diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures.js
index 23fb280182a0..c39e4d211cbd 100644
--- a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures.js
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures.js
@@ -31,7 +31,11 @@ function run_test(algorithmNames) {
         {name: "RSA-PSS",  resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
         {name: "RSA-OAEP", resultType: "CryptoKeyPair", usages: ["encrypt", "decrypt", "wrapKey", "unwrapKey"], mandatoryUsages: ["decrypt", "unwrapKey"]},
         {name: "ECDSA",    resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
-        {name: "ECDH",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]}
+        {name: "ECDH",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
+        {name: "Ed25519",  resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
+        {name: "Ed448",    resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
+        {name: "X25519",   resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
+        {name: "X448",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
     ];
 
     var testVectors = [];
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed25519.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed25519.https.any.js
new file mode 100644
index 000000000000..8f18fb1efe09
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed25519.https.any.js
@@ -0,0 +1,5 @@
+// META: title=WebCryptoAPI: generateKey() for Failures
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=failures.js
+run_test(["Ed25519"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed448.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed448.https.any.js
new file mode 100644
index 000000000000..b25dcd149094
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_Ed448.https.any.js
@@ -0,0 +1,5 @@
+// META: title=WebCryptoAPI: generateKey() for Failures
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=failures.js
+run_test(["Ed448"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X25519.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X25519.https.any.js
new file mode 100644
index 000000000000..2662d8697a9a
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X25519.https.any.js
@@ -0,0 +1,5 @@
+// META: title=WebCryptoAPI: generateKey() for Failures
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=failures.js
+run_test(["X25519"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X448.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X448.https.any.js
new file mode 100644
index 000000000000..455e260d1fe9
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/failures_X448.https.any.js
@@ -0,0 +1,5 @@
+// META: title=WebCryptoAPI: generateKey() for Failures
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=failures.js
+run_test(["X448"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes.js
index b99e44d66d40..4a047aa0609d 100644
--- a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes.js
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes.js
@@ -26,7 +26,11 @@ function run_test(algorithmNames, slowTest) {
         {name: "RSA-PSS",  resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
         {name: "RSA-OAEP", resultType: "CryptoKeyPair", usages: ["encrypt", "decrypt", "wrapKey", "unwrapKey"], mandatoryUsages: ["decrypt", "unwrapKey"]},
         {name: "ECDSA",    resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
-        {name: "ECDH",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]}
+        {name: "ECDH",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
+        {name: "Ed25519",  resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
+        {name: "Ed448",    resultType: "CryptoKeyPair", usages: ["sign", "verify"], mandatoryUsages: ["sign"]},
+        {name: "X25519",   resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
+        {name: "X448",     resultType: "CryptoKeyPair", usages: ["deriveKey", "deriveBits"], mandatoryUsages: ["deriveKey", "deriveBits"]},
     ];
 
     var testVectors = [];
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed25519.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed25519.https.any.js
new file mode 100644
index 000000000000..6b3bc460f60f
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed25519.https.any.js
@@ -0,0 +1,6 @@
+// META: title=WebCryptoAPI: generateKey() Successful Calls
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=/common/subset-tests.js
+// META: script=successes.js
+run_test(["Ed25519"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed448.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed448.https.any.js
new file mode 100644
index 000000000000..8e37f57b244b
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_Ed448.https.any.js
@@ -0,0 +1,6 @@
+// META: title=WebCryptoAPI: generateKey() Successful Calls
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=/common/subset-tests.js
+// META: script=successes.js
+run_test(["Ed448"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X25519.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X25519.https.any.js
new file mode 100644
index 000000000000..0e87cf50108e
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X25519.https.any.js
@@ -0,0 +1,6 @@
+// META: title=WebCryptoAPI: generateKey() Successful Calls
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=/common/subset-tests.js
+// META: script=successes.js
+run_test(["X25519"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X448.https.any.js b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X448.https.any.js
new file mode 100644
index 000000000000..e7dbe32696d8
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/generateKey/successes_X448.https.any.js
@@ -0,0 +1,6 @@
+// META: title=WebCryptoAPI: generateKey() Successful Calls
+// META: timeout=long
+// META: script=../util/helpers.js
+// META: script=/common/subset-tests.js
+// META: script=successes.js
+run_test(["X448"]);
diff --git a/testing/web-platform/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js b/testing/web-platform/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js
new file mode 100644
index 000000000000..836d6eaa3057
--- /dev/null
+++ b/testing/web-platform/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js
@@ -0,0 +1,282 @@
+// META: title=WebCryptoAPI: importKey() for OKP keys
+// META: timeout=long
+
+// Test importKey and exportKey for OKP algorithms. Only "happy paths" are
+// currently tested - those where the operation should succeed.
