add package is

1 files changed, 61 insertions, 0 deletions

diff --git a/is/is_test.go b/is/is_test.go
new file mode 100644
index 0000000..3c6c7db
--- /dev/null
+++ b/is/is_test.go
@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2025 Stefan Majewsky <majewsky@gmx.net>
+// SPDX-License-Identifier: Apache-2.0
+
+package is_test
+
+import (
+	"testing"
+	"time"
+
+	. "github.com/majewsky/gg/internal/test"
+	"github.com/majewsky/gg/is"
+	. "github.com/majewsky/gg/option"
+)
+
+func TestComparable(t *testing.T) {
+	AssertEqual(t, Some("foo").IsSomeAnd(is.EqualTo("foo")), true)
+	AssertEqual(t, Some("bar").IsSomeAnd(is.EqualTo("foo")), false)
+
+	AssertEqual(t, Some("foo").IsSomeAnd(is.DifferentFrom("foo")), false)
+	AssertEqual(t, Some("bar").IsSomeAnd(is.DifferentFrom("foo")), true)
+}
+
+func TestOrdered(t *testing.T) {
+	AssertEqual(t, Some(3).IsSomeAnd(is.Above(4)), false)
+	AssertEqual(t, Some(4).IsSomeAnd(is.Above(4)), false)
+	AssertEqual(t, Some(5).IsSomeAnd(is.Above(4)), true)
+
+	AssertEqual(t, Some(3).IsSomeAnd(is.Below(4)), true)
+	AssertEqual(t, Some(4).IsSomeAnd(is.Below(4)), false)
+	AssertEqual(t, Some(5).IsSomeAnd(is.Below(4)), false)
+
+	AssertEqual(t, Some(3).IsSomeAnd(is.NotAbove(4)), true)
+	AssertEqual(t, Some(4).IsSomeAnd(is.NotAbove(4)), true)
+	AssertEqual(t, Some(5).IsSomeAnd(is.NotAbove(4)), false)
+
+	AssertEqual(t, Some(3).IsSomeAnd(is.NotBelow(4)), false)
+	AssertEqual(t, Some(4).IsSomeAnd(is.NotBelow(4)), true)
+	AssertEqual(t, Some(5).IsSomeAnd(is.NotBelow(4)), true)
+}
+
+func TestTime(t *testing.T) {
+	t1 := time.Now()
+	t2 := t1.Add(time.Second)
+	t3 := t2.Add(time.Second)
+
+	AssertEqual(t, Some(t1).IsSomeAnd(is.After(t2)), false)
+	AssertEqual(t, Some(t2).IsSomeAnd(is.After(t2)), false)
+	AssertEqual(t, Some(t3).IsSomeAnd(is.After(t2)), true)
+
+	AssertEqual(t, Some(t1).IsSomeAnd(is.Before(t2)), true)
+	AssertEqual(t, Some(t2).IsSomeAnd(is.Before(t2)), false)
+	AssertEqual(t, Some(t3).IsSomeAnd(is.Before(t2)), false)
+
+	AssertEqual(t, Some(t1).IsSomeAnd(is.NotAfter(t2)), true)
+	AssertEqual(t, Some(t2).IsSomeAnd(is.NotAfter(t2)), true)
+	AssertEqual(t, Some(t3).IsSomeAnd(is.NotAfter(t2)), false)
+
+	AssertEqual(t, Some(t1).IsSomeAnd(is.NotBefore(t2)), false)
+	AssertEqual(t, Some(t2).IsSomeAnd(is.NotBefore(t2)), true)
+	AssertEqual(t, Some(t3).IsSomeAnd(is.NotBefore(t2)), true)
+}