test(typescript-estree): add unit tests for inferSingleRun function (#…

…8943)

test: add testCase

packages/typescript-estree/tests/lib/inferSingleRun.test.ts

@@ -0,0 +1,99 @@
+import * as path from 'path';
+
+import { inferSingleRun } from '../../src/parseSettings/inferSingleRun';
+
+describe('inferSingleRun', () => {
+  const originalEnvCI = process.env.CI;
+  const originalProcessArgv = process.argv;
+  const originalTSESTreeSingleRun = process.env.TSESTREE_SINGLE_RUN;
+
+  afterEach(() => {
+    process.env.CI = originalEnvCI;
+    process.argv = originalProcessArgv;
+    process.env.TSESTREE_SINGLE_RUN = originalTSESTreeSingleRun;
+  });
+
+  it.each(['project', 'programs'])(
+    'returns false when given %j is null',
+    key => {
+      const actual = inferSingleRun({ [key]: null });
+
+      expect(actual).toBe(false);
+    },
+  );
+
+  it.each([
+    ['true', true],
+    ['false', false],
+  ])('return %s when given TSESTREE_SINGLE_RUN is "%s"', (run, expected) => {
+    process.env.TSESTREE_SINGLE_RUN = run;
+
+    const actual = inferSingleRun({
+      programs: null,
+      project: './tsconfig.json',
+    });
+
+    expect(actual).toBe(expected);
+  });
+
+  it.each(['node_modules/.bin/eslint', 'node_modules/eslint/bin/eslint.js'])(
+    'returns true when singleRun is inferred from process.argv',
+    pathName => {
+      process.argv = ['', path.normalize(pathName), ''];
+
+      const actual = inferSingleRun({
+        programs: null,
+        project: './tsconfig.json',
+        allowAutomaticSingleRunInference: true,
+      });
+
+      expect(actual).toBe(true);
+    },
+  );
+
+  it('returns true when singleRun is inferred from CI=true', () => {
+    process.env.CI = 'true';
+
+    const actual = inferSingleRun({
+      programs: null,
+      project: './tsconfig.json',
+      allowAutomaticSingleRunInference: true,
+    });
+
+    expect(actual).toBe(true);
+  });
+
+  it('returns false when there is no way to infer singleRun', () => {
+    const actual = inferSingleRun({
+      programs: null,
+      project: './tsconfig.json',
+    });
+
+    expect(actual).toBe(false);
+  });
+
+  it('returns false even if CI=true when allowAutomaticSingleRunInference is not true', () => {
+    process.env.CI = 'true';
+
+    const actual = inferSingleRun({
+      programs: null,
+      project: './tsconfig.json',
+    });
+
+    expect(actual).toBe(false);
+  });
+
+  it.each(['node_modules/.bin/eslint', 'node_modules/eslint/bin/eslint.js'])(
+    'returns false even if singleRun is inferred from process.argv when allowAutomaticSingleRunInference is not true',
+    pathName => {
+      process.argv = ['', path.normalize(pathName), ''];
+
+      const actual = inferSingleRun({
+        programs: null,
+        project: './tsconfig.json',
+      });
+
+      expect(actual).toBe(false);
+    },
+  );
+});