diff --git a/src/test/java/g0501_0600/s0558_logical_or_of_two_binary_grids_represented_as_quad_trees/SolutionTest.java b/src/test/java/g0501_0600/s0558_logical_or_of_two_binary_grids_represented_as_quad_trees/SolutionTest.java
index 28fb69e05..35fdd696b 100644
--- a/src/test/java/g0501_0600/s0558_logical_or_of_two_binary_grids_represented_as_quad_trees/SolutionTest.java
+++ b/src/test/java/g0501_0600/s0558_logical_or_of_two_binary_grids_represented_as_quad_trees/SolutionTest.java
@@ -26,4 +26,52 @@ void intersect() {
                 new Solution().intersect(node1, node2).toString(),
                 equalTo("[0,0][1,1][1,1][1,1][1,0]"));
     }
+
+    @Test
+    void intersect2() {
+        Node n1 = new Node(true, true);
+        Node n2 = new Node(true, true);
+        assertThat(new Solution().intersect(n1, n2), equalTo(n1));
+    }
+
+    @Test
+    void intersect3() {
+        Node n1 = new Node(true, true);
+        Node n2 = new Node(false, false);
+        assertThat(new Solution().intersect(n1, n2), equalTo(n1));
+    }
+
+    @Test
+    void intersect4() {
+        Node n1 = new Node(false, false);
+        Node n2 = new Node(true, true);
+        assertThat(new Solution().intersect(n1, n2), equalTo(n2));
+    }
+
+    @Test
+    void intersect5() {
+        Node n1 = new Node(true, false);
+        Node n2 = new Node(true, true);
+        assertThat(new Solution().intersect(n1, n2), equalTo(n2));
+    }
+
+    @Test
+    void intersect6() {
+        Node a = new Node(true, true);
+        Node n1 = new Node(false, false);
+        n1.topLeft = a;
+        n1.topRight = a;
+        n1.bottomLeft = a;
+        n1.bottomRight = a;
+
+        Node n2 = new Node(false, false);
+        n2.topLeft = new Node(true, true);
+        n2.topRight = new Node(true, true);
+        n2.bottomLeft = new Node(true, true);
+        n2.bottomRight = new Node(true, true);
+
+        Node result = new Solution().intersect(n1, n2);
+        assertThat(result.isLeaf, equalTo(true));
+        assertThat(result.val, equalTo(true));
+    }
 }
diff --git a/src/test/java/g0701_0800/s0715_range_module/RangeModuleTest.java b/src/test/java/g0701_0800/s0715_range_module/RangeModuleTest.java
index 33b251b75..0e9d12fe6 100644
--- a/src/test/java/g0701_0800/s0715_range_module/RangeModuleTest.java
+++ b/src/test/java/g0701_0800/s0715_range_module/RangeModuleTest.java
@@ -15,4 +15,87 @@ void solutionTest() {
         assertThat(rangeModule.queryRange(13, 15), equalTo(false));
         assertThat(rangeModule.queryRange(16, 17), equalTo(true));
     }
+
+    @Test
+    void solutionTest2() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(5, 10);
+        rm.addRange(10, 15);
+        assertThat(rm.queryRange(6, 14), equalTo(true));
+    }
+
+    @Test
+    void solutionTest3() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(1, 5);
+        rm.addRange(3, 7);
+        rm.addRange(6, 10);
+        assertThat(rm.queryRange(2, 9), equalTo(true));
+        assertThat(rm.queryRange(0, 2), equalTo(false));
+    }
+
+    @Test
+    void solutionTest4() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(0, 10);
+        rm.removeRange(3, 7);
+        assertThat(rm.queryRange(1, 3), equalTo(true));
+        assertThat(rm.queryRange(7, 9), equalTo(true));
+        assertThat(rm.queryRange(4, 6), equalTo(false));
+    }
+
+    @Test
+    void solutionTest5() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(5, 8);
+        rm.removeRange(0, 20);
+        assertThat(rm.queryRange(5, 7), equalTo(false));
+    }
+
+    @Test
+    void solutionTest6() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(10, 20);
+        rm.removeRange(5, 12);
+        assertThat(rm.queryRange(10, 12), equalTo(false));
+        assertThat(rm.queryRange(12, 15), equalTo(true));
+    }
+
+    @Test
+    void solutionTest7() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(10, 20);
+        rm.removeRange(18, 30);
+        assertThat(rm.queryRange(17, 18), equalTo(true));
+        assertThat(rm.queryRange(18, 19), equalTo(false));
+    }
+
+    @Test
+    void solutionTest8() {
+        RangeModule rm = new RangeModule();
+        rm.removeRange(5, 10);
+        assertThat(rm.queryRange(5, 6), equalTo(false));
+    }
+
+    @Test
+    void solutionTest9() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(5, 7);
