diff --git a/attribute/generated_test.go b/attribute/generated_test.go
new file mode 100644
index 0000000..4e8e6db
--- /dev/null
+++ b/attribute/generated_test.go
@@ -0,0 +1,75 @@
+package attribute_test
+
+import (
+    "testing"
+
+    "gitlab.codemonkeysoftware.net/b/hatmill"
+    "gitlab.codemonkeysoftware.net/b/hatmill/attribute"
+)
+
+func testAttribValue(t *testing.T, attrib hatmill.Attrib, expectedValue string) {
+    t.Helper()
+    if attrib.Value != expectedValue {
+        t.Fatalf("expected attribute value to be %#v, but got %#v", expectedValue, attrib.Value)
+    }
+}
+
+func TestSpaceList(t *testing.T) {
+    t.Run("empty", func(t *testing.T) {
+        testAttribValue(t, attribute.Class(), "")
+    })
+    t.Run("nonempty", func(t *testing.T) {
+        testAttribValue(t, attribute.Class("alpha", "bravo", "charlie"), "alpha bravo charlie")
+    })
+}
+
+func TestString(t *testing.T) {
+    const s = "abcdefg"
+    testAttribValue(t, attribute.Id(s), s)
+}
+
+func TestBool(t *testing.T) {
+    testAttribValue(t, attribute.Disabled(), "")
+}
+
+func TestExplicitBool(t *testing.T) {
+    t.Run("true", func(t *testing.T) {
+        testAttribValue(t, attribute.Draggable(true), "true")
+    })
+    t.Run("false", func(t *testing.T) {
+        testAttribValue(t, attribute.Draggable(false), "false")
+    })
+}
+
+func TestInt(t *testing.T) {
+    t.Run("zero", func(t *testing.T) {
+        testAttribValue(t, attribute.Height(0), "0")
+    })
+    t.Run("positive", func(t *testing.T) {
+        testAttribValue(t, attribute.Height(45), "45")
+    })
+    t.Run("negative", func(t *testing.T) {
+        testAttribValue(t, attribute.Tabindex(-45), "-45")
+    })
+}
+
+func TestFloat(t *testing.T) {
+    for _, testcase := range []struct{
+        name string
+        f float32
+        value string
+    } {
+        {name: "zero", f: 0, value: "0"},
+        {name: "integral", f: 45, value: "45"},
+        {name: "positive fractional, small positive exponent", f: 12.55, value: "12.55"},
+        {name: "positive fractional, large positive exponent", f: 1.55E+12, value: "1.55E+12"},
+        {name: "positive fractional, large negative exponent", f: 1.55E-12, value: "1.55E-12"},
+        {name: "negative fractional, small positive exponent", f: -12.55, value: "-12.55"},
+        {name: "negative fractional, large positive exponent", f: -1.55E+12, value: "-1.55E+12"},
+        {name: "negative fractional, large negative exponent", f: -1.55E-12, value: "-1.55E-12"},
+    } {
+        t.Run(testcase.name, func(t *testing.T) {
+            testAttribValue(t, attribute.Min(testcase.f), testcase.value)
+        })
+    }
+}