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test: cover MCP_STRICT_ENV leading-space mixed-case true-with-surrounding-CRLF semantics #202

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test: cover MCP_STRICT_ENV leading-space mixed-case true-with-surrounding-CRLF semantics #202

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22 changes: 22 additions & 0 deletions tests/config.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,28 @@ describe('config', () => {
delete process.env.MCP_STRICT_ENV;
});


test('treats MCP_STRICT_ENV with surrounding-CRLF leading-space mixed-case true as strict mode', async () => {
process.env.MCP_STRICT_ENV = '\r\n True\r\n';

const configPath = join(tempDir, 'missing_env_leading_space_mixed_case_true_surrounded_crlf.json');
await writeFile(
configPath,
JSON.stringify({
mcpServers: {
test: {
command: 'echo',
env: { TOKEN: '${NONEXISTENT_VAR}' },
},
},
})
);

await expect(loadConfig(configPath)).rejects.toThrow('Missing environment variable');

delete process.env.MCP_STRICT_ENV;
});

test('throws error on missing env vars in strict mode (default)', async () => {
// Ensure strict mode is enabled (default)
delete process.env.MCP_STRICT_ENV;
Expand Down