diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 31000a274..b8a7f7d79 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -20,3 +20,14 @@ jobs:
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+    - name: Install cargo-llvm-cov
+      run: cargo install cargo-llvm-cov
+    - name: Generate code coverage
+      run: cargo llvm-cov --all-features --workspace --codecov --output-path codecov.json
+    - name: Upload coverage to Codecov
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: codecov.json
+        fail_ci_if_error: true
+      uses: codecov/codecov-action@v3
+
diff --git a/Cargo.toml b/Cargo.toml
index 1a8b61451..2efa88a4c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,3 +18,6 @@ rust-version = "1.71.1"
 [dev-dependencies]
 paste = "1.0.14"
 
+[badges]
+codecov = { repository = "nordzilla/count-digits", branch = "main", service = "github" }
+
diff --git a/README.md b/README.md
index 30abee654..34464271b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![Coverage Status](https://codecov.io/gh/nordzilla/count-digits/branch/main/graph/badge.svg)](https://codecov.io/gh/nordzilla/count-digits)
+
 # count-digits
 
 ## CountDigits
diff --git a/src/lib.rs b/src/lib.rs
index eee9f769f..95c5ef8cc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1040,6 +1040,7 @@ mod count_digits {
                 fn [<min_to_max_or_one_million_ $non_zero_type>]() {
                     let max = if ($type::MAX as u128) < 1_000_000 { $type::MAX } else { 1_000_000 };
                     for n in $non_zero_type::MIN.get()..=max {
+                        let n = $non_zero_type::new(n).unwrap();
                         assert_representations!(n);
                     }
                 }