add test spec for HashSet

Signed-off-by: Eric Vergnaud <[email protected]>

runtime/JavaScript/spec/HashSetSpec.js

@@ -0,0 +1,52 @@
+import HashSet from "../src/antlr4/misc/HashSet.js";
+import HashCode from "../src/antlr4/misc/HashCode.js";
+
+class Thing {
+
+    value1 = Math.random();
+    value2 = Math.random();
+
+    hashCode() {
+        return HashCode.hashStuff(this.value1);
+    }
+
+    equals(other) {
+        return other instanceof Thing
+            && other.value1 === this.value1
+            && other.value2 === this.value2;
+    }
+}
+describe('test HashSet', () => {
+
+    it("adds a thing", () => {
+        const t1 = new Thing();
+        const t2 = new Thing();
+        const set = new HashSet();
+        set.add(t1);
+        expect(set.has(t1)).toBeTrue();
+        expect(set.has(t2)).toBeFalse();
+        expect(set.length).toEqual(1);
+    })
+
+    it("adds a thing once only", () => {
+        const t1 = new Thing();
+        const set = new HashSet();
+        set.add(t1);
+        set.add(t1);
+        expect(set.has(t1)).toBeTrue();
+        expect(set.length).toEqual(1);
+    })
+
+    it("adds 2 things with same hash code", () => {
+        const t1 = new Thing();
+        const t2 = new Thing();
+        t2.value1 = t1.value1;
+        const set = new HashSet();
+        set.add(t1);
+        set.add(t2);
+        expect(set.has(t1)).toBeTrue();
+        expect(set.has(t2)).toBeTrue();
+        expect(set.length).toEqual(2);
+    })
+
+})

runtime/JavaScript/spec/IntervalSetSpec.js

@@ -1,7 +1,6 @@
-import antlr4 from "../src/antlr4/index.node.js";
-const IntervalSet = antlr4.IntervalSet;
+import IntervalSet from "../src/antlr4/misc/IntervalSet.js";
 
-describe('IntervalSet', () => {
+describe('test IntervalSet', () => {
   it("computes interval set length", () => {
       const s1 = new IntervalSet();
       s1.addOne(20);