+
+    var subtle = crypto.subtle;
+
+    var keyData = {
+        "Ed25519": {
+            spki: new Uint8Array([48, 42, 48, 5, 6, 3, 43, 101, 112, 3, 33, 0, 216, 225, 137, 99, 216, 9, 212, 135, 217, 84, 154, 204, 174, 198, 116, 46, 126, 235, 162, 77, 138, 13, 59, 20, 183, 227, 202, 234, 6, 137, 61, 204]),
+            pkcs8: new Uint8Array([48, 46, 2, 1, 0, 48, 5, 6, 3, 43, 101, 112, 4, 34, 4, 32, 243, 200, 244, 196, 141, 248, 120, 20, 110, 140, 211, 191, 109, 244, 229, 14, 56, 155, 167, 7, 78, 21, 194, 53, 45, 205, 93, 48, 141, 76, 168, 31]),
+            jwk: {
+                crv: "Ed25519",
+                d: "88j0xI34eBRujNO_bfTlDjibpwdOFcI1Lc1dMI1MqB8",
+                x: "2OGJY9gJ1IfZVJrMrsZ0Ln7rok2KDTsUt-PK6gaJPcw",
+                kty: "OKP"
+            }
+        },
+
+        "Ed448": {
+            spki: new Uint8Array([48, 67, 48, 5, 6, 3, 43, 101, 113, 3, 58, 0, 171, 75, 184, 133, 253, 125, 44, 90, 242, 78, 131, 113, 12, 255, 160, 199, 74, 87, 226, 116, 128, 29, 178, 5, 123, 11, 220, 94, 160, 50, 182, 254, 107, 199, 139, 128, 69, 54, 90, 235, 38, 232, 110, 31, 20, 253, 52, 157, 7, 196, 132, 149, 245, 164, 106, 90, 128]),
+            pkcs8: new Uint8Array([48, 71, 2, 1, 0, 48, 5, 6, 3, 43, 101, 113, 4, 59, 4, 57, 14, 255, 3, 69, 140, 40, 224, 23, 156, 82, 29, 227, 18, 201, 105, 183, 131, 67, 72, 236, 171, 153, 26, 96, 227, 178, 233, 167, 158, 76, 217, 228, 128, 239, 41, 23, 18, 210, 200, 61, 4, 114, 114, 213, 201, 244, 40, 102, 79, 105, 109, 38, 112, 69, 143, 29, 46]),
+            jwk: {
+                crv: "Ed448",
+                d: "Dv8DRYwo4BecUh3jEslpt4NDSOyrmRpg47Lpp55M2eSA7ykXEtLIPQRyctXJ9ChmT2ltJnBFjx0u",
+                x: "q0u4hf19LFryToNxDP-gx0pX4nSAHbIFewvcXqAytv5rx4uARTZa6ybobh8U_TSdB8SElfWkalqA",
+                kty: "OKP"
+            }
+        },
+
+        "X25519": {
+            spki: new Uint8Array([48, 42, 48, 5, 6, 3, 43, 101, 110, 3, 33, 0, 28, 242, 177, 230, 2, 46, 197, 55, 55, 30, 215, 245, 62, 84, 250, 17, 84, 216, 62, 152, 235, 100, 234, 81, 250, 229, 179, 48, 124, 254, 151, 6]),
+            pkcs8: new Uint8Array([48, 46, 2, 1, 0, 48, 5, 6, 3, 43, 101, 110, 4, 34, 4, 32, 200, 131, 142, 118, 208, 87, 223, 183, 216, 201, 90, 105, 225, 56, 22, 10, 221, 99, 115, 253, 113, 164, 210, 118, 187, 86, 227, 168, 27, 100, 255, 97]),
+            jwk: {
+                crv: "X25519",
+                d: "yIOOdtBX37fYyVpp4TgWCt1jc_1xpNJ2u1bjqBtk_2E",
+                x: "HPKx5gIuxTc3Htf1PlT6EVTYPpjrZOpR-uWzMHz-lwY",
+                kty: "OKP"
+            }
+        },
+
+        "X448": {
+            spki: new Uint8Array([48, 66, 48, 5, 6, 3, 43, 101, 111, 3, 57, 0, 182, 4, 161, 209, 165, 205, 29, 148, 38, 213, 97, 239, 99, 10, 158, 177, 108, 190, 105, 213, 185, 202, 97, 94, 220, 83, 99, 62, 251, 82, 234, 49, 230, 230, 160, 161, 219, 172, 198, 231, 108, 188, 230, 72, 45, 126, 75, 163, 213, 93, 158, 128, 39, 101, 206, 111]),
