all: rename the gioui.org/ui module to gioui.org

The "ui" is redundant and stutters.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/fling/extrapolation_test.go

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package fling
+
+import "testing"
+
+func TestDecomposeQR(t *testing.T) {
+	A := &matrix{
+		rows: 3, cols: 3,
+		data: []float32{
+			12, 6, -4,
+			-51, 167, 24,
+			4, -68, -41,
+		},
+	}
+	Q, Rt, ok := decomposeQR(A)
+	if !ok {
+		t.Fatal("decomposeQR failed")
+	}
+	R := Rt.transpose()
+	QR := Q.mul(R)
+	if !A.approxEqual(QR) {
+		t.Log("A\n", A)
+		t.Log("Q\n", Q)
+		t.Log("R\n", R)
+		t.Log("QR\n", QR)
+		t.Fatal("Q*R not approximately equal to A")
+	}
+}
+
+func TestFit(t *testing.T) {
+	X := []float32{-1, 0, 1}
+	Y := []float32{2, 0, 2}
+
+	got, ok := polyFit(X, Y)
+	if !ok {
+		t.Fatal("polyFit failed")
+	}
+	want := coefficients{0, 0, 2}
+	if !got.approxEqual(want) {
+		t.Fatalf("polyFit: got %v want %v", got, want)
+	}
+}