diff --git a/src/git.xdrm.io/schastsp/lib/context/context_test.go b/src/git.xdrm.io/schastsp/lib/context/context_test.go
new file mode 100644
index 0000000..3111f67
--- /dev/null
+++ b/src/git.xdrm.io/schastsp/lib/context/context_test.go
@@ -0,0 +1,71 @@
+package context
+
+import (
+	"testing"
+)
+
+
+func TestDefaultArguments(t *testing.T) {
+
+	ctx, err := Create(2.2);
+
+	if err != nil {
+		t.Errorf("[Unexpected error]: %s", err);
+		return;
+	}
+	// check all optional arguments
+	if ctx.Window() != 2.2 {
+		t.Errorf("Mismatching window; expected '%f' ; got '%f'", 2.2, ctx.Window())
+		return
+	}
+
+	if ctx.MinDepth() != DefaultMin {
+		t.Errorf("Invalid default value for 'min'; expected '%d' ; got '%d'", DefaultMin, ctx.MinDepth())
+		return
+	}
+
+	if ctx.DepthThreshold() != DefaultThr {
+		t.Errorf("Invalid default value for 'thr'; expected '%d' ; got '%d'", DefaultThr, ctx.DepthThreshold())
+		return
+	}
+
+	if ctx.MaxDepth() != DefaultMax {
+		t.Errorf("Invalid default value for 'max'; expected '%d' ; got '%d'", DefaultMax, ctx.MaxDepth())
+		return
+	}
+
+}
+
+func TestOptionalMinConstraint(t *testing.T) {
+
+	ctx, err := Create(2.2, 0x0f);
+
+	if err != nil {
+		t.Errorf("[Unexpected error]: %s", err);
+		return;
+	}
+
+	ctx, err = Create(2.2, 0x0f-1);
+	if err == nil {
+		t.Errorf("Expected an error with 'min' < %d ; got min=%d", 0x0f, ctx.MinDepth());
+		return;
+	}
+
+}
+
+func TestOptionalMaxConstraint(t *testing.T) {
+
+	ctx, err := Create(2.2, 0xf1, 0x02, 0xf1+0x02+1);
+
+	if err != nil {
+		t.Errorf("[Unexpected error]: %s", err);
+		return;
+	}
+
+	ctx, err = Create(2.2, 0xf1, 0x02, 0xf1+0x02);
+	if err == nil {
+		t.Errorf("Expected an error with 'max' > 'min'+'thr' ; got max=%d, min=%d, thr=%d", ctx.MinDepth(), ctx.MaxDepth(), ctx.DepthThreshold());
+		return;
+	}
+
+}
\ No newline at end of file