add tests

Author: lobsterkatie

packages/nextjs/test/utils/isBuild.test.ts

@@ -0,0 +1,51 @@
+import { isBuild } from '../../src/utils/isBuild';
+
+let originalEnv: typeof process.env;
+let originalArgv: typeof process.argv;
+
+function assertNoMagicValues(): void {
+  if (Object.keys(process.env).includes('SENTRY_BUILD_PHASE') || process.argv.includes('build')) {
+    throw new Error('Not starting test with a clean setup');
+  }
+}
+
+describe('isBuild()', () => {
+  beforeEach(() => {
+    assertNoMagicValues();
+    originalEnv = { ...process.env };
+    originalArgv = [...process.argv];
+  });
+
+  afterEach(() => {
+    process.env = originalEnv;
+    process.argv = originalArgv;
+    assertNoMagicValues();
+  });
+
+  it("detects 'build' in argv", () => {
+    // the result of calling `next build`
+    process.argv = ['/abs/path/to/node', '/abs/path/to/nextjs/excecutable', 'build'];
+    expect(isBuild()).toBe(true);
+  });
+
+  it("sets env var when 'build' in argv", () => {
+    // the result of calling `next build`
+    process.argv = ['/abs/path/to/node', '/abs/path/to/nextjs/excecutable', 'build'];
+    isBuild();
+    expect(Object.keys(process.env).includes('SENTRY_BUILD_PHASE')).toBe(true);
+  });
+
+  it("does not set env var when 'build' not in argv", () => {
+    isBuild();
+    expect(Object.keys(process.env).includes('SENTRY_BUILD_PHASE')).toBe(false);
+  });
+
+  it('detects env var', () => {
+    process.env.SENTRY_BUILD_PHASE = 'true';
+    expect(isBuild()).toBe(true);
+  });
+
+  it("returns false when 'build' not in `argv` and env var not present", () => {
+    expect(isBuild()).toBe(false);
+  });
+});