From ddedf7aab5142a652116f4db82d6e2e828c9dab9 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Fri, 10 Sep 2021 17:44:06 +0200
Subject: [PATCH] version-bridge: added tests

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 .../src/lib/VersionedContext.test.tsx         | 100 ++++++++++++++++++
 .../src/lib/VersionedValue.test.ts            |  40 +++++++
 2 files changed, 140 insertions(+)
 create mode 100644 packages/version-bridge/src/lib/VersionedContext.test.tsx
 create mode 100644 packages/version-bridge/src/lib/VersionedValue.test.ts

diff --git a/packages/version-bridge/src/lib/VersionedContext.test.tsx b/packages/version-bridge/src/lib/VersionedContext.test.tsx
new file mode 100644
index 0000000000..bbd924780d
--- /dev/null
+++ b/packages/version-bridge/src/lib/VersionedContext.test.tsx
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import React, { useContext } from 'react';
+import { renderHook } from '@testing-library/react-hooks';
+import {
+  createVersionedContext,
+  createVersionedContextForTesting,
+  useVersionedContext,
+} from './VersionedContext';
+import { createVersionedValueMap } from './VersionedValue';
+
+type ContextType = { 1: string; 2: string };
+
+describe('VersionedContext', () => {
+  it('should provide a versioned value', () => {
+    const Context = createVersionedContext<ContextType>('test-context-1');
+
+    const rendered = renderHook(() => useContext(Context), {
+      wrapper: ({ children }) => (
+        <Context.Provider
+          value={createVersionedValueMap({ 1: '1v1', 2: '1v2' })}
+        >
+          {children}
+        </Context.Provider>
+      ),
+    });
+
+    expect(rendered.result.current?.atVersion(1)).toBe('1v1');
+    expect(rendered.result.current?.atVersion(2)).toBe('1v2');
+  });
+
+  it('should provide a versioned value to hook', () => {
+    const Context = createVersionedContext<ContextType>('test-context-2');
+
+    const rendered = renderHook(() => useVersionedContext('test-context-2'), {
+      wrapper: ({ children }) => (
+        <Context.Provider
+          value={createVersionedValueMap({ 1: '2v1', 2: '2v2' })}
+        >
+          {children}
+        </Context.Provider>
+      ),
+    });
+
+    expect(rendered.result.current?.atVersion(1)).toBe('2v1');
+    expect(rendered.result.current?.atVersion(2)).toBe('2v2');
+  });
+
+  it('should be provide a test utility', () => {
+    const context = createVersionedContextForTesting('test-context-3');
+
+    const rendered = renderHook(() => useVersionedContext('test-context-3'));
+
+    expect(() => rendered.result.current).toThrow(
+      'Global test-context-3 is not set',
+    );
+    context.set({ 1: '3v1' });
+    expect(() => rendered.result.current).toThrow(
+      'Global test-context-3 is not set',
+    );
+    // should need a rerender before update
+    rendered.rerender();
+
+    expect(rendered.result.current?.atVersion(1)).toBe('3v1');
+    expect(rendered.result.current?.atVersion(2)).toBeUndefined();
+
+    context.set({ 2: '3v2' });
+    rendered.rerender();
+
+    expect(rendered.result.current?.atVersion(1)).toBeUndefined();
+    expect(rendered.result.current?.atVersion(2)).toBe('3v2');
+
+    context.reset();
+    rendered.rerender();
+    expect(() => rendered.result.current).toThrow(
+      'Global test-context-3 is not set',
+    );
+
+    context.set({ 1: '3v1', 2: '3v2' });
+
+    rendered.rerender();
+
+    expect(rendered.result.current?.atVersion(1)).toBe('3v1');
+    expect(rendered.result.current?.atVersion(2)).toBe('3v2');
+  });
+});
diff --git a/packages/version-bridge/src/lib/VersionedValue.test.ts b/packages/version-bridge/src/lib/VersionedValue.test.ts
new file mode 100644
index 0000000000..2b6637a96f
--- /dev/null
+++ b/packages/version-bridge/src/lib/VersionedValue.test.ts
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { createVersionedValueMap } from './VersionedValue';
+
+describe('createVersionedValueMap', () => {
+  it('should be empty', () => {
+    const map = createVersionedValueMap({});
+
+    // @ts-expect-error
+    expect(map.atVersion(1 as any)).toBe(undefined);
+  });
+
+  it('should access values by version', () => {
+    const map = createVersionedValueMap({ 1: 'v1', 2: 'v2' });
+
+    expect(map.atVersion(1)).toBe('v1');
+    expect(map.atVersion(2)).toBe('v2');
+
+    // @ts-expect-error
+    expect(map.atVersion(0)).toBe(undefined);
+    // @ts-expect-error
+    expect(map.atVersion(NaN)).toBe(undefined);
+    // @ts-expect-error
+    expect(map.atVersion(Infinity)).toBe(undefined);
+  });
+});