diff --git a/.Rbuildignore b/.Rbuildignore
index e8fd69d..991cd61 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -9,5 +9,4 @@
 ^docs$
 ^pkgdown$
 ^\.github$
-.*\.xlsx$
-.*\.code-workspace$
+^codecov\.yml$
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
new file mode 100644
index 0000000..0ab748d
--- /dev/null
+++ b/.github/workflows/test-coverage.yaml
@@ -0,0 +1,62 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+name: test-coverage.yaml
+
+permissions: read-all
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::covr, any::xml2
+          needs: coverage
+
+      - name: Test coverage
+        run: |
+          cov <- covr::package_coverage(
+            quiet = FALSE,
+            clean = FALSE,
+            install_path = file.path(normalizePath(Sys.getenv("RUNNER_TEMP"), winslash = "/"), "package")
+          )
+          print(cov)
+          covr::to_cobertura(cov)
+        shell: Rscript {0}
+
+      - uses: codecov/codecov-action@v5
+        with:
+          # Fail if error if not on PR, or if on PR and token is given
+          fail_ci_if_error: ${{ github.event_name != 'pull_request' || secrets.CODECOV_TOKEN }}
+          files: ./cobertura.xml
+          plugins: noop
+          disable_search: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+      - name: Show testthat output
+        if: always()
+        run: |
+          ## --------------------------------------------------------------------
+          find '${{ runner.temp }}/package' -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+
+      - name: Upload test results
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-test-failures
+          path: ${{ runner.temp }}/package
diff --git a/DESCRIPTION b/DESCRIPTION
index 3a25cc4..ea9b519 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: SPCreporter
 Title: Creates Metric Reports using Statistical Process Control in the NHS style
-Version: 0.2.0.9004
+Version: 0.2.1
 Authors@R: c(
     person("Tom", "Smith",, "tomsmith_uk@hotmail.com", role = c("aut", "cre")),
     person("Fran", "Barton",, "fbarton@alwaysdata.net", role = "aut"))
diff --git a/R/helper_functions.R b/R/helper_functions.R
index cf44d85..80a6e08 100644
--- a/R/helper_functions.R
+++ b/R/helper_functions.R
@@ -236,9 +236,9 @@ align_rebase_dates <- function(input, measure_data) {
 #' @noRd
 get_assurance_type <- function(spc, improvement_direction) {
   imp_dir <- tolower(improvement_direction)
-  upl <- spc[["upl"]][1]
-  lpl <- spc[["lpl"]][1]
-  target <- spc[["target"]][1]
+  upl <- tail(spc[["upl"]], 1)
+  lpl <- tail(spc[["lpl"]], 1)
+  target <- tail(spc[["target"]], 1)
 
   a <- dplyr::case_when(
     imp_dir == "neutral" ~ "Neutral",
diff --git a/README.Rmd b/README.Rmd
index 80c80c5..b64c6aa 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -24,6 +24,10 @@ knitr::opts_chunk$set(
 
 # {SPCreporter}
 
+<!-- badges: start -->
+[![Codecov test coverage](https://codecov.io/gh/ThomUK/SPCreporter/graph/badge.svg)](https://app.codecov.io/gh/ThomUK/SPCreporter)
+<!-- badges: end -->
+
 {SPCreporter} is a simple way to add value to your performance reporting using statistical process control.  It produces reports similar to this [**example report**](report_examples/My_Example_Report.html).
 
 **Help sort signals from noise, and ensure your leadership are talking about signals that matter.**
diff --git a/README.md b/README.md
index db54b7b..8d69537 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,12 @@
 
 # {SPCreporter}
 
+<!-- badges: start -->
+
+[![Codecov test
+coverage](https://codecov.io/gh/ThomUK/SPCreporter/graph/badge.svg)](https://app.codecov.io/gh/ThomUK/SPCreporter)
+<!-- badges: end -->
+
 {SPCreporter} is a simple way to add value to your performance reporting
 using statistical process control. It produces reports similar to this
 [**example report**](report_examples/My_Example_Report.html).
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..04c5585
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,14 @@
+comment: false
+
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+    patch:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
diff --git a/tests/testthat/test-get_assurance_type.R b/tests/testthat/test-get_assurance_type.R
index 2b8548c..ee47658 100644
--- a/tests/testthat/test-get_assurance_type.R
+++ b/tests/testthat/test-get_assurance_type.R
@@ -103,3 +103,21 @@ test_that("it returns correct string in passing conditions", {
     "PASS_TARG"
   )
 })
+
+test_that("it uses the most recent row, not the first, for upl/lpl", {
+  # Simulates a real ptd_spc output where a single-point first rebase phase
+  # produces NA limits for that row, while the current (last) rows have valid
+  # limits. The target column is constant (as ptd_spc stores it) — only
+  # upl/lpl are NA early on.  get_assurance_type must use tail(), not [1],
+  # matching get_variation_type.
+  spc <- data.frame(
+    upl    = c(NA,  NA,  3),
+    lpl    = c(NA,  NA,  1),
+    target = c(0.5, 0.5, 0.5) # constant target; 0.5 < lpl → PASS for "increase"
+  )
+
+  expect_equal(
+    get_assurance_type(spc, "increase"),
+    "PASS_TARG"
+  )
+})