Add unit tests (#24)

* Add unit tests

* Add GitHub Actions CI workflow

* Add Prettier

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: Node.js CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x, 18.x]
+
+    env:
+      CI: true
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test
+      - run: npm run lint

index.js

@@ -1,28 +1,29 @@
 const { Toolkit } = require("actions-toolkit");
 
 Toolkit.run(async (tools) => {
+  // Process inputs for use later
   const mode = tools.inputs.mode;
   const count = parseInt(tools.inputs.count, 10);
   const allowedLabels = tools.inputs.labels
     .split(",")
     .map((l) => l.trim())
     .filter((r) => r);
 
-  if (allowedLabels.length === 0) {
-    tools.exit.failure("Missing input 'labels'");
+  // Validate inputs
+  if (tools.inputs.count === "") {
+    tools.exit.failure(`[count] input is not provided`);
     return;
   }
 
-  // Validation
-  if (count === "") {
-    tools.exit.failure(`Missing input.count`);
+  if (allowedLabels.length === 0) {
+    tools.exit.failure("[labels] input is empty or not provided");
     return;
   }
 
   const allowedModes = ["exactly", "minimum", "maximum"];
   if (!allowedModes.includes(mode)) {
     tools.exit.failure(
-      `Unknown input.mode '${mode}'. Must be one of: ${allowedModes.join(", ")}`
+      `Unknown mode input [${mode}]. Must be one of: ${allowedModes.join(", ")}`
     );
     return;
   }
@@ -38,28 +39,35 @@ Toolkit.run(async (tools) => {
 
   const appliedLabels = labels.map((label) => label.name);
 
+  // How many labels overlap?
   let intersection = allowedLabels.filter((x) => appliedLabels.includes(x));
 
   if (mode === "exactly" && intersection.length !== count) {
     tools.exit.failure(
-      `Label error. Requires exactly ${count} of: ${allowedLabels.join(", ")}`
+      `Label error. Requires exactly ${count} of: ${allowedLabels.join(
+        ", "
+      )}. Found: ${appliedLabels.join(", ")}`
     );
     return;
   }
 
   if (mode === "minimum" && intersection.length < count) {
     tools.exit.failure(
-      `Label error. Requires at least ${count} of: ${allowedLabels.join(", ")}`
+      `Label error. Requires at least ${count} of: ${allowedLabels.join(
+        ", "
+      )}. Found: ${appliedLabels.join(", ")}`
     );
     return;
   }
 
   if (mode === "maximum" && intersection.length > count) {
     tools.exit.failure(
-      `Label error. Requires at most ${count} of: ${allowedLabels.join(", ")}`
+      `Label error. Requires at most ${count} of: ${allowedLabels.join(
+        ", "
+      )}. Found: ${appliedLabels.join(", ")}`
     );
     return;
   }
 
-  tools.exit.success("Action complete");
+  tools.exit.success("Complete");
 });

index.test.js

@@ -1,23 +1,252 @@
-const { Toolkit } = require('actions-toolkit')
+const { Toolkit } = require("actions-toolkit");
+const mockedEnv = require("mocked-env");
 
-describe('Required Labels', () => {
-  let action, tools
+describe("Required Labels", () => {
+  let action, tools;
 
   // Mock Toolkit.run to define `action` so we can call it
-  Toolkit.run = jest.fn((actionFn) => { action = actionFn })
+  Toolkit.run = jest.fn((actionFn) => {
+    action = actionFn;
+  });
+
   // Load up our entrypoint file
-  require('.')
+  require(".");
 
