X-Git-Url: https://git.ladys.computer/Pisces/blobdiff_plain/70b032d26faece9d6573e6f0b2375f071bbcc866..e1cb83c479df2a3e4a5e918867a135ff9dde8121:/value.test.js

diff --git a/value.test.js b/value.test.js
index 7d6a5e1..b7dcd69 100644
--- a/value.test.js
+++ b/value.test.js
@@ -1,13 +1,17 @@
-// ♓🌟 Piscēs ∷ value.test.js
-// ====================================================================
-//
-// Copyright © 2022–2023 Lady [@ Lady’s Computer].
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this
-// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+// SPDX-FileCopyrightText: 2022, 2023, 2025 Lady <https://www.ladys.computer/about/#lady>
+// SPDX-License-Identifier: MPL-2.0
+/**
+ * ⁌ ♓🌟 Piscēs ∷ value.test.js
+ *
+ * Copyright © 2022–2023, 2025 Lady [@ Ladys Computer].
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+ */
 
 import {
+  assertEquals,
   assertStrictEquals,
   assertThrows,
   describe,
@@ -15,13 +19,18 @@ import {
 } from "./dev-deps.js";
 import {
   ASYNC_ITERATOR,
+  completePropertyDescriptor,
   HAS_INSTANCE,
   IS_CONCAT_SPREADABLE,
+  isAccessorDescriptor,
+  isDataDescriptor,
+  isFullyPopulatedDescriptor,
+  isGenericDescriptor,
   ITERATOR,
-  LN10,
-  LN2,
-  LOG10ℇ,
-  LOG2ℇ,
+  LN_10,
+  LN_2,
+  LOG10_𝑒,
+  LOG2_𝑒,
   MATCH,
   MATCH_ALL,
   MAXIMUM_NUMBER,
@@ -35,24 +44,26 @@ import {
   ordinaryToPrimitive,
   POSITIVE_INFINITY,
   POSITIVE_ZERO,
-  RECIPROCAL_SQRT2,
+  RECIPROCAL_SQRT_2,
   REPLACE,
   sameValue,
   sameValueZero,
   SPECIES,
   SPLIT,
-  SQRT2,
+  SQRT_2,
   TO_PRIMITIVE,
   TO_STRING_TAG,
+  toFunctionName,
   toIndex,
   toLength,
   toPrimitive,
+  toPropertyKey,
   type,
   UNDEFINED,
   UNSCOPABLES,
-  Ε,
-  Π,
-  ℇ,
+  𝑒,
+  𝜀,
+  𝜋,
 } from "./value.js";
 
 describe("ASYNC_ITERATOR", () => {
@@ -82,27 +93,27 @@ describe("ITERATOR", () => {
   });
 });
 
-describe("LN10", () => {
+describe("LN_10", () => {
   it("[[Get]] is ln(10)", () => {
-    assertStrictEquals(LN10, Math.LN10);
+    assertStrictEquals(LN_10, Math.LN10);
   });
 });
 
-describe("LN2", () => {
+describe("LN_2", () => {
   it("[[Get]] is ln(2)", () => {
-    assertStrictEquals(LN2, Math.LN2);
+    assertStrictEquals(LN_2, Math.LN2);
   });
 });
 
-describe("LOG10ℇ", () => {
-  it("[[Get]] is log10(ℇ)", () => {
-    assertStrictEquals(LOG10ℇ, Math.LOG10E);
+describe("LOG10_𝑒", () => {
+  it("[[Get]] is log10(𝑒)", () => {
+    assertStrictEquals(LOG10_𝑒, Math.LOG10E);
   });
 });
 
-describe("LOG2ℇ", () => {
+describe("LOG2_𝑒", () => {
   it("[[Get]] is log2(ℇ)", () => {
-    assertStrictEquals(LOG2ℇ, Math.LOG2E);
+    assertStrictEquals(LOG2_𝑒, Math.LOG2E);
   });
 });
 
@@ -184,9 +195,9 @@ describe("POSITIVE_ZERO", () => {
   });
 });
 
-describe("RECIPROCAL_SQRT2", () => {
+describe("RECIPROCAL_SQRT_2", () => {
   it("[[Get]] is sqrt(½)", () => {
-    assertStrictEquals(RECIPROCAL_SQRT2, Math.SQRT1_2);
+    assertStrictEquals(RECIPROCAL_SQRT_2, Math.SQRT1_2);
   });
 });
 
@@ -208,9 +219,9 @@ describe("SPLIT", () => {
   });
 });
 
-describe("SQRT2", () => {
+describe("SQRT_2", () => {
   it("[[Get]] is sqrt(2)", () => {
-    assertStrictEquals(SQRT2, Math.SQRT2);
+    assertStrictEquals(SQRT_2, Math.SQRT2);
   });
 });
 
@@ -238,21 +249,259 @@ describe("UNSCOPABLES", () => {
   });
 });
 
