fix: min_coverage parsing with default to 100 (#290)

README.md

@@ -19,7 +19,7 @@ Very Good Coverage accepts the following configuration inputs:
 | Input name   | Description                                                                                                                                                                     | Default value           | Optional |
 | ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------- | -------- |
 | path         | The absolute path to the lcov.info file.                                                                                                                                        | `"/coverage/lcov.info"` | ✅       |
-| min_coverage | The minimum coverage percentage allowed.                                                                                                                                        | `100`                   | ✅       |
+| min_coverage | The minimum coverage percentage allowed. Must be a number between 0 and 100.                                                                                                    | `100`                   | ✅       |
 | exclude      | List of paths to exclude from the coverage report, separated by an empty space. Supports [globs](<https://en.wikipedia.org/wiki/Glob_(programming)>) to describe file patterns. | `""`                    | ✅       |
 
 ## Example usage

index.js

@@ -5,9 +5,17 @@ const fs = require('fs');
 
 function run() {
   const lcovPath = core.getInput('path');
-  const minCoverage = core.getInput('min_coverage');
+  const minCoverageInput = core.getInput('min_coverage');
   const excluded = core.getInput('exclude');
   const excludedFiles = excluded.split(' ');
+  const minCoverage = tryParseMinCoverage(minCoverageInput);
+
+  if (minCoverage === null) {
+    core.setFailed(
+      '❌ Failed to parse min_coverage. Make sure to enter a valid number between 0 and 100.',
+    );
+    return;
+  }
 
   if (!canParse(lcovPath)) {
     return;
@@ -46,15 +54,15 @@ function run() {
     const linesMissingCoverageByFile = Object.entries(linesMissingCoverage).map(
       ([file, lines]) => {
         return `- ${file}: ${lines.join(', ')}`;
-      }
+      },
     );
     let linesMissingCoverageMessage =
       `Lines not covered:\n` +
       linesMissingCoverageByFile.map((line) => `  ${line}`).join('\n');
     if (!isValidBuild) {
       core.setFailed(
         `${coverage} is less than min_coverage ${minCoverage}\n\n` +
-          linesMissingCoverageMessage
+          linesMissingCoverageMessage,
       );
     } else {
       var resultMessage = `Coverage: ${coverage}%.\n`;
@@ -89,7 +97,7 @@ For example:
   uses: VeryGoodOpenSource/very_good_coverage@v2
   with:
     path: 'my_project/coverage/lcov.info'      
-`
+`,
     );
     return false;
   }
@@ -99,12 +107,26 @@ For example:
       `❌ Found an empty lcov file at "${path}".
 An empty lcov file was found but with no coverage data. This might be because \
 you have no test files or your tests are not generating any coverage data.
-`
+`,
     );
     return false;
   }
 
   return true;
 }
 
+function tryParseMinCoverage(input) {
+  if (input === '') {
+    return 100;
+  }
+
+  const minCoverage = Number(input);
+
+  if (isNaN(minCoverage) || minCoverage < 0 || minCoverage > 100) {
+    return null;
+  }
+
+  return minCoverage;
+}
+
 run();

index.test.js

@@ -107,10 +107,11 @@ test('fails when the coverage is not 100 and min_coverage is not provided', () =
   process.env['INPUT_PATH'] = lcovPath;
   const ip = path.join(__dirname, 'index.js');
   try {
-    cp.execSync(`node ${ip}`, { env: process.env }).toString();
+    cp.execSync(`node ${ip}`, { env: process.env });
     fail('this code should fail');
   } catch (err) {
-    expect(err).toBeDefined();
+    const output = getErrorOutput(err);
+    expect(output).toContain('95 is less than min_coverage 100');
   }
 });
 
@@ -210,3 +211,39 @@ test('reports 0 coverage when no lines are found ', () => {
     expect(errorMessage).toContain('0 is less than min_coverage 100');
   }
 });
+
+test('fails when min_coverage is not a number', () => {
+  process.env['INPUT_MIN_COVERAGE'] = '10%';
+  const ip = path.join(__dirname, 'index.js');
+  try {
+    cp.execSync(`node ${ip}`, { env: process.env });
+    fail('this code should fail');
+  } catch (err) {
+    const output = getErrorOutput(err);
+    expect(output).toContain('❌ Failed to parse min_coverage.');
+  }
+});
+
+test('fails when min_coverage is lower than 0', () => {
+  process.env['INPUT_MIN_COVERAGE'] = -1;
+  const ip = path.join(__dirname, 'index.js');
+  try {
+    cp.execSync(`node ${ip}`, { env: process.env });
+    fail('this code should fail');
+  } catch (err) {
+    const output = getErrorOutput(err);
+    expect(output).toContain('❌ Failed to parse min_coverage.');
+  }
+});
+
+test('fails when min_coverage is greater than 100', () => {
+  process.env['INPUT_MIN_COVERAGE'] = 101;
+  const ip = path.join(__dirname, 'index.js');
+  try {
+    cp.execSync(`node ${ip}`, { env: process.env });
+    fail('this code should fail');
+  } catch (err) {
+    const output = getErrorOutput(err);
+    expect(output).toContain('❌ Failed to parse min_coverage.');
+  }
+});