+  let restore;
+  let restoreTest;
   beforeEach(() => {
-    // Create a new Toolkit instance
-    tools = new Toolkit()
-    // Mock methods on it!
-    tools.exit.success = jest.fn()
-  })
-
-  it('exits successfully', () => {
-    action(tools)
-    expect(tools.exit.success).toHaveBeenCalled()
-    expect(tools.exit.success).toHaveBeenCalledWith('We did it!')
-  })
-})
+    restore = mockedEnv({
+      GITHUB_WORKFLOW: "demo-workflow",
+      GITHUB_ACTION: "required-labels",
+      GITHUB_ACTOR: "mheap",
+      GITHUB_REPOSITORY: "mheap/missing-repo",
+      GITHUB_WORKSPACE: "/github/workspace",
+      GITHUB_SHA: "e21490305ed7ac0897b7c7c54c88bb47f7a6d6c4",
+      GITHUB_EVENT_NAME: "",
+      GITHUB_EVENT_PATH: "",
+    });
+
+    tools = new Toolkit();
+    tools.context.loadPerTestEnv = function () {
+      this.payload = process.env.GITHUB_EVENT_PATH
+        ? require(process.env.GITHUB_EVENT_PATH)
+        : {};
+      this.event = process.env.GITHUB_EVENT_NAME;
+    };
+    tools.exit.success = jest.fn();
+    tools.exit.failure = jest.fn();
+  });
+
+  afterEach(() => {
+    restore();
+    restoreTest();
+    jest.resetModules();
+  });
+
+  describe("success", () => {
+    it("exact count", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement"], {
+        INPUT_LABELS: "enhancement,bug",
+        INPUT_MODE: "exactly",
+        INPUT_COUNT: "1",
+      });
+
+      action(tools);
+      expect(tools.exit.success).toBeCalledTimes(1);
+      expect(tools.exit.success).toBeCalledWith("Complete");
+    });
+
+    it("at least X", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement", "triage"], {
+        INPUT_LABELS: "enhancement,bug,triage",
+        INPUT_MODE: "minimum",
+        INPUT_COUNT: "2",
+      });
+
+      action(tools);
+      expect(tools.exit.success).toBeCalledTimes(1);
+      expect(tools.exit.success).toBeCalledWith("Complete");
+    });
+
+    it("at most X", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement", "triage"], {
+        INPUT_LABELS: "enhancement,bug,triage",
+        INPUT_MODE: "maximum",
+        INPUT_COUNT: "2",
+      });
+
+      action(tools);
+      expect(tools.exit.success).toBeCalledTimes(1);
+      expect(tools.exit.success).toBeCalledWith("Complete");
+    });
+  });
+
+  describe("failure", () => {
+    it("exact count", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement", "bug"], {
+        INPUT_LABELS: "enhancement,bug",
+        INPUT_MODE: "exactly",
+        INPUT_COUNT: "1",
+      });
+
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "Label error. Requires exactly 1 of: enhancement, bug. Found: enhancement, bug"
+      );
+    });
+
+    it("at least X", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement"], {
+        INPUT_LABELS: "enhancement,bug,triage",
+        INPUT_MODE: "minimum",
+        INPUT_COUNT: "2",
+      });
+
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "Label error. Requires at least 2 of: enhancement, bug, triage. Found: enhancement"
+      );
+    });
+
+    it("at most X", () => {
+      // Create a new Toolkit instance
+      restoreTest = mockPr(tools, ["enhancement", "triage", "bug"], {
+        INPUT_LABELS: "enhancement,bug,triage",
+        INPUT_MODE: "maximum",
+        INPUT_COUNT: "2",
+      });
+
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "Label error. Requires at most 2 of: enhancement, bug, triage. Found: enhancement, triage, bug"
+      );
+    });
+  });
+
+  describe("validation", () => {
+    it("missing INPUT_COUNT", () => {
+      restoreTest = mockPr(tools, [], {
+        INPUT_LABELS: "enhancement,bug",
+        INPUT_MODE: "exactly",
+      });
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "[count] input is not provided"
+      );
+    });
+
+    it("missing INPUT_LABELS", () => {
+      restoreTest = mockPr(tools, [], {
+        INPUT_MODE: "exactly",
+        INPUT_COUNT: "1",
+      });
+
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "[labels] input is empty or not provided"
+      );
+    });
+
+    it("unknown mode", () => {
+      restoreTest = mockPr(tools, [], {
+        INPUT_MODE: "bananas",
+        INPUT_LABELS: "enhancement,bug",
+        INPUT_COUNT: "1",
+      });
+
+      action(tools);
+      expect(tools.exit.failure).toBeCalledTimes(1);
+      expect(tools.exit.failure).toBeCalledWith(
+        "Unknown mode input [bananas]. Must be one of: exactly, minimum, maximum"
+      );
+    });
+  });
+
+  describe("data integrity", () => {
+    it("supports spaces in INPUT_LABELS", () => {
+      restoreTest = mockPr(tools, ["enhancement"], {
+        INPUT_LABELS: "enhancement ,   bug",
+        INPUT_MODE: "exactly",
+        INPUT_COUNT: "1",
+      });
+
+      action(tools);
+      expect(tools.exit.success).toBeCalledTimes(1);
+      expect(tools.exit.success).toBeCalledWith("Complete");
+    });
+
+    it("fetches labels from the API when provided with a GITHUB_TOKEN", async () => {
+      tools.github.issues.listLabelsOnIssue = jest
+        .fn()
+        .mockReturnValue(Promise.resolve({ data: [{ name: "enhancement" }] }));
+
+      restoreTest = mockPr(tools, ["should_not_be_used"], {
+        GITHUB_TOKEN: "this_is_a_test_token",
+        INPUT_LABELS: "enhancement ,   bug",
+        INPUT_MODE: "exactly",
+        INPUT_COUNT: "1",
+      });
+
+      await action(tools);
+
+      expect(tools.github.issues.listLabelsOnIssue).toBeCalledTimes(1);
+      expect(tools.github.issues.listLabelsOnIssue).toBeCalledWith({
+        issue_number: 28,
+        owner: "mheap",
+        repo: "missing-repo",
+      });
+
+      expect(tools.exit.success).toBeCalledTimes(1);
+      expect(tools.exit.success).toBeCalledWith("Complete");
+    });
+  });
+});
+
+function mockPr(tools, labels, env) {
+  return mockEvent(
+    tools,
+    "pull_request",
+    {
+      action: "opened",
+      pull_request: {
+        number: 28,
+        labels: labels.map((name) => {
+          return { name };
+        }),
+      },
+    },
+    env
+  );
+}
+
+function mockEvent(tools, eventName, mockPayload, additionalParams = {}) {
+  jest.mock(
+    "/github/workspace/event.json",
+    () => {
+      return mockPayload;
+    },
+    {
+      virtual: true,
+    }
+  );
+
+  const params = {
+    GITHUB_EVENT_NAME: eventName,
+    GITHUB_EVENT_PATH: "/github/workspace/event.json",
+    ...additionalParams,
+  };
+
+  const r = mockedEnv(params);
+  tools.context.loadPerTestEnv();
+  return r;
+}