diff --git a/tests/by-util/test_cksum.rs b/tests/by-util/test_cksum.rs
index 86de7ea95b6..1798261c3e3 100644
--- a/tests/by-util/test_cksum.rs
+++ b/tests/by-util/test_cksum.rs
@@ -1569,35 +1569,68 @@ fn test_check_mix_hex_base64() {
         .stdout_only("foo1.dat: OK\nfoo2.dat: OK\n");
 }
 
-#[ignore = "not yet implemented"]
+/// This test ensures that an improperly formatted base64 checksum in a file
+/// does not interrupt the processing of next lines.
 #[test]
-fn test_check_incorrectly_formatted_checksum_does_not_stop_processing() {
-    // The first line contains an incorrectly formatted checksum that can't be
-    // correctly decoded. This must not prevent the program from looking at the
-    // rest of the file.
-    let lines = [
-        "BLAKE2b-56 (foo1) = GFYEQ7HhAw=",    // Should be 2 '=' at the end
-        "BLAKE2b-56 (foo2) = 18560443b1e103", // OK
-    ];
+fn test_check_incorrectly_formatted_checksum_keeps_processing_b64() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+    at.touch("f");
+
+    let good_ck = "MD5 (f) = 1B2M2Y8AsgTpgAmY7PhCfg=="; // OK
+    let bad_ck = "MD5 (f) = 1B2M2Y8AsgTpgAmY7PhCfg="; // Missing last '='
+
+    // Good then Bad
+    scene
+        .ucmd()
+        .arg("--check")
+        .pipe_in([good_ck, bad_ck].join("\n").as_bytes().to_vec())
+        .succeeds()
+        .stdout_contains("f: OK")
+        .stderr_contains("cksum: WARNING: 1 line is improperly formatted");
+
+    // Bad then Good
+    scene
+        .ucmd()
+        .arg("--check")
+        .pipe_in([bad_ck, good_ck].join("\n").as_bytes().to_vec())
+        .succeeds()
+        .stdout_contains("f: OK")
+        .stderr_contains("cksum: WARNING: 1 line is improperly formatted");
+}
 
+/// This test ensures that an improperly formatted hexadecimal checksum in a
+/// file does not interrupt the processing of next lines.
+#[test]
+fn test_check_incorrectly_formatted_checksum_keeps_processing_hex() {
     let scene = TestScenario::new(util_name!());
     let at = &scene.fixtures;
+    at.touch("f");
+
+    let good_ck = "MD5 (f) = d41d8cd98f00b204e9800998ecf8427e"; // OK
+    let bad_ck = "MD5 (f) = d41d8cd98f00b204e9800998ecf8427"; // Missing last
 
-    at.write("foo1", "foo");
-    at.write("foo2", "foo");
-    at.write("sum", &lines.join("\n"));
+    // Good then Bad
+    scene
+        .ucmd()
+        .arg("--check")
+        .pipe_in([good_ck, bad_ck].join("\n").as_bytes().to_vec())
+        .succeeds()
+        .stdout_contains("f: OK")
+        .stderr_contains("cksum: WARNING: 1 line is improperly formatted");
 
+    // Bad then Good
     scene
         .ucmd()
         .arg("--check")
-        .arg(at.subdir.join("sum"))
+        .pipe_in([bad_ck, good_ck].join("\n").as_bytes().to_vec())
         .succeeds()
-        .stderr_contains("1 line is improperly formatted")
-        .stdout_contains("foo2: OK");
+        .stdout_contains("f: OK")
+        .stderr_contains("cksum: WARNING: 1 line is improperly formatted");
 }
 
 /// This module reimplements the cksum-base64.pl GNU test.
-mod cksum_base64 {
+mod gnu_cksum_base64 {
     use super::*;
     use crate::common::util::log_info;