参考所有分组：补 NURBS source 覆盖，测试通过

test-linuxcnc-rs274-native.sh

@@ -964,6 +964,35 @@ for case in "${binary_operation_error_cases[@]}"; do
     fi
     grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_$fixture.err"
 done
+# Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc
+# convert_nurbs() validates G5.2/G5.3/G6.2 control point, weight, order,
+# knot, mode, and feed requirements before issuing NURBS canon output.
+nurbs_error_cases=(
+    "linuxcnc_g52_missing_y_control_point_error|You must specify both X and Y coordinates for Control Points"
+    "linuxcnc_g52_p_without_xy_after_start_error|Can specify P without X and Y only for the first control point"
+    "linuxcnc_g52_nonpositive_p_error|Must specify positive weight P for every Control Point"
+    "linuxcnc_g52_zero_feed_error|Cannot make a NURBS with 0 feedrate"
+    "linuxcnc_g53_without_g52_error|Cannot use G5.3 without G5.2 first"
+    "linuxcnc_g53_short_control_points_error|You must specify a number of control points at least equal to the order L = 3"
+    "linuxcnc_g62_missing_p_order_error|Program the nurbs order P in the first block of instruction"
+    "linuxcnc_g62_p_non_integer_error|nurbs order P number is not an integer"
+    "linuxcnc_g62_missing_q_mode_error|Program the nurbs Q value (1,2,3) in the first block of nurbs instruction"
+    "linuxcnc_g62_q_out_of_range_error|nurbs Q value not in range 1 to 3"
+    "linuxcnc_g62_q_non_integer_error|nurbs Q number is not an integer"
+    "linuxcnc_g62_k_non_integer_error|nurbs K number is not an integer"
+    "linuxcnc_g62_zero_feed_error|Cannot make a nurbs with 0 feedrate"
+)
+for case in "${nurbs_error_cases[@]}"; do
+    fixture=${case%%|*}
+    expected=${case#*|}
+    if CNC_SIM_RS274_VAR="$var_file" \
+        "$build_dir/linuxcnc_rs274_dump" "tests/gcode/$fixture.ngc" \
+        >"$output_dir/cnc_sim_linuxcnc_$fixture.json" 2>"$output_dir/cnc_sim_linuxcnc_$fixture.err"; then
+        echo "expected $fixture.ngc to fail" >&2
+        exit 1
+    fi
+    grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_$fixture.err"
+done
 cp "$base_var_file" "$var_file"
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_coordinate_offsets.ngc >"$output_dir/cnc_sim_linuxcnc_coordinate_offsets.json"
 cp "$base_var_file" "$var_file"

test-linuxcnc-source-link.sh

@@ -1456,6 +1456,35 @@ if ! grep -q "one plane must be selected for nurbs: XY, YZ, ZX" "$output_dir/cnc
     cat "$output_dir/cnc_sim_linuxcnc_source_g62_extended_plane_error.err" >&2
     exit 1
 fi
+# Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc
+# convert_nurbs() validates G5.2/G5.3/G6.2 control point, weight, order,
+# knot, mode, and feed requirements before issuing NURBS canon output.
+nurbs_error_cases=(
+    "linuxcnc_g52_missing_y_control_point_error|You must specify both X and Y coordinates for Control Points"
+    "linuxcnc_g52_p_without_xy_after_start_error|Can specify P without X and Y only for the first control point"
+    "linuxcnc_g52_nonpositive_p_error|Must specify positive weight P for every Control Point"
+    "linuxcnc_g52_zero_feed_error|Cannot make a NURBS with 0 feedrate"
+    "linuxcnc_g53_without_g52_error|Cannot use G5.3 without G5.2 first"
+    "linuxcnc_g53_short_control_points_error|You must specify a number of control points at least equal to the order L = 3"
+    "linuxcnc_g62_missing_p_order_error|Program the nurbs order P in the first block of instruction"
+    "linuxcnc_g62_p_non_integer_error|nurbs order P number is not an integer"
+    "linuxcnc_g62_missing_q_mode_error|Program the nurbs Q value (1,2,3) in the first block of nurbs instruction"
+    "linuxcnc_g62_q_out_of_range_error|nurbs Q value not in range 1 to 3"
+    "linuxcnc_g62_q_non_integer_error|nurbs Q number is not an integer"
+    "linuxcnc_g62_k_non_integer_error|nurbs K number is not an integer"
+    "linuxcnc_g62_zero_feed_error|Cannot make a nurbs with 0 feedrate"
+)
+for case in "${nurbs_error_cases[@]}"; do
+    fixture=${case%%|*}
+    expected=${case#*|}
+    if CNC_SIM_RS274_VAR="$var_file" \
+        "$build_dir/linuxcnc_rs274_source_dump" "tests/gcode/$fixture.ngc" \
+        >"$output_dir/cnc_sim_linuxcnc_source_$fixture.json" 2>"$output_dir/cnc_sim_linuxcnc_source_$fixture.err"; then
+        echo "expected $fixture.ngc to fail" >&2
+        exit 1
+    fi
+    grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_source_$fixture.err"
+done
 CNC_SIM_RS274_FILE_MODE=1 CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_g76only.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_g76only.json"

tests/gcode/linuxcnc_g52_missing_y_control_point_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G5.2 X1 P1

tests/gcode/linuxcnc_g52_nonpositive_p_error.ngc

@@ -0,0 +1,4 @@
+G21 G90 G17
+F100
+G5.2 X1 Y1 P1
+G5.2 X2 Y2 P0

tests/gcode/linuxcnc_g52_p_without_xy_after_start_error.ngc

@@ -0,0 +1,4 @@
+G21 G90 G17
+F100
+G5.2 X1 Y1 P1
+G5.2 P1

tests/gcode/linuxcnc_g52_zero_feed_error.ngc

@@ -0,0 +1,2 @@
+G21 G90 G17
+G5.2 X1 Y1 P1

tests/gcode/linuxcnc_g53_short_control_points_error.ngc

@@ -0,0 +1,4 @@
+G21 G90 G17
+F100
+G5.2 X1 Y1 P1
+G5.3

tests/gcode/linuxcnc_g53_without_g52_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G5.3

tests/gcode/linuxcnc_g62_k_non_integer_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0.5 P3 Q1

tests/gcode/linuxcnc_g62_missing_p_order_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0 Q1

tests/gcode/linuxcnc_g62_missing_q_mode_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0 P3

tests/gcode/linuxcnc_g62_p_non_integer_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0 P3.5 Q1

tests/gcode/linuxcnc_g62_q_non_integer_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0 P3 Q1.5

tests/gcode/linuxcnc_g62_q_out_of_range_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+F100
+G6.2 X1 Y1 R1 K0 P3 Q4

tests/gcode/linuxcnc_g62_zero_feed_error.ngc

@@ -0,0 +1,2 @@
+G21 G90 G17
+G6.2 X1 Y1 R1 K0 P3 Q1