implemented SlopStore and tested

spec/indexeddb_spec.js

@@ -153,7 +153,26 @@ describe("SlopStore", () => {
         db.close()
     })
 
-    it("passes", () => {
-        expect(true).toBeTrue()
+    it("stores slop", async () => {
+        const stored = await slopdb.slop_store.store("its-slop.slop", "some/slop")
+        expect(stored).toBe("its-slop.slop")
+
+        const retrieved = await slopdb.slop_store.get(new URL("http://its-slop.slop/some/slop"))
+        const expected_set = new Set()
+        expected_set.add("some/slop")
+        expect(retrieved).toEqual({domain: "its-slop.slop", paths: expected_set})
+    })
+
+    it("stores new slop paths to existing domains", async () => {
+        const stored = await slopdb.slop_store.store("its-slop.slop", "some/slop")
+        const new_path = await slopdb.slop_store.store("its-slop.slop", "some/other/slop")
+        expect(new_path).toBe("its-slop.slop")
+
+        const expected_set = new Set()
+        expected_set.add("some/slop")
+        expected_set.add("some/other/slop")
+
+        const retrieved = await slopdb.slop_store.get(new URL("http://its-slop.slop/some/slop"))
+        expect(retrieved).toEqual({domain: "its-slop.slop", paths: expected_set})
     })
 })