-describe("Ε", () => {
-  it("[[Get]] is ε", () => {
-    assertStrictEquals(Ε, Number.EPSILON);
+describe("completePropertyDescriptor", () => {
+  it("[[Call]] completes a generic descriptor", () => {
+    const desc = {};
+    completePropertyDescriptor(desc);
+    assertEquals(desc, {
+      configurable: false,
+      enumerable: false,
+      value: undefined,
+      writable: false,
+    });
+  });
+
+  it("[[Call]] completes a data descriptor", () => {
+    const desc = { value: undefined };
+    completePropertyDescriptor(desc);
+    assertEquals(desc, {
+      configurable: false,
+      enumerable: false,
+      value: undefined,
+      writable: false,
+    });
+  });
+
+  it("[[Call]] completes an accessor descriptor", () => {
+    const desc = { get: undefined };
+    completePropertyDescriptor(desc);
+    assertEquals(desc, {
+      configurable: false,
+      enumerable: false,
+      get: undefined,
+      set: undefined,
+    });
+  });
+
+  it("[[Call]] throws an error when the descriptor is undefined", () => {
+    assertThrows(() => new completePropertyDescriptor(undefined));
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new completePropertyDescriptor({}));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(completePropertyDescriptor.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(
+        completePropertyDescriptor.name,
+        "completePropertyDescriptor",
+      );
+    });
+  });
+});
+
+describe("isAccessorDescriptor", () => {
+  it("[[Call]] returns false for a generic descriptor", () => {
+    assertStrictEquals(isAccessorDescriptor({}), false);
+  });
+
+  it("[[Get]] returns false for a data descriptor", () => {
+    assertStrictEquals(
+      isAccessorDescriptor({ value: undefined }),
+      false,
+    );
+    assertStrictEquals(
+      isAccessorDescriptor({ writable: undefined }),
+      false,
+    );
+  });
+
+  it("[[Get]] returns true for an accessor descriptor", () => {
+    assertStrictEquals(isAccessorDescriptor({ get: undefined }), true);
+    assertStrictEquals(isAccessorDescriptor({ set: undefined }), true);
+  });
+
+  it("[[Get]] returns false for undefined", () => {
+    assertStrictEquals(isAccessorDescriptor(undefined), false);
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new isAccessorDescriptor({}));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(isAccessorDescriptor.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(
+        isAccessorDescriptor.name,
+        "isAccessorDescriptor",
+      );
+    });
+  });
+});
+
+describe("isDataDescriptor", () => {
+  it("[[Call]] returns false for a generic descriptor", () => {
+    assertStrictEquals(isDataDescriptor({}), false);
+  });
+
+  it("[[Get]] returns true for a data descriptor", () => {
+    assertStrictEquals(isDataDescriptor({ value: undefined }), true);
+    assertStrictEquals(isDataDescriptor({ writable: true }), true);
+  });
+
+  it("[[Get]] returns false for an accessor descriptor", () => {
+    assertStrictEquals(isDataDescriptor({ get: undefined }), false);
+    assertStrictEquals(isDataDescriptor({ set: undefined }), false);
+  });
+
+  it("[[Get]] returns false for undefined", () => {
+    assertStrictEquals(isDataDescriptor(undefined), false);
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new isDataDescriptor({}));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(isDataDescriptor.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(isDataDescriptor.name, "isDataDescriptor");
+    });
   });
 });
 
-describe("Π", () => {
-  it("[[Get]] is π", () => {
-    assertStrictEquals(Π, Math.PI);
+describe("isFullyPopulatedDescriptor", () => {
+  it("[[Call]] returns false for a generic descriptor", () => {
+    assertStrictEquals(isFullyPopulatedDescriptor({}), false);
+  });
+
+  it("[[Get]] returns false for a non‐fully‐populated data descriptor", () => {
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({ value: undefined }),
+      false,
+    );
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({ writable: true }),
+      false,
+    );
+  });
+
+  it("[[Get]] returns true for a fully‐populated data descriptor", () => {
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({
+        configurable: true,
+        enumerable: true,
+        value: undefined,
+        writable: true,
+      }),
+      true,
+    );
+  });
+
+  it("[[Get]] returns false for a non‐fully‐populated accessor descriptor", () => {
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({ get: undefined }),
+      false,
+    );
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({ set: undefined }),
+      false,
+    );
+  });
+
+  it("[[Get]] returns true for a fully‐populated accessor descriptor", () => {
+    assertStrictEquals(
+      isFullyPopulatedDescriptor({
+        configurable: true,
+        enumerable: true,
+        get: undefined,
+        set: undefined,
+      }),
+      true,
+    );
+  });
+
+  it("[[Get]] returns false for undefined", () => {
+    assertStrictEquals(isFullyPopulatedDescriptor(undefined), false);
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new isFullyPopulatedDescriptor({}));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(isFullyPopulatedDescriptor.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(
+        isFullyPopulatedDescriptor.name,
+        "isFullyPopulatedDescriptor",
+      );
+    });
   });
 });
 
