added getPackageVersion tests

src/getPackageVersion.test.ts

@@ -0,0 +1,87 @@
+import { getPackageVersion } from "./getPackageVersion"
+
+describe("getPackageVersion", () => {
+  beforeEach(() => {
+    jest.resetModules()
+  })
+
+  const packagePath = "../package.json"
+
+  it("should return version without change when already valid", () => {
+    const packageJSON = {
+      version: "1.2.3",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "1.2.3"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+
+  it("should return version with prefix", () => {
+    const packageJSON = {
+      version: "v1.2.3",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "v1.2.3"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+
+  it("should return invalid version without change", () => {
+    const packageJSON = {
+      version: "a.b.c",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "a.b.c"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+
+  it("should return invalid version without build metadata", () => {
+    const packageJSON = {
+      version: "a.b.c+asd1234",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "a.b.c"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+
+  it("should return version without build metadata", () => {
+    const packageJSON = {
+      version: "1.2.3+asd1234",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "1.2.3"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+
+  it("should return version with prefix but without build metadata", () => {
+    const packageJSON = {
+      version: "v1.2.3+asd1234",
+    }
+    jest.mock(packagePath, () => {
+      return packageJSON
+    })
+
+    const expected = "v1.2.3"
+
+    expect(getPackageVersion(packagePath)).toEqual(expected)
+  })
+})