- t failing unit test

bash/README.md

@@ -1,4 +1,34 @@
-A pure "function", so this works:
+# Requirements
+
+`bash` and friends (`diff`, `grep`, `cat`)
+
+# (Failing) Unit Test
+
+```shell
+./unit_test.sh
+```
+
+# Texttest Fixture
+
+```shell
+./texttest_fixture.sh
+```
+
+Specify days:
+
+```shell
+./texttest_fixture.sh 30
+```
+
+Verify againt `ThirtyDays/stdout.gr`
+
+```shell
+./verify.sh
+```
+
+## BTW
+
+BTW, the script is a pure "function", so this works:
 
 ```shell
 $ echo -e 'Aged Brie,3,5\nOther Item,4,5' |\
@@ -7,4 +37,4 @@ $ echo -e 'Aged Brie,3,5\nOther Item,4,5' |\
     ./gilded_rose.sh
 Aged Brie,0,8
 Other Item,1,2
-```
+```

bash/unit_test.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+GILDED_ROSE_SCRIPT="./gilded_rose.sh"
+
+get_name() {
+    grep -o '^[^|]*'
+}
+
+assert_equals() {
+    local expected="$1"
+    diff -u - <(echo "$expected")
+}
+
+test_foo() {
+    echo "foo|0|0" |
+        bash "$GILDED_ROSE_SCRIPT" |
+        get_name |
+        assert_equals "fixme"
+}
+
+test_foo

bash/verify.sh

@@ -1,3 +1,6 @@
 #!/bin/bash
 
-./texttest_fixture.sh 30 | diff -u - ../texttests/ThirtyDays/stdout.gr
+./texttest_fixture.sh 30 |
+    diff -u - ../texttests/ThirtyDays/stdout.gr &&
+    echo "✅ looks good" ||
+    (echo "❌ failed" && exit 1)