order & limit implementation WIP

spec/value_extractor.spec.js

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+const {NoteBuilder, findNoteByTitle, note} = require('./note_cache_mocking');
+const ValueExtractor = require('../src/services/search/value_extractor');
+const noteCache = require('../src/services/note_cache/note_cache');
+
+describe("Value extractor", () => {
+    beforeEach(() => {
+        noteCache.reset();
+    });
+
+    it("simple title extraction", async () => {
+        const europe = note("Europe").note;
+
+        const valueExtractor = new ValueExtractor(["note", "title"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(europe)).toEqual("Europe");
+    });
+
+    it("label extraction", async () => {
+        const austria = note("Austria")
+            .label("Capital", "Vienna")
+            .note;
+
+        let valueExtractor = new ValueExtractor(["note", "labels", "capital"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(austria)).toEqual("vienna");
+
+        valueExtractor = new ValueExtractor(["#capital"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(austria)).toEqual("vienna");
+    });
+
+    it("parent/child property extraction", async () => {
+        const vienna = note("Vienna");
+        const europe = note("Europe")
+            .child(note("Austria")
+                .child(vienna));
+
+        let valueExtractor = new ValueExtractor(["note", "children", "children", "title"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(europe.note)).toEqual("Vienna");
+
+        valueExtractor = new ValueExtractor(["note", "parents", "parents", "title"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(vienna.note)).toEqual("Europe");
+    });
+
+    it("extract through relation", async () => {
+        const czechRepublic = note("Czech Republic").label("capital", "Prague");
+        const slovakia = note("Slovakia").label("capital", "Bratislava");
+        const austria = note("Austria")
+                .relation('neighbor', czechRepublic.note)
+                .relation('neighbor', slovakia.note);
+
+        let valueExtractor = new ValueExtractor(["note", "relations", "neighbor", "labels", "capital"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(austria.note)).toEqual("prague");
+
+        valueExtractor = new ValueExtractor(["~neighbor", "labels", "capital"]);
+
+        expect(valueExtractor.validate()).toBeFalsy();
+        expect(valueExtractor.extract(austria.note)).toEqual("prague");
+    });
+});
+
+describe("Invalid value extractor property path", () => {
+    it('each path must start with "note" (or label/relation)',
+        () => expect(new ValueExtractor(["neighbor"]).validate()).toBeTruthy());
+
+    it("extra path element after terminal label",
+        () => expect(new ValueExtractor(["~neighbor", "labels", "capital", "noteId"]).validate()).toBeTruthy());
+
+    it("extra path element after terminal title",
+        () => expect(new ValueExtractor(["note", "title", "isProtected"]).validate()).toBeTruthy());
+
+    it("relation name and note property is missing",
+        () => expect(new ValueExtractor(["note", "relations"]).validate()).toBeTruthy());
+
+    it("relation is specified but target note property is not specified",
+        () => expect(new ValueExtractor(["note", "relations", "myrel"]).validate()).toBeTruthy());
+});