test(versioning/conda): clarify latest is a valid version (#46246)

As a follow-up to 4b5a64e6e1, we should
make sure that we document the fact that `latest` is a valid version to
Conda.

Co-authored-by: Claude Sonnet 5 <jamie.tanna+claude-code@mend.io>

lib/modules/manager/github-actions/extract.spec.ts

@@ -2256,6 +2256,25 @@ describe('modules/manager/github-actions/extract', () => {
         },
       ],
     },
+    {
+      // `'latest'` is the default `pixi-version`, and is a valid version according to Conda versioning, but not one that can be used to bump the verson
+      step: {
+        uses: 'prefix-dev/setup-pixi@v0.8.3',
+        with: {
+          'pixi-version': 'latest',
+        },
+      },
+      expected: [
+        {
+          currentValue: 'latest',
+          datasource: 'github-releases',
+          depName: 'prefix-dev/pixi',
+          depType: 'uses-with',
+          packageName: 'prefix-dev/pixi',
+          versioning: 'conda',
+        },
+      ],
+    },
     {
       step: {
         uses: 'oven-sh/setup-bun@v2',

lib/modules/versioning/conda/index.spec.ts

@@ -18,6 +18,7 @@ describe('modules/versioning/conda/index', () => {
     ${'renovatebot/renovate'}                        | ${false}
     ${'renovatebot/renovate#master'}                 | ${false}
     ${'https://github.com/renovatebot/renovate.git'} | ${false}
+    ${'latest'}                                      | ${true}
   `('isVersion("$input") === $expected', ({ input, expected }) => {
     const res = !!api.isVersion(input);
     expect(res).toBe(expected);
@@ -39,6 +40,7 @@ describe('modules/versioning/conda/index', () => {
     ${'renovatebot/renovate'}                        | ${false}
     ${'renovatebot/renovate#master'}                 | ${false}
     ${'https://github.com/renovatebot/renovate.git'} | ${false}
+    ${'latest'}                                      | ${true}
   `('isValid("$input") === $expected', ({ input, expected }) => {
     const res = !!api.isValid(input);
     expect(res).toBe(expected);
@@ -123,6 +125,7 @@ describe('modules/versioning/conda/index', () => {
     ${'==1.*'}      | ${false}
     ${'*'}          | ${false}
     ${'>=1.0'}      | ${false}
+    ${'latest'}     | ${false}
   `('isSingleVersion("$version") === $isSingle', ({ version, isSingle }) => {
     const res = !!api.isSingleVersion(version);
     expect(res).toBe(isSingle);
@@ -185,6 +188,7 @@ describe('modules/versioning/conda/index', () => {
     ${'1.0.*'}   | ${'bump'}     | ${'1.0.0'}     | ${'1.2.3'} | ${'1.2.*'}
     ${'1.2.*'}   | ${'widen'}    | ${'1.0.0'}     | ${'1.2.3'} | ${'1.2.*'}
     ${'>=1.0.0'} | ${'bump'}     | ${'1.0.0'}     | ${'1.2.3'} | ${'>=1.2.3'}
+    ${'latest'}  | ${'replace'}  | ${'1.0.0'}     | ${'1.2.3'} | ${null}
   `(
     'getNewValue($currentValue, $rangeStrategy, $currentVersion, $newVersion) === $expected',
     ({ currentValue, rangeStrategy, currentVersion, newVersion, expected }) => {