Add a descriptive description at the changeset and add some unit test for three different scenarios

Signed-off-by: armandocomellas1 <cgarmando@google.com>

.changeset/many-pugs-change.md

@@ -2,4 +2,4 @@
 '@backstage/plugin-kubernetes-backend': patch
 ---
 
-Change add some lines in the script GkeClusterLocator.ts, the implementation consist in adding a piece of code starts in 58 adding some config.getString() method to find out if the app-config.yaml kubernetes config includes the type of Auth as googleServiceAccount
+The purpose of this patch is to add a new login method which is `googleServiceAccount` configuring the kubernetes properties in the app-config.yaml file with authProvider key

plugins/kubernetes-backend/src/cluster-locator/GkeClusterLocator.test.ts

@@ -382,5 +382,108 @@ describe('GkeClusterLocator', () => {
         parent: 'projects/some-project/locations/some-region',
       });
     });
+    it('return google login when no authProvider is specified', async () => {
+      mockedListClusters.mockReturnValueOnce([
+        {
+          clusters: [
+            {
+              name: 'some-cluster',
+              endpoint: '1.2.3.4',
+            },
+          ],
+        },
+      ]);
+
+      const config: Config = new ConfigReader({
+        type: 'gke',
+        projectId: 'some-project',
+      });
+
+      const sut = GkeClusterLocator.fromConfigWithClient(config, {
+        listClusters: mockedListClusters,
+      } as any);
+
+      const result = await sut.getClusters();
+
+      expect(result).toStrictEqual([
+        {
+          name: 'some-cluster',
+          url: 'https://1.2.3.4',
+          authMetadata: { [ANNOTATION_KUBERNETES_AUTH_PROVIDER]: 'google' },
+          skipTLSVerify: false,
+          skipMetricsLookup: false,
+        },
+      ]);
+    });
+    it('return googleServiceAccount login when authProvider is specified', async () => {
+      mockedListClusters.mockReturnValueOnce([
+        {
+          clusters: [
+            {
+              name: 'some-cluster',
+              endpoint: '1.2.3.4',
+            },
+          ],
+        },
+      ]);
+
+      const config: Config = new ConfigReader({
+        type: 'gke',
+        projectId: 'some-project',
+        authProvider: 'googleServiceAccount',
+      });
+
+      const sut = GkeClusterLocator.fromConfigWithClient(config, {
+        listClusters: mockedListClusters,
+      } as any);
+
+      const result = await sut.getClusters();
+
+      expect(result).toStrictEqual([
+        {
+          name: 'some-cluster',
+          url: 'https://1.2.3.4',
+          authMetadata: {
+            [ANNOTATION_KUBERNETES_AUTH_PROVIDER]: 'googleServiceAccount',
+          },
+          skipTLSVerify: false,
+          skipMetricsLookup: false,
+        },
+      ]);
+    });
+    it('return google login when authProvider property has invalid value', async () => {
+      mockedListClusters.mockReturnValueOnce([
+        {
+          clusters: [
+            {
+              name: 'some-cluster',
+              endpoint: '1.2.3.4',
+            },
+          ],
+        },
+      ]);
+
+      const config: Config = new ConfigReader({
+        type: 'gke',
+        projectId: 'some-project',
+        authProvider: 'differentValue',
+      });
+
+      const sut = GkeClusterLocator.fromConfigWithClient(config, {
+        listClusters: mockedListClusters,
+      } as any);
+
+      const result = await sut.getClusters();
+
+      expect(result).toStrictEqual([
+        {
+          name: 'some-cluster',
+          url: 'https://1.2.3.4',
+          authMetadata: { [ANNOTATION_KUBERNETES_AUTH_PROVIDER]: 'google' },
+          skipTLSVerify: false,
+          skipMetricsLookup: false,
+        },
+      ]);
+    });
   });
 });

plugins/kubernetes-backend/src/cluster-locator/GkeClusterLocator.ts

@@ -55,18 +55,11 @@ export class GkeClusterLocator implements KubernetesClustersSupplier {
         return { key: mrl.getString('key'), value: mrl.getString('value') };
       }) ?? [];
 
-    let storeAuthProviderString: string;
-    let getGkeProperty;
-    try {
-      getGkeProperty = config.getString('authProvider');
-    } catch (err) {
-      getGkeProperty = 'google';
-    }
-    if (getGkeProperty === 'googleServiceAccount') {
-      storeAuthProviderString = 'googleServiceAccount';
-    } else {
-      storeAuthProviderString = 'google';
-    }
+    const storeAuthProviderString =
+      config.getOptionalString('authProvider') === 'googleServiceAccount'
+        ? 'googleServiceAccount'
+        : 'google';
+
     const options = {
       projectId: config.getString('projectId'),
       authProvider: storeAuthProviderString,