Grade school

typescript/grade-school/grade-school.test.ts

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+import { GradeSchool } from "./grade-school";
+
+describe("School", () => {
+  let school: GradeSchool;
+
+  beforeEach(() => {
+    school = new GradeSchool();
+  });
+
+  it("a new school has an empty roster", () => {
+    expect(school.roster()).toEqual({});
+  });
+
+  it("adding a student adds them to the roster for the given grade", () => {
+    school.add("Aimee", 2);
+
+    const expectedDb = { 2: ["Aimee"] };
+    expect(school.roster()).toEqual(expectedDb);
+  });
+
+  it("adding more students to the same grade adds them to the roster", () => {
+    school.add("Blair", 2);
+    school.add("James", 2);
+    school.add("Paul", 2);
+
+    const expectedDb = { 2: ["Blair", "James", "Paul"] };
+    expect(school.roster()).toEqual(expectedDb);
+  });
+
+  it("adding students to different grades adds them to the roster", () => {
+    school.add("Chelsea", 3);
+    school.add("Logan", 7);
+
+    const expectedDb = { 3: ["Chelsea"], 7: ["Logan"] };
+    expect(school.roster()).toEqual(expectedDb);
+  });
+
+  it("grade returns the students in that grade in alphabetical order", () => {
+    school.add("Franklin", 5);
+    school.add("Bradley", 5);
+    school.add("Jeff", 1);
+
+    const expectedStudents = ["Bradley", "Franklin"];
+    expect(school.grade(5)).toEqual(expectedStudents);
+  });
+
+  it("grade returns an empty array if there are no students in that grade", () => {
+    expect(school.grade(1)).toEqual([]);
+  });
+
+  it("the students names in each grade in the roster are sorted", () => {
+    school.add("Jennifer", 4);
+    school.add("Kareem", 6);
+    school.add("Christopher", 4);
+    school.add("Kyle", 3);
+
+    const expectedSortedStudents = {
+      3: ["Kyle"],
+      4: ["Christopher", "Jennifer"],
+      6: ["Kareem"],
+    };
+    expect(school.roster()).toEqual(expectedSortedStudents);
+  });
+
+  it("roster cannot be modified outside of module", () => {
+    school.add("Aimee", 2);
+    const roster = school.roster();
+    roster[2].push("Oops.");
+    const expectedDb = { 2: ["Aimee"] };
+    expect(school.roster()).toEqual(expectedDb);
+  });
+
+  it("roster cannot be modified outside of module using grade()", () => {
+    school.add("Aimee", 2);
+    school.grade(2).push("Oops.");
+    const expectedDb = { 2: ["Aimee"] };
+    expect(school.roster()).toEqual(expectedDb);
+  });
+
+  it("a student can't be in two different grades", () => {
+    school.add("Aimee", 2);
+    school.add("Aimee", 1);
+
+    expect(school.grade(2)).toEqual([]);
+  });
+});