ascii-cli-2: add test

Author: gtktsc

src/tests/cli.test.ts

@@ -0,0 +1,47 @@
+import { exec } from 'child_process';
+
+describe('plotter script', () => {
+  // @ts-expect-error tests
+  const execPlotterScript = (args, callback) => {
+    exec(`node node_modules/simple-ascii-chart/dist/cli.js ${args}`, callback);
+  };
+
+  it('should require the --input option', (done) => {
+    // @ts-expect-error tests
+    execPlotterScript('', (error, stdout, stderr) => {
+      expect(stderr).toContain('Missing required argument: input');
+      done();
+    });
+  });
+
+  it('should output a plot when given valid input', (done) => {
+    const validInput = JSON.stringify([
+      [1, 1],
+      [2, 2],
+      [3, 3],
+    ]);
+    // @ts-expect-error tests
+    execPlotterScript(`--input '${validInput}'`, (error, stdout, stderr) => {
+      expect(error).toBeNull();
+      expect(stderr).toBe('');
+      expect(stdout).toContain(`
+ ▲    
+3┤ ┏━ 
+2┤┏┛  
+1┤┛   
+ └┬┬┬▶
+  123 
+`);
+      done();
+    });
+  });
+
+  it('should handle invalid JSON input gracefully', (done) => {
+    const invalidInput = '[ invalid json';
+    // @ts-expect-error tests
+    execPlotterScript(`--input '${invalidInput}'`, (error, stdout, stderr) => {
+      expect(stderr).toContain('Oops! Something went wrong!');
+      done();
+    });
+  });
+});