-describe("ℇ", () => {
-  it("[[Get]] is ℇ", () => {
-    assertStrictEquals(ℇ, Math.E);
+describe("isGenericDescriptor", () => {
+  it("[[Call]] returns true for a generic descriptor", () => {
+    assertStrictEquals(isGenericDescriptor({}), true);
+  });
+
+  it("[[Get]] returns false for a data descriptor", () => {
+    assertStrictEquals(
+      isGenericDescriptor({ value: undefined }),
+      false,
+    );
+    assertStrictEquals(isGenericDescriptor({ writable: true }), false);
+  });
+
+  it("[[Get]] returns false for an accessor descriptor", () => {
+    assertStrictEquals(isGenericDescriptor({ get: undefined }), false);
+    assertStrictEquals(isGenericDescriptor({ set: undefined }), false);
+  });
+
+  it("[[Get]] returns false for undefined", () => {
+    assertStrictEquals(isGenericDescriptor(undefined), false);
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new isGenericDescriptor({}));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(isGenericDescriptor.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(
+        isGenericDescriptor.name,
+        "isGenericDescriptor",
+      );
+    });
   });
 });
 
@@ -469,6 +718,84 @@ describe("sameValueZero", () => {
   });
 });
 
+describe("toFunctionName", () => {
+  it("[[Call]] works with strings and no prefix", () => {
+    assertStrictEquals(toFunctionName("etaoin"), "etaoin");
+  });
+
+  it("[[Call]] works with objects and no prefix", () => {
+    assertStrictEquals(
+      toFunctionName({
+        toString() {
+          return "etaoin";
+        },
+      }),
+      "etaoin",
+    );
+  });
+
+  it("[[Call]] works with descriptionless symbols and no prefix", () => {
+    assertStrictEquals(toFunctionName(Symbol()), "");
+  });
+
+  it("[[Call]] works with empty description symbols and no prefix", () => {
+    assertStrictEquals(toFunctionName(Symbol("")), "[]");
+  });
+
+  it("[[Call]] works with described symbols and no prefix", () => {
+    assertStrictEquals(toFunctionName(Symbol("etaoin")), "[etaoin]");
+  });
+
+  it("[[Call]] works with strings and a prefix", () => {
+    assertStrictEquals(toFunctionName("etaoin", "foo"), "foo etaoin");
+  });
+
+  it("[[Call]] works with objects and no prefix", () => {
+    assertStrictEquals(
+      toFunctionName({
+        toString() {
+          return "etaoin";
+        },
+      }, "foo"),
+      "foo etaoin",
+    );
+  });
+
+  it("[[Call]] works with descriptionless symbols and no prefix", () => {
+    assertStrictEquals(toFunctionName(Symbol(), "foo"), "foo ");
+  });
+
+  it("[[Call]] works with empty description symbols and no prefix", () => {
+    assertStrictEquals(toFunctionName(Symbol(""), "foo"), "foo []");
+  });
+
+  it("[[Call]] works with described symbols and no prefix", () => {
+    assertStrictEquals(
+      toFunctionName(Symbol("etaoin"), "foo"),
+      "foo [etaoin]",
+    );
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new toFunctionName(""));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(toFunctionName.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(
+        toFunctionName.name,
+        "toFunctionName",
+      );
+    });
+  });
+});
+
 describe("toIndex", () => {
   it("[[Call]] returns an index", () => {
     assertStrictEquals(toIndex(9007199254740991), 9007199254740991);
@@ -668,6 +995,47 @@ describe("toPrimitive", () => {
   });
 });
 
+describe("toPropertyKey", () => {
+  it("returns a string or symbol", () => {
+    const sym = Symbol();
+    assertStrictEquals(toPropertyKey(sym), sym);
+    assertStrictEquals(
+      toPropertyKey(new String("success")),
+      "success",
+    );
+  });
+
+  it("favours the `toString` representation", () => {
+    assertStrictEquals(
+      toPropertyKey({
+        toString() {
+          return "success";
+        },
+        valueOf() {
+          return "failure";
+        },
+      }),
+      "success",
+    );
+  });
+
+  it("[[Construct]] throws an error", () => {
+    assertThrows(() => new toPropertyKey(""));
+  });
+
+  describe(".length", () => {
+    it("[[Get]] returns the correct length", () => {
+      assertStrictEquals(toPropertyKey.length, 1);
+    });
+  });
+
+  describe(".name", () => {
+    it("[[Get]] returns the correct name", () => {
+      assertStrictEquals(toPropertyKey.name, "toPropertyKey");
+    });
+  });
+});
+
 describe("type", () => {
   it('[[Call]] returns "null" for null', () => {
     assertStrictEquals(type(null), "null");
@@ -705,3 +1073,21 @@ describe("type", () => {
     });
   });
 });
+
+describe("𝑒", () => {
+  it("[[Get]] is 𝑒", () => {
+    assertStrictEquals(𝑒, Math.E);
+  });
+});
+
+describe("𝜀", () => {
+  it("[[Get]] is 𝜀", () => {
+    assertStrictEquals(𝜀, Number.EPSILON);
+  });
+});
+
+describe("𝜋", () => {
+  it("[[Get]] is 𝜋", () => {
+    assertStrictEquals(𝜋, Math.PI);
+  });
+});