+        rm.addRange(10, 12);
+        assertThat(rm.queryRange(6, 7), equalTo(true));
+        assertThat(rm.queryRange(8, 9), equalTo(false));
+        assertThat(rm.queryRange(11, 12), equalTo(true));
+    }
+
+    @Test
+    void solutionTest10() {
+        RangeModule rm = new RangeModule();
+        rm.addRange(1, 5);
+        rm.addRange(10, 15);
+        rm.removeRange(3, 12);
+
+        assertThat(rm.queryRange(2, 3), equalTo(true));
+        assertThat(rm.queryRange(3, 4), equalTo(false));
+        assertThat(rm.queryRange(12, 14), equalTo(true));
+    }
 }
diff --git a/src/test/java/g1501_1600/s1520_maximum_number_of_non_overlapping_substrings/SolutionTest.java b/src/test/java/g1501_1600/s1520_maximum_number_of_non_overlapping_substrings/SolutionTest.java
index 5660871ae..af0189f7b 100644
--- a/src/test/java/g1501_1600/s1520_maximum_number_of_non_overlapping_substrings/SolutionTest.java
+++ b/src/test/java/g1501_1600/s1520_maximum_number_of_non_overlapping_substrings/SolutionTest.java
@@ -4,6 +4,7 @@
 import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.util.Arrays;
+import java.util.Collections;
 import org.junit.jupiter.api.Test;
 
 class SolutionTest {
@@ -20,4 +21,46 @@ void maxNumOfSubstrings2() {
                 new Solution().maxNumOfSubstrings("abbaccd"),
                 equalTo(Arrays.asList("bb", "cc", "d")));
     }
+
+    @Test
+    void maxNumOfSubstrings3() {
+        assertThat(new Solution().maxNumOfSubstrings("a"), equalTo(Arrays.asList("a")));
+    }
+
+    @Test
+    void maxNumOfSubstrings4() {
+        assertThat(new Solution().maxNumOfSubstrings("abc"), equalTo(Arrays.asList("a", "b", "c")));
+    }
+
+    @Test
+    void maxNumOfSubstrings5() {
+        assertThat(new Solution().maxNumOfSubstrings("abac"), equalTo(Arrays.asList("b", "c")));
+    }
+
+    @Test
+    void maxNumOfSubstrings6() {
+        assertThat(new Solution().maxNumOfSubstrings("bba"), equalTo(Arrays.asList("bb", "a")));
+    }
+
+    @Test
+    void maxNumOfSubstrings7() {
+        assertThat(new Solution().maxNumOfSubstrings("abcabc"), equalTo(Arrays.asList("abcabc")));
+    }
+
+    @Test
+    void maxNumOfSubstrings8() {
+        assertThat(new Solution().maxNumOfSubstrings("aaaa"), equalTo(Arrays.asList("aaaa")));
+    }
+
+    @Test
+    void maxNumOfSubstrings9() {
+        assertThat(new Solution().maxNumOfSubstrings(""), equalTo(Collections.emptyList()));
+    }
+
+    @Test
+    void maxNumOfSubstrings10() {
+        assertThat(
+                new Solution().maxNumOfSubstrings("cabcccbaa"),
+                equalTo(Arrays.asList("cabcccbaa")));
+    }
 }
diff --git a/src/test/java/g2501_2600/s2540_minimum_common_value/SolutionTest.java b/src/test/java/g2501_2600/s2540_minimum_common_value/SolutionTest.java
index 0835e3b48..622ab87d6 100644
--- a/src/test/java/g2501_2600/s2540_minimum_common_value/SolutionTest.java
+++ b/src/test/java/g2501_2600/s2540_minimum_common_value/SolutionTest.java
@@ -17,4 +17,52 @@ void getCommon2() {
                 new Solution().getCommon(new int[] {1, 2, 3, 6}, new int[] {2, 3, 4, 5}),
                 equalTo(2));
     }
+
+    @Test
+    void getCommon3() {
+        assertThat(new Solution().getCommon(new int[] {1, 2, 3}, new int[] {4, 5, 6}), equalTo(-1));
+    }
+
+    @Test
+    void getCommon4() {
+        assertThat(
+                new Solution().getCommon(new int[] {1, 3, 5, 7}, new int[] {0, 2, 4, 7}),
+                equalTo(7));
+    }
+
+    @Test
+    void getCommon5() {
+        assertThat(new Solution().getCommon(new int[] {2, 3, 4}, new int[] {2, 5, 6}), equalTo(2));
+    }
+
+    @Test
+    void getCommon6() {
+        assertThat(new Solution().getCommon(new int[] {5}, new int[] {5}), equalTo(5));
+    }
+
+    @Test
+    void getCommon7() {
+        assertThat(new Solution().getCommon(new int[] {5}, new int[] {6}), equalTo(-1));
+    }
+
+    @Test
+    void getCommon8() {
+        assertThat(
+                new Solution().getCommon(new int[] {1, 2, 3, 4}, new int[] {2, 3, 4}), equalTo(2));
+    }
+
+    @Test
+    void getCommon9() {
+        assertThat(new Solution().getCommon(new int[] {1, 2}, new int[] {100, 200}), equalTo(-1));
+    }
+
+    @Test
+    void getCommon10() {
+        assertThat(new Solution().getCommon(new int[] {50, 60}, new int[] {1, 2, 3}), equalTo(-1));
