feat: add ability to create pre-release tags (#17)

Reviewed-on: #17
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

src/main.spec.ts

@@ -149,6 +149,16 @@ describe("TagService", () => {
       const result = tagService.renderTag(tag, "v");
       expect(result).toBe("v1.2.3");
     });
+
+    it("should render tag with prerelease suffix", () => {
+      const result = tagService.renderTag(tag, "", "-rc-abc123");
+      expect(result).toBe("1.2.3-rc-abc123");
+    });
+
+    it("should render tag with prefix and prerelease suffix", () => {
+      const result = tagService.renderTag(tag, "v", "-rc-abc123");
+      expect(result).toBe("v1.2.3-rc-abc123");
+    });
   });
 
   describe("parseTag", () => {
@@ -221,7 +231,7 @@ describe("TagIncrementer", () => {
       const result = await tagIncrementer.getBaseTag(undefined);
 
       expect(result).toBe("v2.0.0");
-      expect(mockCoreService.getLogs()).toContain("INFO: Using latest tag: v2.0.0");
+      expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v2.0.0");
     });
 
     it("should default to 0.0.0 when no tags found", async () => {
@@ -234,6 +244,34 @@ describe("TagIncrementer", () => {
         "WARNING: No tags found in repository, defaulting to 0.0.0"
       );
     });
+
+    it("should skip pre-release tags and use latest real tag", async () => {
+      mockGitService.setMockTags([
+        { name: "v2.0.0-rc-26035c6e13" },
+        { name: "v1.2.3" },
+        { name: "v1.1.4-rc-aa512edb16" },
+        { name: "v1.0.0" },
+      ]);
+
+      const result = await tagIncrementer.getBaseTag(undefined);
+
+      expect(result).toBe("v1.2.3");
+      expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v1.2.3");
+    });
+
+    it("should default to 0.0.0 when only pre-release tags found", async () => {
+      mockGitService.setMockTags([
+        { name: "v2.0.0-rc-26035c6e13" },
+        { name: "v1.1.4-rc-aa512edb16" },
+      ]);
+
+      const result = await tagIncrementer.getBaseTag(undefined);
+
+      expect(result).toBe("0.0.0");
+      expect(mockCoreService.getWarnings()).toContain(
+        "WARNING: No real tags found (only pre-release tags), defaulting to 0.0.0"
+      );
+    });
   });
 
   describe("determineIncrementType", () => {
@@ -302,6 +340,28 @@ describe("TagIncrementer", () => {
 
       expect(result).toBe("2.1.1");
     });
+
+    it("should create prerelease tag when prerelease is true", async () => {
+      mockGitService.setMockTags([{ name: "v1.2.3" }]);
+      mockGitService.setMockCommit({
+        commit: { message: "feat: new feature" },
+      });
+
+      const result = await tagIncrementer.incrementTag(undefined, "ref", 50, true, "abc123");
+
+      expect(result).toBe("1.3.0-rc-abc123");
+    });
+
+    it("should not create prerelease tag when prerelease is false", async () => {
+      mockGitService.setMockTags([{ name: "v1.2.3" }]);
+      mockGitService.setMockCommit({
+        commit: { message: "feat: new feature" },
+      });
+
+      const result = await tagIncrementer.incrementTag(undefined, "ref", 50, false, "abc123");
+
+      expect(result).toBe("1.3.0");
+    });
   });
 });
 
@@ -315,14 +375,18 @@ describe("LocalGitService", () => {
 
   describe("listTags", () => {
     it("should call git command to list tags", async () => {
-      mockExecSync.mockReturnValue("v1.0.0\nv1.1.0\n" as any);
+      mockExecSync.mockReturnValue("v1.0.0\n1.1.0\n2.0.0-rc-26035c6e13\n" as any);
 
       const result = await localGitService.listTags(5);
 
       expect(mockExecSync).toHaveBeenCalledWith("git tag --sort=-version:refname", {
         encoding: "utf8",
       });
-      expect(result).toEqual([{ name: "v1.0.0" }, { name: "v1.1.0" }]);
+      expect(result).toEqual([
+        { name: "v1.0.0" },
+        { name: "1.1.0" },
+        { name: "2.0.0-rc-26035c6e13" },
+      ]);
     });
 
     it("should return empty array when no tags exist", async () => {
@@ -391,9 +455,12 @@ describe("LocalCoreService", () => {
 // Integration test example
 describe("TagIncrementer Integration", () => {
   it("should handle complete tag increment flow", async () => {
-    const mockGitService = new MockGitService([{ name: "v1.2.3" }], {
-      commit: { message: "feat: new feature" },
-    });
+    const mockGitService = new MockGitService(
+      [{ name: "v2.0.0-rc-26035c6e13" }, { name: "v1.1.4-rc-aa512edb16" }, { name: "v1.2.3" }],
+      {
+        commit: { message: "feat: new feature" },
+      }
+    );
     const mockCoreService = new MockCoreService();
     const commitAnalyzer = new ConventionalCommitAnalyzer();
     const tagService = new TagService();
@@ -410,5 +477,23 @@ describe("TagIncrementer Integration", () => {
     expect(result).toBe("1.3.0");
     expect(mockCoreService.getLogs()).toContain("INFO: Determined increment type: minor");
     expect(mockCoreService.getLogs()).toContain("INFO: New tag: 1.3.0");
+    expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v1.2.3");
+  });
+});
+
+describe("Prerelease Validation", () => {
+  it("should validate prerelease configuration correctly", () => {
+    // Test cases for prerelease validation logic
+    const testCases = [
+      { prerelease: true, githubSha: "abc123", shouldFail: false },
+      { prerelease: true, githubSha: "", shouldFail: true },
+      { prerelease: false, githubSha: "abc123", shouldFail: false },
+      { prerelease: false, githubSha: "", shouldFail: false },
+    ];
+
+    testCases.forEach(({ prerelease, githubSha, shouldFail }) => {
+      const result = prerelease && !githubSha;
+      expect(result).toBe(shouldFail);
+    });
   });
 });