Add tests for netlify build

src/tests/build.test.js

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+const test = require('ava')
+const execa = require('execa')
+
+const BIN_PATH = `${__dirname}/../../bin/run`
+const FIXTURE_DIR = __dirname
+
+// Runs `netlify build ...flags` then verify:
+//  - its exit code is `exitCode`
+//  - that its output contains `output`
+// The command is run in the fixture directory `fixtureSubDir`.
+const runBuildCommand = async function(t, fixtureSubDir, { exitCode: expectedExitCode = 0, output, flags = [] } = {}) {
+  const { all, exitCode } = await execa(BIN_PATH, ['build', ...flags], {
+    reject: false,
+    cwd: `${FIXTURE_DIR}/${fixtureSubDir}`,
+    env: { FORCE_COLOR: '1' },
+    all: true
+  })
+  t.is(exitCode, expectedExitCode)
+  t.true(all.includes(output))
+}
+
+test('build command - succeeds', async t => {
+  await runBuildCommand(t, 'success-site', { output: 'testCommand' })
+})
+
+test('build command - fails', async t => {
+  await runBuildCommand(t, 'failure-site', { exitCode: 1, output: 'doesNotExist' })
+})
+
+test('build command - uses the CLI mode', async t => {
+  await runBuildCommand(t, 'success-site', { output: 'mode: cli' })
+})
+
+test('build command - can use the --dry flag', async t => {
+  await runBuildCommand(t, 'success-site', { flags: ['--dry'], output: 'If this looks good to you' })
+})
+
+test('build command - can use the --context flag', async t => {
+  await runBuildCommand(t, 'context-site', { flags: ['--context=staging'], output: 'testStaging' })
+})
+
+test('build command - can run in subdirectories', async t => {
+  await runBuildCommand(t, 'subdir-site/subdir', { output: 'testCommand' })
+})
+
+test('build command - wrong config', async t => {
+  await runBuildCommand(t, 'wrong-config-site', { exitCode: 1, output: 'Invalid syntax' })
+})

src/tests/context-site/netlify.toml

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+[build]
+command = "echo testCommand"
+
+[context.staging]
+command = "echo testStaging"

src/tests/failure-site/netlify.toml

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+[build]
+command = "doesNotExist"

src/tests/subdir-site/netlify.toml

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+[build]
+command = "echo testCommand"

src/tests/success-site/netlify.toml

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+[build]
+command = "echo testCommand"

src/tests/wrong-config-site/netlify.toml

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+[build]
+command = false