diff --git a/attribute/generated_test.go b/attribute/generated_test.go
index 4e8e6db..be1a0a5 100644
--- a/attribute/generated_test.go
+++ b/attribute/generated_test.go
@@ -1,75 +1,75 @@
 package attribute_test
 
 import (
-    "testing"
+	"testing"
 
-    "gitlab.codemonkeysoftware.net/b/hatmill"
-    "gitlab.codemonkeysoftware.net/b/hatmill/attribute"
+	"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)
-    }
+	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")
-    })
+	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)
+	const s = "abcdefg"
+	testAttribValue(t, attribute.Id(s), s)
 }
 
 func TestBool(t *testing.T) {
-    testAttribValue(t, attribute.Disabled(), "")
+	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")
-    })
+	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")
-    })
+	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)
-        })
-    }
+	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)
+		})
+	}
 }