+            pkcs8: new Uint8Array([48, 70, 2, 1, 0, 48, 5, 6, 3, 43, 101, 111, 4, 58, 4, 56, 88, 199, 210, 154, 62, 181, 25, 178, 157, 0, 207, 177, 145, 187, 100, 252, 109, 138, 66, 216, 241, 113, 118, 39, 43, 137, 242, 39, 45, 24, 25, 41, 92, 101, 37, 192, 130, 150, 113, 176, 82, 239, 7, 39, 83, 15, 24, 142, 49, 208, 204, 83, 191, 38, 146, 158]),
+            jwk: {
+                crv: "X448",
+                d: "WMfSmj61GbKdAM-xkbtk_G2KQtjxcXYnK4nyJy0YGSlcZSXAgpZxsFLvBydTDxiOMdDMU78mkp4",
+                x: "tgSh0aXNHZQm1WHvYwqesWy-adW5ymFe3FNjPvtS6jHm5qCh26zG52y85kgtfkuj1V2egCdlzm8",
+                kty: "OKP"
+            }
+        },
+
+    };
+
+    // combinations to test
+    var testVectors = [
+        {name: "Ed25519", privateUsages: ["sign"], publicUsages: ["verify"]},
+        {name: "Ed448", privateUsages: ["sign"], publicUsages: ["verify"]},
+        {name: "X25519",  privateUsages: ["deriveKey", "deriveBits"], publicUsages: []},
+        {name: "X448",  privateUsages: ["deriveKey", "deriveBits"], publicUsages: []},
+    ];
+
+    // TESTS ARE HERE:
+    // Test every test vector, along with all available key data
+    testVectors.forEach(function(vector) {
+        [true, false].forEach(function(extractable) {
+
+            // Test public keys first
+            [[]].forEach(function(usages) { // Only valid usages argument is empty array
+                ['spki', 'jwk'].forEach(function(format) {
+                    var algorithm = {name: vector.name};
+                    var data = keyData[vector.name];
+                    if (format === "jwk") { // Not all fields used for public keys
+                        data = {jwk: {kty: keyData[vector.name].jwk.kty, crv: keyData[vector.name].jwk.crv, x: keyData[vector.name].jwk.x}};
+                    }
+
+                    testFormat(format, algorithm, data, vector.name, usages, extractable);
+                });
+
+            });
+
+            // Next, test private keys
+            allValidUsages(vector.privateUsages, []).forEach(function(usages) {
+                ['pkcs8', 'jwk'].forEach(function(format) {
+                    var algorithm = {name: vector.name};
+                    var data = keyData[vector.name];
+
+                    testFormat(format, algorithm, data, vector.name, usages, extractable);
+                });
+            });
+        });
+    });
+
+
+    // Test importKey with a given key format and other parameters. If
+    // extrable is true, export the key and verify that it matches the input.
+    function testFormat(format, algorithm, keyData, keySize, usages, extractable) {
+        promise_test(function(test) {
+            return subtle.importKey(format, keyData[format], algorithm, extractable, usages).
+            then(function(key) {
+                assert_equals(key.constructor, CryptoKey, "Imported a CryptoKey object");
+                if (!extractable) {
+                    return;
+                }
+
+                return subtle.exportKey(format, key).
