1 files changed, 96 insertions, 0 deletions
diff --git a/flags/tests/unknown.ts b/flags/tests/unknown.ts
new file mode 100755
index 000000000..d7c9db8d7
--- /dev/null
+++ b/flags/tests/unknown.ts
@@ -0,0 +1,96 @@
+import { test, assertEqual } from "https://deno.land/x/testing/testing.ts";
+import parseArgs from "../index.ts";
+
+test(function booleanAndAliasIsNotUnknown() {
+    const unknown = [];
+    function unknownFn(arg) {
+        unknown.push(arg);
+        return false;
+    }
+    const aliased = [ '-h', 'true', '--derp', 'true' ];
+    const regular = [ '--herp',  'true', '-d', 'true' ];
+    const opts = {
+        alias: { h: 'herp' },
+        boolean: 'h',
+        unknown: unknownFn
+    };
+    const aliasedArgv = parseArgs(aliased, opts);
+    const propertyArgv = parseArgs(regular, opts);
+
+    assertEqual(unknown, ['--derp', '-d']);
+});
+
+test(function flagBooleanTrueAnyDoubleHyphenArgumentIsNotUnknown() {
+    const unknown = [];
+    function unknownFn(arg) {
+        unknown.push(arg);
+        return false;
+    }
+    const argv = parseArgs(['--honk', '--tacos=good', 'cow', '-p', '55'], {
+        boolean: true,
+        unknown: unknownFn
+    });
+    assertEqual(unknown, ['--tacos=good', 'cow', '-p']);
+    assertEqual(argv, {
+        honk: true,
+        _: []
+    });
+});
+
+test(function stringAndAliasIsNotUnkown() {
+    const unknown = [];
+    function unknownFn(arg) {
+        unknown.push(arg);
+        return false;
+    }
+    const aliased = [ '-h', 'hello', '--derp', 'goodbye' ];
+    const regular = [ '--herp',  'hello', '-d', 'moon' ];
+    const opts = {
+        alias: { h: 'herp' },
+        string: 'h',
+        unknown: unknownFn
+    };
+    const aliasedArgv = parseArgs(aliased, opts);
+    const propertyArgv = parseArgs(regular, opts);
+
+    assertEqual(unknown, ['--derp', '-d']);
+});
+
+test(function defaultAndAliasIsNotUnknown() {
+    const unknown = [];
+    function unknownFn(arg) {
+        unknown.push(arg);
+        return false;
+    }
+    const aliased = [ '-h', 'hello' ];
+    const regular = [ '--herp',  'hello' ];
+    const opts = {
+        default: { 'h': 'bar' },
+        alias: { 'h': 'herp' },
+        unknown: unknownFn
+    };
+    const aliasedArgv = parseArgs(aliased, opts);
+    const propertyArgv = parseArgs(regular, opts);
+
+    assertEqual(unknown, []);
+});
+
+test(function valueFollowingDoubleHyphenIsNotUnknown() {
+    const unknown = [];
+    function unknownFn(arg) {
+        unknown.push(arg);
+        return false;
+    }
+    const aliased = [ '--bad', '--', 'good', 'arg' ];
+    const opts = {
+        '--': true,
+        unknown: unknownFn
+    };
+    const argv = parseArgs(aliased, opts);
+
+    assertEqual(unknown, ['--bad']);
+    assertEqual(argv, {
+        '--': ['good', 'arg'],
+        '_': []
+    })
+});