diff --git a/__tests__/finder.test.ts b/__tests__/finder.test.ts
index 6ad7638..44f10bd 100644
--- a/__tests__/finder.test.ts
+++ b/__tests__/finder.test.ts
@@ -30,11 +30,41 @@ process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
 import * as finder from '../src/find-python';
 
 describe('Finder tests', () => {
-  it('Finds Python if it is installed', async () => {});
+  it('Finds Python if it is installed', async () => {
+    const pythonDir: string = path.join(toolDir, 'python', '2.0.0', 'x64');
+    await io.mkdirP(pythonDir);
+    fs.writeFileSync(`${pythonDir}.complete`, 'hello');
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    await finder.findPythonVersion('2.x', 'x64');
+  });
 
-  it('Errors if Python is not installed', async () => {});
+  it('Errors if Python is not installed', async () => {
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    let thrown = false;
+    try {
+      await finder.findPythonVersion('3.x', 'x64');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBeTruthy();
+  });
 
-  it('Finds PyPy if it is installed', async () => {});
+  it('Finds PyPy if it is installed', async () => {
+    const pythonDir: string = path.join(toolDir, 'PyPy', '2.0.0', 'x64');
+    await io.mkdirP(pythonDir);
+    fs.writeFileSync(`${pythonDir}.complete`, 'hello');
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    await finder.findPythonVersion('pypy2', 'x64');
+  });
 
-  it('Errors if PyPy is not installed', async () => {});
+  it('Errors if PyPy is not installed', async () => {
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    let thrown = false;
+    try {
+      await finder.findPythonVersion('pypy3', 'x64');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBeTruthy();
+  });
 });