+                then(function(result) {
+                    if (format !== "jwk") {
+                        assert_true(equalBuffers(keyData[format], result), "Round trip works");
+                    } else {
+                        assert_true(equalJwk(keyData[format], result), "Round trip works");
+                    }
+                }, function(err) {
+                    assert_unreached("Threw an unexpected error: " + err.toString());
+                });
+            }, function(err) {
+                assert_unreached("Threw an unexpected error: " + err.toString());
+            });
+        }, "Good parameters: " + keySize.toString() + " bits " + parameterString(format, keyData[format], algorithm, extractable, usages));
+    }
+
+
+
+    // Helper methods follow:
+
+    // Are two array buffers the same?
+    function equalBuffers(a, b) {
+        if (a.byteLength !== b.byteLength) {
+            return false;
+        }
+
+        var aBytes = new Uint8Array(a);
+        var bBytes = new Uint8Array(b);
+
+        for (var i=0; i<a.byteLength; i++) {
+            if (aBytes[i] !== bBytes[i]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    // Are two Jwk objects "the same"? That is, does the object returned include
+    // matching values for each property that was expected? It's okay if the
+    // returned object has extra methods; they aren't checked.
+    function equalJwk(expected, got) {
+        var fields = Object.keys(expected);
+        var fieldName;
+
+        for(var i=0; i<fields.length; i++) {
+            fieldName = fields[i];
+            if (!(fieldName in got)) {
+                return false;
+            }
+            if (expected[fieldName] !== got[fieldName]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    // Build minimal Jwk objects from raw key data and algorithm specifications
+    function jwkData(keyData, algorithm) {
+        var result = {
+            kty: "oct",
+            k: byteArrayToUnpaddedBase64(keyData)
+        };
+
+        if (algorithm.name.substring(0, 3) === "AES") {
+            result.alg = "A" + (8 * keyData.byteLength).toString() + algorithm.name.substring(4);
+        } else if (algorithm.name === "HMAC") {
+            result.alg = "HS" + algorithm.hash.substring(4);
+        }
+        return result;
+    }
+
+    // Jwk format wants Base 64 without the typical padding at the end.
+    function byteArrayToUnpaddedBase64(byteArray){
+        var binaryString = "";
+        for (var i=0; i<byteArray.byteLength; i++){
+            binaryString += String.fromCharCode(byteArray[i]);
+        }
+        var base64String = btoa(binaryString);
+
+        return base64String.replace(/=/g, "");
+    }
+
+    // Want to test every valid combination of usages. Start by creating a list
+    // of all non-empty subsets to possible usages.
+    function allNonemptySubsetsOf(arr) {
+        var results = [];
+        var firstElement;
+        var remainingElements;
+
+        for(var i=0; i<arr.length; i++) {
+            firstElement = arr[i];
+            remainingElements = arr.slice(i+1);
+            results.push([firstElement]);
+
+            if (remainingElements.length > 0) {
+                allNonemptySubsetsOf(remainingElements).forEach(function(combination) {
+                    combination.push(firstElement);
+                    results.push(combination);
+                });
+            }
+        }
+
+        return results;
+    }
+
+    // Return a list of all valid usage combinations, given the possible ones
+    // and the ones that are required for a particular operation.
+    function allValidUsages(possibleUsages, requiredUsages) {
+        var allUsages = [];
+
+        allNonemptySubsetsOf(possibleUsages).forEach(function(usage) {
+            for (var i=0; i<requiredUsages.length; i++) {
+                if (!usage.includes(requiredUsages[i])) {
+                    return;
+                }
+            }
+            allUsages.push(usage);
+        });
+
+        return allUsages;
+    }
+
+    // Convert method parameters to a string to uniquely name each test
+    function parameterString(format, data, algorithm, extractable, usages) {
+        if ("byteLength" in data) {
+            data = "buffer(" + data.byteLength.toString() + ")";
+        } else {
+            data = "object(" + Object.keys(data).join(", ") + ")";
+        }
+        var result = "(" +
+                        objectToString(format) + ", " +
+                        objectToString(data) + ", " +
+                        objectToString(algorithm) + ", " +
+                        objectToString(extractable) + ", " +
+                        objectToString(usages) +
+                     ")";
+
+        return result;
+    }
+
+    // Character representation of any object we may use as a parameter.