+    }
+
+    @Test
+    void getCommon11() {
+        assertThat(new Solution().getCommon(new int[] {1, 2, 5}, new int[] {3, 4, 6}), equalTo(-1));
+    }
 }
diff --git a/src/test/java/g2901_3000/s2905_find_indices_with_index_and_value_difference_ii/SolutionTest.java b/src/test/java/g2901_3000/s2905_find_indices_with_index_and_value_difference_ii/SolutionTest.java
index f740a9b43..bf9de976b 100644
--- a/src/test/java/g2901_3000/s2905_find_indices_with_index_and_value_difference_ii/SolutionTest.java
+++ b/src/test/java/g2901_3000/s2905_find_indices_with_index_and_value_difference_ii/SolutionTest.java
@@ -23,4 +23,48 @@ void findIndices3() {
         assertThat(
                 new Solution().findIndices(new int[] {1, 2, 3}, 2, 4), equalTo(new int[] {-1, -1}));
     }
+
+    @Test
+    void findIndices4() {
+        int[] big = new int[100000];
+        assertThat(
+                new Solution().findIndices(big, 1, 1_000_000_000),
+                equalTo(new int[] {49998, 50000}));
+    }
+
+    @Test
+    void findIndices5() {
+        int[] big = new int[100001];
+        assertThat(new Solution().findIndices(big, 2, 100000), equalTo(new int[] {-1, -1}));
+    }
+
+    @Test
+    void findIndices6() {
+        int[] big = new int[100001];
+        assertThat(new Solution().findIndices(big, 5, 1_000_000_000), equalTo(new int[] {-1, -1}));
+    }
+
+    @Test
+    void findIndices7() {
+        assertThat(
+                new Solution().findIndices(new int[] {1, 1, 10}, 1, 5), equalTo(new int[] {0, 2}));
+    }
+
+    @Test
+    void findIndices8() {
+        assertThat(
+                new Solution().findIndices(new int[] {7, 7, 7}, 3, 1), equalTo(new int[] {-1, -1}));
+    }
+
+    @Test
+    void findIndices9() {
+        assertThat(
+                new Solution().findIndices(new int[] {9, 3, 5}, 0, 0), equalTo(new int[] {0, 0}));
+    }
+
+    @Test
+    void findIndices10() {
+        assertThat(
+                new Solution().findIndices(new int[] {3, 10, 3}, 1, 7), equalTo(new int[] {0, 1}));
+    }
 }
diff --git a/src/test/java/g3501_3600/s3548_equal_sum_grid_partition_ii/SolutionTest.java b/src/test/java/g3501_3600/s3548_equal_sum_grid_partition_ii/SolutionTest.java
index 424d87bc8..a80e0c66f 100644
--- a/src/test/java/g3501_3600/s3548_equal_sum_grid_partition_ii/SolutionTest.java
+++ b/src/test/java/g3501_3600/s3548_equal_sum_grid_partition_ii/SolutionTest.java
@@ -74,4 +74,69 @@ void canPartitionGrid11() {
                                 new int[][] {{2, 40, 2}, {4, 2, 3}, {5, 1, 6}, {7, 8, 9}}),
                 equalTo(true));
     }
+
+    @Test
+    void canPartitionGrid12() {
+        assertThat(
+                new Solution().canPartitionGrid(new int[][] {{1, 5}, {2, 4}, {3, 3}}),
+                equalTo(false));
+    }
+
+    @Test
+    void canPartitionGrid13() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{1, 1}, {2, 0}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid14() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{5, 2}, {1, 1}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid15() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{4}, {1}, {3}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid16() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{5}, {3}, {2}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid17() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{2, 2, 4}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid18() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{3, 3, 1}}), equalTo(false));
+    }
+
+    @Test
+    void canPartitionGrid19() {
+        int[][] grid = {{100000, 100000}, {100000, 100000}};
+        assertThat(new Solution().canPartitionGrid(grid), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid20() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{1, 2}, {4, 6}}), equalTo(false));
+    }
+
+    @Test
+    void canPartitionGrid21() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{1, 2}, {4, 5}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid22() {
+        assertThat(new Solution().canPartitionGrid(new int[][] {{9, 1, 8}}), equalTo(true));
+    }
+
+    @Test
+    void canPartitionGrid23() {
+        assertThat(
+                new Solution().canPartitionGrid(new int[][] {{2, 2}, {2, 2}, {1, 1}}),
+                equalTo(true));
+    }
 }