_args);
-    Command::new("task").args(args).output()?;
+    let add_output = Command::new("task").args(args).output()?;
+    let output = String::from_utf8(add_output.stdout).unwrap();
+    debug!("add output: {}", output);
 
     Ok(())
 }
diff --git a/tests/task.rs b/tests/task.rs
index 17e4fa8..9212647 100644
--- a/tests/task.rs
+++ b/tests/task.rs
@@ -5,13 +5,13 @@ use contextswitch_types::Task;
 
 #[tokio::test]
 async fn list_tasks() {
-    let task_data_path = test_helper::setup_tasks();
     let address = test_helper::spawn_app();
+    let task_data_path = test_helper::setup_tasks();
     let client = reqwest::Client::new();
     taskwarrior::add(vec!["test1", "contextswitch:'{\"test\": 1}'"]).unwrap();
 
     let response: reqwest::Response = client
-        .get(&format!("{}/tasks?filter=ls", &address))
+        .get(&format!("{}/tasks", &address))
         .send()
         .await
         .expect("Failed to execute request.");