diff --git a/tests/ef_tests/src/cases.rs b/tests/ef_tests/src/cases.rs
index 4fa082ec9..9b15248f5 100644
--- a/tests/ef_tests/src/cases.rs
+++ b/tests/ef_tests/src/cases.rs
@@ -7,6 +7,7 @@ mod bls_g2_compressed;
 mod bls_g2_uncompressed;
 mod bls_priv_to_pub;
 mod bls_sign_msg;
+mod operations_attester_slashing;
 mod operations_deposit;
 mod operations_exit;
 mod operations_proposer_slashing;
@@ -21,6 +22,7 @@ pub use bls_g2_compressed::*;
 pub use bls_g2_uncompressed::*;
 pub use bls_priv_to_pub::*;
 pub use bls_sign_msg::*;
+pub use operations_attester_slashing::*;
 pub use operations_deposit::*;
 pub use operations_exit::*;
 pub use operations_proposer_slashing::*;
diff --git a/tests/ef_tests/src/cases/operations_attester_slashing.rs b/tests/ef_tests/src/cases/operations_attester_slashing.rs
new file mode 100644
index 000000000..d8f1f06dc
--- /dev/null
+++ b/tests/ef_tests/src/cases/operations_attester_slashing.rs
@@ -0,0 +1,42 @@
+use super::*;
+use crate::case_result::compare_beacon_state_results_without_caches;
+use serde_derive::Deserialize;
+use state_processing::per_block_processing::process_attester_slashings;
+use types::{AttesterSlashing, BeaconState, EthSpec};
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct OperationsAttesterSlashing<E: EthSpec> {
+    pub description: String,
+    #[serde(bound = "E: EthSpec")]
+    pub pre: BeaconState<E>,
+    pub attester_slashing: AttesterSlashing,
+    #[serde(bound = "E: EthSpec")]
+    pub post: Option<BeaconState<E>>,
+}
+
+impl<E: EthSpec> YamlDecode for OperationsAttesterSlashing<E> {
+    fn yaml_decode(yaml: &String) -> Result<Self, Error> {
+        Ok(serde_yaml::from_str(&yaml.as_str()).unwrap())
+    }
+}
+
+impl<E: EthSpec> Case for OperationsAttesterSlashing<E> {
+    fn description(&self) -> String {
+        self.description.clone()
+    }
+
+    fn result(&self, _case_index: usize) -> Result<(), Error> {
+        let mut state = self.pre.clone();
+        let attester_slashing = self.attester_slashing.clone();
+        let mut expected = self.post.clone();
+
+        // Processing requires the epoch cache.
+        state.build_all_caches(&E::spec()).unwrap();
+
+        let result = process_attester_slashings(&mut state, &[attester_slashing], &E::spec());
+
+        let mut result = result.and_then(|_| Ok(state));
+
+        compare_beacon_state_results_without_caches(&mut result, &mut expected)
+    }
+}
diff --git a/tests/ef_tests/src/doc.rs b/tests/ef_tests/src/doc.rs
index 3947d81bf..5a9df0c21 100644
--- a/tests/ef_tests/src/doc.rs
+++ b/tests/ef_tests/src/doc.rs
@@ -77,6 +77,12 @@ impl Doc {
             ("operations", "proposer_slashing", "minimal") => {
                 run_test::<OperationsProposerSlashing<MinimalEthSpec>>(self)
             }
+            ("operations", "attester_slashing", "mainnet") => {
+                run_test::<OperationsAttesterSlashing<MainnetEthSpec>>(self)
+            }
+            ("operations", "attester_slashing", "minimal") => {
+                run_test::<OperationsAttesterSlashing<MinimalEthSpec>>(self)
+            }
             (runner, handler, config) => panic!(
                 "No implementation for runner: \"{}\", handler: \"{}\", config: \"{}\"",
                 runner, handler, config
diff --git a/tests/ef_tests/tests/tests.rs b/tests/ef_tests/tests/tests.rs
index 1cb12321b..15b98e804 100644
--- a/tests/ef_tests/tests/tests.rs
+++ b/tests/ef_tests/tests/tests.rs
@@ -110,6 +110,16 @@ fn operations_proposer_slashing() {
         });
 }
 
+#[test]
+#[cfg(not(feature = "fake_crypto"))]
+fn operations_attester_slashing() {
+    yaml_files_in_test_dir(&Path::new("operations").join("attester_slashing"))
+        .into_par_iter()
+        .for_each(|file| {
+            Doc::assert_tests_pass(file);
+        });
+}
+
 #[test]
 #[cfg(not(feature = "fake_crypto"))]
 fn bls() {