+    function objectToString(obj) {
+        var keyValuePairs = [];
+
+        if (Array.isArray(obj)) {
+            return "[" + obj.map(function(elem){return objectToString(elem);}).join(", ") + "]";
+        } else if (typeof obj === "object") {
+            Object.keys(obj).sort().forEach(function(keyName) {
+                keyValuePairs.push(keyName + ": " + objectToString(obj[keyName]));
+            });
+            return "{" + keyValuePairs.join(", ") + "}";
+        } else if (typeof obj === "undefined") {
+            return "undefined";
+        } else {
+            return obj.toString();
+        }
+
+        var keyValuePairs = [];
+
+        Object.keys(obj).sort().forEach(function(keyName) {
+            var value = obj[keyName];
+            if (typeof value === "object") {
+                value = objectToString(value);
+            } else if (typeof value === "array") {
+                value = "[" + value.map(function(elem){return objectToString(elem);}).join(", ") + "]";
+            } else {
+                value = value.toString();
+            }
+
+            keyValuePairs.push(keyName + ": " + value);
+        });
+
+        return "{" + keyValuePairs.join(", ") + "}";
+    }
diff --git a/testing/web-platform/tests/WebCryptoAPI/tools/generate.py b/testing/web-platform/tests/WebCryptoAPI/tools/generate.py
index 728f914bdb27..35ba0f003155 100644
--- a/testing/web-platform/tests/WebCryptoAPI/tools/generate.py
+++ b/testing/web-platform/tests/WebCryptoAPI/tools/generate.py
@@ -64,7 +64,8 @@ run_test([%s]);
 done();"""
 
 names = ["AES-CTR", "AES-CBC", "AES-GCM", "AES-KW", "HMAC", "RSASSA-PKCS1-v1_5",
-         "RSA-PSS", "RSA-OAEP", "ECDSA", "ECDH"]
+         "RSA-PSS", "RSA-OAEP", "ECDSA", "ECDH", "Ed25519", "Ed448", "X25519",
+         "X448"]
 
 for filename_pattern, template in [("test_successes_%s.https.html", successes_html),
                                    ("test_failures_%s.https.html", failures_html),
diff --git a/testing/web-platform/tests/WebCryptoAPI/util/helpers.js b/testing/web-platform/tests/WebCryptoAPI/util/helpers.js
index fecd8733c0b2..b6aa6ed0c10c 100644
--- a/testing/web-platform/tests/WebCryptoAPI/util/helpers.js
+++ b/testing/web-platform/tests/WebCryptoAPI/util/helpers.js
@@ -20,7 +20,11 @@ var registeredAlgorithmNames = [
     "SHA-384",
     "SHA-512",
     "HKDF-CTR",
-    "PBKDF2"
+    "PBKDF2",
+    "Ed25519",
+    "Ed448",
+    "X25519",
+    "X448"
 ];
 
 
@@ -177,6 +181,8 @@ function allAlgorithmSpecifiersFor(algorithmName) {
         curves.forEach(function(curveName) {
             results.push({name: algorithmName, namedCurve: curveName});
         });
+    } else if (algorithmName.toUpperCase().substring(0, 1) === "X" || algorithmName.toUpperCase().substring(0, 2) === "ED") {
+        results.push({ name: algorithmName });
     }
 
     return results;
@@ -216,6 +222,9 @@ function allValidUsages(validUsages, emptyIsValid, mandatoryUsages) {
     return okaySubsets;
 }
 
+function unique(names) {
+    return [...new Set(names)];
+}
 
 // Algorithm name specifiers are case-insensitive. Generate several
 // case variations of a given name.
@@ -227,5 +236,5 @@ function allNameVariants(name, slowTest) {
     // for slow tests effectively cut the amount of work in third by only
     // returning one variation
     if (slowTest) return [mixedCaseName];
-    return [upCaseName, lowCaseName, mixedCaseName];
+    return unique([upCaseName, lowCaseName, mixedCaseName]);
 }