chore(core): monorepo, esm targeting, improved management (#8707)

packages/webpack/helpers/projectHelpers.spec.js

@@ -0,0 +1,132 @@
+const { getIndentationCharacter, writePackageJson, safeGet } = require("./projectHelpers");
+const fs = require("fs");
+
+describe('projectHelpers', () => {
+    const originalReadFileSync = fs.readFileSync;
+    const originalWriteFileSync = fs.writeFileSync;
+    const tab = "\t";
+    const multipleSpaces = "        ";
+    const twoSpaces = "  ";
+
+    afterEach(() => {
+        fs.readFileSync = originalReadFileSync;
+        fs.writeFileSync = originalWriteFileSync;
+    });
+
+    describe('getIndentationCharacter', () => {
+        [
+            {
+                testName: 'returns two spaces when file starts with two spaces',
+                input: `{${twoSpaces}"abc": "1"${twoSpaces}}`,
+                expectedResult: twoSpaces
+			},
+			{
+                testName: 'returns two spaces when file starts with two spaces and binary content is passed',
+                input: Buffer.from(`{${twoSpaces}"abc": "1"${twoSpaces}}`),
+                expectedResult: twoSpaces
+            },
+            {
+                testName: 'returns empty string when file starts without any indentation',
+                input: `{"abc": "1"}`,
+                expectedResult: ''
+            },
+            {
+                testName: 'returns tab when file starts with tab',
+                input: `{${tab}"abc": "1"${tab}}`,
+                expectedResult: tab
+            },
+            {
+                testName: 'returns two spaces when file starts with two spaces and new line before them',
+                input: `{\n${twoSpaces}"abc": "1"\n}`,
+                expectedResult: twoSpaces
+            },
+            {
+                testName: 'returns tab when file starts with tab and new line before them',
+                input: `{\n${tab}"abc": "1"\n}`,
+                expectedResult: tab
+            },
+            {
+                testName: 'returns multiple spaces when file starts with multiple spaces and new line before them',
+                input: `{\n${multipleSpaces}"abc": "1"\n}`,
+                expectedResult: multipleSpaces
+            }
+        ].forEach(({ testName, input, expectedResult }) => {
+            it(testName, () => {
+                expect(getIndentationCharacter(input)).toEqual(expectedResult);
+            });
+        });
+    });
+
+    describe('safeGet', () => {
+        it('should return the correct value of existing properties', () => {
+            const obj = { a: 15 };
+            expect(safeGet(obj, 'a')).toBe(15);
+        });
+
+        it('should return undefined for unexisting properties', () => {
+            const obj = { a: 15 };
+            expect(safeGet(obj, 'random')).toBeUndefined();
+        });
+
+        it('should return undefined when the first argument is undefined', () => {
+            let obj;
+            expect(safeGet(obj, 'random')).toBeUndefined();
+        });
+
+        it('should return undefined when the first argument is not an object and does not have inherited property with the queried name', () => {
+            const num = 15;
+            expect(safeGet(num, 'random')).toBeUndefined();
+        });
+    });
+
+    describe('writePackageJson', () => {
+        const mockFileSystemApi = () => {
+            const data = {
+                isWriteFileSyncCalled: false
+            };
+
+            fs.readFileSync = (p) => {
+                return JSON.stringify({ a: 1 });
+            };
+
+            fs.writeFileSync = (p, c) => {
+                data.isWriteFileSyncCalled = true;
+            };
+
+            return data;
+        };
+
+        it('does not write package.json when content has not changed', () => {
+            const data = mockFileSystemApi();
+            writePackageJson({ a: 1 }, "projDir");
+            expect(data.isWriteFileSyncCalled).toBe(false);
+        });
+
+        it('writes content, when the new one is different from the current one', () => {
+            const data = mockFileSystemApi();
+            writePackageJson({ b: 2 }, "projDir");
+            expect(data.isWriteFileSyncCalled).toBe(true);
+        });
+
+        it('keeps indentation of the package.json when rewriting it', () => {
+            let currentIndentSymbol = tab;
+            fs.readFileSync = (p) => {
+                return JSON.stringify({ a: 1 }, null, currentIndentSymbol);
+            };
+
+            let writtenContent = null;
+            fs.writeFileSync = (p, c) => {
+                writtenContent = c;
+            };
+
+            // Ensure tab indentation is persisted
+            writePackageJson({ b: 2 }, "projDir");
+            expect(writtenContent).toBe(`{\n${tab}"b": 2\n}`);
+
+            // Ensure spaces indentation is persisted
+            currentIndentSymbol = multipleSpaces;
+            writePackageJson({ b: 2 }, "projDir");
+            expect(writtenContent).toBe(`{\n${multipleSpaces}"b": 2\n}`);
+        });
+    });
+});