feat: currentEnvironment test

Author: joelgallant

app-config-node/src/environment.test.ts

@@ -0,0 +1,45 @@
+import { currentEnvironment } from './environment';
+
+describe('currentEnvironment', () => {
+  describe('deprecated currentEnvironment', () => {
+    it('uses environmentSourceNames', () => {
+      process.env.NODE_ENV = 'foo';
+      process.env.FOO = 'bar';
+
+      expect(currentEnvironment(undefined, ['FOO', 'BAR'])).toBe('bar');
+      expect(currentEnvironment(undefined, ['BAR'])).toBe(undefined);
+    });
+
+    it('uses environmentAliases', () => {
+      process.env.FOO = 'bar';
+      process.env.NODE_ENV = 'bar';
+
+      expect(currentEnvironment({}, ['FOO'])).toBe('bar');
+      expect(currentEnvironment({ bar: 'foo' })).toBe('foo');
+      expect(currentEnvironment({ bar: 'foo' }, ['FOO'])).toBe('foo');
+    });
+  });
+
+  it('uses envVarNames', () => {
+    process.env.NODE_ENV = 'foo';
+    process.env.FOO = 'bar';
+
+    expect(currentEnvironment({ envVarNames: ['FOO', 'BAR'] })).toBe('bar');
+    expect(currentEnvironment({ envVarNames: ['BAR'] })).toBe(undefined);
+  });
+
+  it('uses aliases', () => {
+    process.env.FOO = 'bar';
+    process.env.NODE_ENV = 'bar';
+
+    expect(currentEnvironment({ envVarNames: ['FOO'] })).toBe('bar');
+    expect(currentEnvironment({ aliases: { bar: 'foo' } })).toBe('foo');
+    expect(currentEnvironment({ aliases: { bar: 'foo' }, envVarNames: ['FOO'] })).toBe('foo');
+  });
+
+  it('uses override', () => {
+    process.env.NODE_ENV = 'foo';
+    expect(currentEnvironment({})).toBe('foo');
+    expect(currentEnvironment({ override: 'bar' })).toBe('bar');
+  });
+});