Add tests for maybeFormatMessage

test/unit/maybe_format_message.js

@@ -0,0 +1,77 @@
+const test = require('tap').test;
+const maybeFormatMessage = require('../../src/util/maybe-format-message');
+
+const nonMessages = [
+    'hi',
+    42,
+    true,
+    function () {
+        return 'unused';
+    },
+    {
+        a: 1,
+        b: 2
+    },
+    {
+        id: 'almost a message',
+        notDefault: 'but missing the "default" property'
+    },
+    {
+        notId: 'this one is missing the "id" property',
+        default: 'but has "default"'
+    }
+];
+
+const argsQuick = {
+    speed: 'quick'
+};
+
+const argsOther = {
+    speed: 'slow'
+};
+
+const argsEmpty = {};
+
+const simpleMessage = {
+    id: 'test.simpleMessage',
+    default: 'The quick brown fox jumped over the lazy dog.'
+};
+
+const complexMessage = {
+    id: 'test.complexMessage',
+    default: '{speed, select, quick {The quick brown fox jumped over the lazy dog.} other {Too slow, Gobo!}}'
+};
+
+const quickExpectedResult = 'The quick brown fox jumped over the lazy dog.';
+const otherExpectedResult = 'Too slow, Gobo!';
+
+test('preserve non-messages', t => {
+    t.plan(nonMessages.length);
+
+    for (const x of nonMessages) {
+        const result = maybeFormatMessage(x);
+        t.strictSame(x, result);
+    }
+
+    t.end();
+});
+
+test('format messages', t => {
+    const quickResult1 = maybeFormatMessage(simpleMessage);
+    t.strictNotSame(quickResult1, simpleMessage);
+    t.same(quickResult1, quickExpectedResult);
+
+    const quickResult2 = maybeFormatMessage(complexMessage, argsQuick);
+    t.strictNotSame(quickResult2, complexMessage);
+    t.same(quickResult2, quickExpectedResult);
+
+    const otherResult1 = maybeFormatMessage(complexMessage, argsOther);
+    t.strictNotSame(otherResult1, complexMessage);
+    t.same(otherResult1, otherExpectedResult);
+
+    const otherResult2 = maybeFormatMessage(complexMessage, argsEmpty);
+    t.strictNotSame(otherResult2, complexMessage);
+    t.same(otherResult2, otherExpectedResult);
+
+    t.end();
+});