4 files changed, 85 insertions, 0 deletions
diff --git a/cli/tests/coverage_tests.rs b/cli/tests/coverage_tests.rs
index 1806417ea..6515fd6ec 100644
--- a/cli/tests/coverage_tests.rs
+++ b/cli/tests/coverage_tests.rs
@@ -26,6 +26,68 @@ mod coverage {
     no_snaps_included("no_snaps_included", "ts");
   }
 
+  #[test]
+  fn error_if_invalid_cache() {
+    let deno_dir = TempDir::new();
+    let deno_dir_path = deno_dir.path();
+    let tempdir = TempDir::new();
+    let tempdir = tempdir.path().join("cov");
+
+    let invalid_cache_path =
+      util::testdata_path().join("coverage/invalid_cache");
+    let mod_before_path = util::testdata_path()
+      .join(&invalid_cache_path)
+      .join("mod_before.ts");
+    let mod_after_path = util::testdata_path()
+      .join(&invalid_cache_path)
+      .join("mod_after.ts");
+    let mod_test_path = util::testdata_path()
+      .join(&invalid_cache_path)
+      .join("mod.test.ts");
+
+    let mod_temp_path = deno_dir_path.join("mod.ts");
+    let mod_test_temp_path = deno_dir_path.join("mod.test.ts");
+
+    // Write the inital mod.ts file
+    std::fs::copy(mod_before_path, &mod_temp_path).unwrap();
+    // And the test file
+    std::fs::copy(mod_test_path, &mod_test_temp_path).unwrap();
+
+    // Generate coverage
+    let status = util::deno_cmd_with_deno_dir(&deno_dir)
+      .current_dir(deno_dir_path)
+      .arg("test")
+      .arg("--quiet")
+      .arg(format!("--coverage={}", tempdir.to_str().unwrap()))
+      .stdout(std::process::Stdio::piped())
+      .stderr(std::process::Stdio::inherit())
+      .status()
+      .unwrap();
+
+    assert!(status.success());
+
+    // Modify the file between deno test and deno coverage, thus invalidating the cache
+    std::fs::copy(mod_after_path, mod_temp_path).unwrap();
+
+    let output = util::deno_cmd_with_deno_dir(&deno_dir)
+      .current_dir(deno_dir_path)
+      .arg("coverage")
+      .arg(format!("{}/", tempdir.to_str().unwrap()))
+      .stdout(std::process::Stdio::piped())
+      .stderr(std::process::Stdio::piped())
+      .output()
+      .unwrap();
+
+    assert!(output.stdout.is_empty());
+
+    // Expect error
+    let error =
+      util::strip_ansi_codes(std::str::from_utf8(&output.stderr).unwrap())
+        .to_string();
+    assert!(error.contains("error: Missing transpiled source code"));
+    assert!(error.contains("Before generating coverage report, run `deno test --coverage` to ensure consistent state."));
+  }
+
   fn run_coverage_text(test_name: &str, extension: &str) {
     let deno_dir = TempDir::new();
     let tempdir = TempDir::new();
diff --git a/cli/tests/testdata/coverage/invalid_cache/mod.test.ts b/cli/tests/testdata/coverage/invalid_cache/mod.test.ts
new file mode 100644
index 000000000..5815d07a3
--- /dev/null
+++ b/cli/tests/testdata/coverage/invalid_cache/mod.test.ts
@@ -0,0 +1,2 @@
+import { test } from "./mod.ts";
+Deno.test("test", () => void test());
diff --git a/cli/tests/testdata/coverage/invalid_cache/mod_after.ts b/cli/tests/testdata/coverage/invalid_cache/mod_after.ts
new file mode 100644
index 000000000..294dc0843
--- /dev/null
+++ b/cli/tests/testdata/coverage/invalid_cache/mod_after.ts
@@ -0,0 +1,6 @@
+export function test() {
+  return 42;
+}
+if (import.meta.main) {
+  test();
+}
diff --git a/cli/tests/testdata/coverage/invalid_cache/mod_before.ts b/cli/tests/testdata/coverage/invalid_cache/mod_before.ts
new file mode 100644
index 000000000..ea52ccbce
--- /dev/null
+++ b/cli/tests/testdata/coverage/invalid_cache/mod_before.ts
@@ -0,0 +1,15 @@
+export function test() {
+  console.log("1");
+  console.log("2");
+  console.log("3");
+  console.log("4");
+  console.log("5");
+  console.log("6");
+  console.log("7");
+  console.log("8");
+  console.log("9");
+  return 42;
+}
+if (import.meta.main) {
+  test();
+}