add test cases

Author: chouchouji

simple-git-hooks.test.js

@@ -361,6 +361,36 @@ describe("Simple Git Hooks tests", () => {
         expect(isEqual(installedHooks, {})).toBe(true);
       });
 
+      it("only removes git hooks which are not in preserveUnused", () => {
+        createGitHooksFolder(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON);
+
+        fs.writeFileSync(
+          path.join(path.normalize(
+            path.join(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON, ".git", "hooks")
+          ), "commit-msg"), 
+          TEST_SCRIPT
+        );
+
+        let installedHooks = getInstalledGitHooks(
+          path.normalize(
+              path.join(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON, ".git", "hooks")
+          )
+        );
+
+        simpleGitHooks.setHooksFromConfig(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON);
+
+        expect(isEqual(installedHooks, { "pre-commit": TEST_SCRIPT, "commit-msg": TEST_SCRIPT })).toBe(true);
+
+        simpleGitHooks.removeHooks(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON);
+
+        installedHooks = getInstalledGitHooks(
+            path.normalize(
+                path.join(PROJECT_WITH_UNUSED_CONF_IN_PACKAGE_JSON, ".git", "hooks")
+            )
+        );
+        expect(isEqual(installedHooks, { "commit-msg": TEST_SCRIPT })).toBe(true);
+      });
+
       it("creates git hooks and removes unused git hooks", () => {
         createGitHooksFolder(PROJECT_WITH_CONF_IN_PACKAGE_JSON);