4 files changed, 92 insertions, 0 deletions
diff --git a/assert.go b/assert.go
new file mode 100644
index 0000000..8a38e9e
--- /dev/null
+++ b/assert.go
@@ -0,0 +1,55 @@
+// package assert contains functions for checking values in unit tests.
+//
+// The functions in this package will log messages and mark tests as failed,
+// not bail out of the test immediately, but rather return a boolean of whether
+// or not the check passed.
+//
+// For analogues which stop the test and lose the boolean return value, see
+// package assert/must.
+package assert
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+// Equal asserts that two values compare as equal.
+func Equal(t testing.TB, actual, expect any) bool {
+	t.Helper()
+	if !cmp.Equal(actual, expect) {
+		t.Errorf(`
+Equal check failed
+------------------
+actual:
+%v
+
+expect:
+%v
+
+diff:
+%s`[1:],
+			actual,
+			expect,
+			cmp.Diff(expect, actual),
+		)
+		return false
+	}
+	return true
+}
+
+// NotEqual asserts that two values compare as unequal.
+func NotEqual(t testing.TB, actual, expect any) bool {
+	t.Helper()
+	if cmp.Equal(actual, expect) {
+		t.Errorf(`
+NotEqual check failed
+---------------------
+value:
+%v`[1:],
+			expect,
+		)
+		return false
+	}
+	return true
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a1c5db6
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module git.tjp.lol/assert
+
+go 1.22.3
+
+require github.com/google/go-cmp v0.6.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..5a8d551
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
diff --git a/must/must.go b/must/must.go
new file mode 100644
index 0000000..67a58dd
--- /dev/null
+++ b/must/must.go
@@ -0,0 +1,30 @@
+// package must contains functions for checking values in unit tests.
+//
+// The functions in this package handle check failures by logging a message
+// containing the relevant values, and aborting the test immediately as failed.
+//
+// For analogues which allow the remainder of the test to run, see package
+// assert.
+package must
+
+import (
+	"testing"
+
+	"git.tjp.lol/assert"
+)
+
+// Equal asserts that two values compare as equal.
+func Equal(t testing.TB, actual, expect any) {
+	t.Helper()
+	if !assert.Equal(t, actual, expect) {
+		t.FailNow()
+	}
+}
+
+// NotEqual asserts that two values compare as unequal.
+func NotEqual(t testing.TB, actual, expect any) {
+	t.Helper()
+	if !assert.NotEqual(t, actual, expect) {
+		t.FailNow()
+	}
+}